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Apple Power MAC G5 Manual

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Apple Power MAC G5Apple Power Mac - G5 - 512 MB RAM - 2 GHz - 160 GB HDD

Tower, Apple MacOS X 10.3, NVIDIA GeForce FX 5200 Ultra, 1 MB cache - Monitor: .

The creative class needs superior tools to produce designs, music, high-definition video or the next scientific breakthrough. The new Power Mac G5 line spans as far as you require. Its dual 64-bit G5 processors, room for up to 8GB of main memory, 8X SuperDrive and ultrahigh-bandwidth system architecture will give you more results than systems costing twice as much.
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Comments to date: 10. Page 1 of 1. Average Rating:
basshead 1:48am on Saturday, October 23rd, 2010 
Blisteringly fast! Much faster than a 3-GHz Pentium 4 Usually quiet, but when processors are taxed fans are loud. It Will Not Run ANY Viruses or Spyware: Incredibly FAST!! More than your Average Consumer wants to Pay for Top Quality
Colorado6202 6:11am on Thursday, September 23rd, 2010 
one of the computers in the world Originally I was going to buy a PowerPC based iMac with the built in iSight camera but I got this instead along with...
pot1906dk 3:51pm on Friday, September 17th, 2010 
This is a practical review may be very useful to get the best computer for you. >> able to guide for beginners >> review 1 Please be. This is a practical review may be very useful to get the best computer for you. Plea se be, Apple Power Mac G5 Dual - PPC G5 2.
curly_joe 7:49am on Tuesday, September 7th, 2010 
Windows OS is very unpleasant after using Apple OS. This machine is a dream to use. Most things happen instantly with little perception of delay. Beside a card reader what expansion concerns do you have?
indianosr 1:19am on Saturday, August 21st, 2010 
Better account of the trend Apple overprice, under configure, and at least support office, including top-of-the-line Apple Power Mac G5 Dual 2.
wisser 4:41pm on Thursday, July 22nd, 2010 
I just recieved mine this past thursday. It is a beast of a machine. I have 2 gigs of ram and the 7800 GT vid card. I love the OS stability. Great graphics . Apple needs to lower the profit margin and get competitive with high end PCs...
cheviot 5:31pm on Wednesday, June 2nd, 2010 
Pimpable Still worth a look, but only if the price is very much right. Ram, hard drives, graphics cards and displays are all cheap now. one of the computers in the world Originally I was going to buy a PowerPC based iMac with the built in iSight camera but I got this instead along with... Powerful for designers I bought this Mac and a 20 inch flat screen for my print design business.
Marco Siebeneichler 2:38pm on Tuesday, June 1st, 2010 
I purchased this computer used to replace my Mac Mini 1.42GHz G4. This is a huge upgrade. The 64 bit processor makes easy work out of 10.4.10.
Asamat 11:34am on Tuesday, June 1st, 2010 
but can run the powerpc apps fastand It kicks...  can run final cut pro 3 fast on the 2.7ghz model not an intel I was so thrilled for the first time when I g...  Stable and fast but, components get damaged without an Online UPS also other complications
MixMusic_ 9:37am on Thursday, May 27th, 2010 
I started working with PCs and MicroSoft software before "Windows," but when I saw Vista, I knew... GREAT OS (10.5), NO virus, adware. I started working with PCs and MicroSoft soft...  GREAT OS (10.5), NO virus, adware, malware problems !!!

Comments posted on are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.




PCI Express slots Connect your choice of 16-lane PCI Express graphics cards to one or two displays, and install up to three PCI Express expansion cards to add cutting-edge devices to your Power Mac G5 system.
Dual Gigabit Ethernet ports Two Gigabit (10/100/1000BASE-T) Ethernet interfaces allow you to connect the Power Mac G5 to both a public and a private networkideal, for example, for simultaneous access to the Internet and an Xsan network. Dual Gigabit Ethernet also enables server-class features such as support for VLAN tags, jumbo frames, and port aggregation.
SuperDrive Read and write to most types of CD and DVD media using the built-in 16x SuperDrive with double-layer support.
Antenna for wireless connections A built-in antenna and optional AirPort Extreme3 and Bluetooth technologies make wireless networking easy. Create or join AirPort wireless networks, exchange les wirelessly with another AirPort-equipped Mac, or connect to Bluetooth-enabled mobile phones, PDAs, and printers and to Apples wireless keyboard and mouse.
Analog and optical digital audio Optical digital audio ports support stereo and 5.1 surround sound speaker systems, while analog stereo audio line-level input and output ports allow you to connect analog audio decks and devices.
FireWire and USB 2.0 ports Plug in your choice of peripherals and devices. Each system has one FireWire 400 port on the front, one FireWire 400 port on the back, a FireWire 800 port on the back, and four USB 2.0 portsone on the front and three on the back. There are also two USB 1.1 ports on the keyboard.
Convenient front I/O ports The front panel of the Power Mac G5 features an integrated speaker, headphone minijack, FireWire port, USB 2.0 port, and power button.

Quad-Core Processing

Enter the dual-core PowerPC G5 processor: one silicon chip with two independent processor cores. Now take two of those dual-core chips and you have the Power Mac G5 Quad, for groundbreaking quad-core processing. Quad-core processing means more 64-bit resources: more L2 cache, more Velocity Engine units, and more double-precision oating-point units. Videographers can edit more footage, lmmakers can produce more real-time eects, designers and photographers can process more higher-resolution images, and researchers can crunch through data sets for faster results. Compare a quad-core Power Mac G5 to the fastest dual-processor G5 ever built, and youll experience up to 69 percent faster performance running popular professional applications.1

With two independent cores on one processor, the new PowerPC G5 packs tremendous processing power on a single chip.
Two Dual-Core PowerPC G5 Processors
The new PowerPC G5 combines two processor cores on a single silicon chip, providing double the computational power in the same space as a single-core processor. Whats more, each core has its own 1MB of L2 cache memorydouble the size of its predecessorso youll have ultrafast access to twice the amount of frequently used data. With two dual-core PowerPC G5 processors, the Power Mac G5 Quad doubles the ante. Applications can take advantage of four 64-bit processor cores, including four 1MB L2 caches, four 128-bit Velocity Engine units, and eight double-precision oating-point units, for a radical increase in desktop performance. Comparison of PowerPC G4, single-core PowerPC G5, and dual-core PowerPC G5 processors
PowerPC G4 Architecture Addressable memory Frontside bus Processor cores Velocity Engine units Floating-point units Integer units L1 data cache L1 instruction cache L2 cache 32-bit 4 gigabytes Single One One One One 32K 32K 256K Single-core PowerPC G5 64-bit 4 terabytes Dual One One Two Two 32K 64K 512K Dual-core PowerPC G5 64-bit 4 terabytes Dual Two Two Four Four Two sets of 32K Two sets of 64K Two sets of 1MB
Bidirectional Frontside Bus
Leveraging the dual frontside bus architecture pioneered in the original Power Mac G5, each dual-core processor has an independent data path to the system controller running at up to 1.25GHz. Unlike conventional processor interfaces, which carry data in only one direction at a time, this dual-channel frontside bus has two 32-bit pointto-point links (64 bits total): One link travels into the processor and another travels from the processor, which means no wait time while the processor and the system controller negotiate which will use the bus or while the bus switches direction. This enables data to move in opposite directions simultaneouslya dramatic improvement over previous processor interfaces.
In Power Mac G5 Quad systems, each dual-core PowerPC G5 processor has its own bidirectional frontside bus.
In Power Mac G5 Quad systems, each processor has its own bidirectional interface to the system controller, unlike traditional dual-processor systems, which constrain throughput by placing all processor resources on one bus. Each G5 processor has a dedicated interface to main memory for total bandwidth of up to 10 GBps per processor, or a total of 20 GBps for a quad system. This high-performance frontside bus architecture also enables each core to discover and access data in the other cores cachesfurther increasing performance on quad-core systems.
64-Bit Processor Architecture
The dual-core PowerPC G5 joins forces with Mac OS X v10.4 Tiger to enable 64-bit computation, including the ability to address vast amounts of main memory and to perform double-precision oating-point calculations. Support for massive amounts of memory The move to 64-bit processors results in a dramatic leap in the amount of memory supported. In practice, memory addressing is dened by the physical address space of the processor. The PowerPC G5, with 42 bits of physical address space, supports a colossal 242 bytes, or 4 terabytes (4TB), of system memory. Although its not currently feasible to purchase 4TB of RAM, the advanced architecture of this processor allows for plenty of growth in the future. More practical and still far more than a typical PC, the Power Mac G5 can be congured with 16GB of addressable memory. Such large quantities of memory enable the system to contain a complex 3D model, massive digital images, a scientic simulation, or a sequence of video entirely in RAM. When data is stored in memory, the processor can access it 40 times faster than from the hard drive, drastically reducing the time to manipulate, modify, and render the data and making it feasible to tackle gigantic projects on a desktop system. 64-bit computation power The other advantage provided by the 64-bit PowerPC G5 is the ability to perform multiple simultaneous 64-bit oating-point and integer calculations. The PowerPC G5 features full 64-bit data paths and data registers, allowing it to express the extreme precision needed for oating-point mathematics and to express integers up to 18 billion billion. By contrast, a 32-bit processor must break these types of computations into multiple piecesrequiring multiple passes through the processor and slowing down application performance.

Eight Double-Precision Floating-Point Units
Linpack A measure of a computers oating-point execution performance, the Linpack benchmark solves a dense system of linear equations. The Power Mac G5 Quad executed the double-precision equations 88 percent faster than the dual 2.7GHz Power Mac G5 and an amazing 626 percent faster than the dual 1.42GHz Power Mac G4.
Power Mac G5 Quad 2.5GHz Dual 2.7GHz Power Mac G5 Dual 1.42GHz Power Mac G4 2.9 gigaops 11.1 gigaops 21 gigaops
The PowerPC G5 core contains two double-precision oating-point units, each capable of performing a multiply and an add at the same time. This means a Power Mac G5 Quad, with four processor cores and a total of eight oating-point units, can complete up to sixteen 64-bit oating-point operations in a single cycle. Such immense 64-bit computational power accelerates applications in many elds, including audio creation, 3D content creation, and scientic visualization and analysis resulting in performance levels far beyond those of previous Power Mac generations. Fused multiply-add example The oating-point units in the PowerPC G5 can complete both a multiply and an add operation as part of the same machine instructionaccelerating matrix multiplication, vector dot products, and other scientic computations. Referred to as fused multiplyadd, or fmadd, this instruction is considered a building block for data-intensive oating-point computation. The following computation can be completed by a fused multiply-add instruction in one pass through either of the two oating-point units in a PowerPC G5 core: T = (a * b) + c On other processors, two instructions are required. The rst is a multiply instruction: U = (a * b) The product U is used by a second instruction, an addition, to complete the computation: V=U+c In processors with comparable clock speeds, the computation of (a * b) + c is completed twice as fast using fused multiply-add. It also delivers a more accurate result, because round-o occurs just once in the computation of Twhile on other processors, round-o occurs twice: in the computation of U and in the computation of V.
Four Velocity Engine Units
Gigaops The gigaops test indicates a systems vector processing capability by measuring the maximum number of oating-point operations it can perform. With four Velocity Engine units, the Power Mac G5 Quad completed the test 85 percent faster than the dual 2.7GHz Power Mac G5 and 260 percent faster than the dual 1.42GHz Power Mac G4.
Power Mac G5 Quad 2.5GHz Dual 2.7GHz Power Mac G5 Dual 1.42GHz Power Mac G4 21.3 gigaops 76.6 gigaops 41.1 gigaops
A dual-pipelined Velocity Engine in each processor core is optimized with two independent queues and dedicated 128-bit registers and data paths for ecient instruction and data ow. This 128-bit vector processing unit accelerates data manipulation by applying a single instruction to multiple data at the same time, known as SIMD processing. Originally implemented in the PowerPC G4, the Velocity Engine in the PowerPC G5 uses the same set of 162 instructions, enabling it to accelerate existing Mac OS X applications that have been optimized for the Velocity Engine. Vector processing is useful for transforming large sets of data, such as manipulating an image or rendering a video eect. For example, when a designer uses a lter to apply a motion blur to an image, each pixel of the image must be changed according to the same set of instructionsa highly repetitive processing task. Each Velocity Engine pipeline speeds up this task by processing up to 128 bits of data, in four 32-bit integers, eight 16-bit integers, sixteen 8-bit integers, or four 32-bit single-precision oating-point values, in a single clock cycle. That works out to 16 simultaneous 32-bit oating-point operations on a Power Mac G5 Quad.

Multiple Cores and Mac OS X
Mac OS X is ideally suited to leverage the power of quad-core systems, since it was designed from day one for multiple processors. With symmetric multiprocessing, preemptive multitasking, and multithreading capabilities in Mac OS X, a Power Mac G5 Quad delivers groundbreaking performance. Symmetric multiprocessing (SMP) in Mac OS X dynamically manages tasks across multiple processorsand multiple processor coreswithout requiring any special optimization of the application or any special action on the users part. With SMP, you can run a processor-intensive task in the background while you work with another application. Mac OS X assigns each of these tasks to a dierent processor or core, allowing the tasks to execute simultaneously, and automatically balances the load between processors. Preemptive multitasking further optimizes performance by allowing Mac OS X to prioritize tasks on each processor or core. Applications can take even greater advantage of multiple cores when they are written to generate multiple threads (or self-contained tasks), known as multithreading. Many of todays applications are multithreaded, achieving up to 69 percent faster performance on a Power Mac G5 Quad right out of the box.1 As a user, you dont need to worry about symmetric multiprocessing or application threadingyoull just enjoy the enhanced performance.
The Power Mac G5 comes with Mac OS X v10.4 Tiger, Apples UNIX-based operating system, including powerful new features such as Spotlight, Dashboard, and Automator.

PCI Express Architecture

The new Power Mac G5 introduces a modern PCI Express architecture to the Mac platform, opening up a world of high-performance system technologies and peripherals. PCI Express paves the way for emerging solutions for media and networking, making it a future-savvy choice for your lab or studio. Built into the Power Mac G5 architecture is an all-new system controller. This fast application-specic integrated circuit (ASIC) integrates a new lower-latency memory subsystem with support for ultrafast DDR2 main memoryplus 16-lane PCI Express graphics and the dual-channel, bidirectional frontside bus that made its debut in the original Power Mac G5.

Dual-core PowerPC G5 processors Dual bidirectional frontside buses System controller 533MHz DDR2 memory PCI Express graphics

PCI Express expansion

Dual Gigabit Ethernet
SuperDrive with double-layer support

Serial ATA storage

High-performance I/O

533MHz DDR2 Main Memory

Up to 25 percent faster memory throughput With support for DDR2 memory, data throughput on the new Power Mac G5 is 25 percent faster than previous Power Mac G5 models and up to three times faster than the Power Mac G4.
128-bit DDR2 at 533MHz 128-bit DDR at 400MHz 64-bit DDR at 333MHz 2.7 GBps 8.5 GBps 6.4 GBps
The new 128-bit memory controller in the Power Mac G5 supports DDR2 main memory running at speeds up to 533MHz. In addition to writing data at a double rate, or twice the rate of the clock speed, the memory controller increases eciency by reordering read and write operations. By addressing two banks of SDRAM at the same time, the new Power Mac G5 can reach a memory throughput of up to 8.5 GBps. That represents a 25 percent increase over the latest Power Mac G5 and triple the throughput of the fastest Power Mac G4. With its 64-bit processor architecture, the Power Mac G5 can address more memory than any previous Macintosh and many desktop PCs. All Power Mac G5 systems can hold up to eight 2GB DIMMs for up to 16GB of memory. For users in mission-critical and compute-intensive environments, theres also the option of ECC (Error Correction Code) main memory, which allows automatic correction of single-bit errors and detection of multiple-bit errors. This high-speed, high-capacity memory architecture enables graphics, video, audio, and scientic applications to run radically faster. Enormous les and data sets can be loaded into RAM for rapid access by the PowerPC G5without having to access system storage. Data can be retrieved from memory 40 times faster than from the hard drive. In fact, accessing the rst critical word of data from memory is 60,000 times faster than from a hard drive, so manipulation and analysis of data can be performed at remarkable speeds.

PCI Express Graphics

Almost twice the graphics throughput The 16-lane PCI Express graphics interface increases throughput to up to 4 GBps, almost double that of AGP 8X in previous Power Mac G5 models.
16-lane PCI Express AGP 8X 2.1 GBps 4 GBps
With the introduction of PCI Express architecture comes a new 16-lane PCI Express graphics interface that supports the latest graphics controllers and delivers up to 4 GBps of data throughput. By supplying up to 150 watts of power to the primary graphics processing unit, the new Power Mac G5 provides the headroom for highperformance, next-generation graphics processors and applications, enabling even higher resolutions for stunning realism. For more information about graphics cards, Apple displays, and graphics technologies, see the Workstation Graphics section.

PCI Express Expansion

Up to twice the PCI throughput PCI Express delivers a radical increase in throughput compared with the expansion technologies on previous Power Mac G5 systems (PCI-X and PCI) and Power Mac G4 systems (PCI).
Eight-lane PCI Express Four-lane PCI Express PCI-X 64-bit, 133MHz PCI 64-bit, 33MHz 0.25 GBps 1 GBps 1 GBps 2 GBps
The all-new PCI Express architecture allows you to customize your Power Mac G5 to the needs of your workowproviding tremendous power and productivity in a single system. As your needs change, youll have the exibility to add solutions for emerging workow scenarios, such as HD video and next-generation networking. Modern serial expansion architecture PCI Express is a modern industry standard sponsored by the Peripheral Component Interconnect Special Interest Group (PCI SIG). Because older parallel technologies placed multiple devices on a single bus, the slowest device determined the speed of the entire bus. A serial technology, PCI Express guarantees each device dedicated bandwidth to and from the system controller. PCI Express communicates in 250-MBps data lanes. PCI Express cards and slots are dened by their bandwidth, or number of data lanestypically one lane, four lanes, eight lanes, or 16 lanes. At 250 MBps per lane, a four-lane slot can transfer data at up to 1 GBps and an eight-lane slot, up to 2 GBpsapproximately twice as fast as a 133MHz PCI-X slot.
Three expansion slots In addition to the 16-lane graphics slot, the Power Mac G5 features three PCI Express expansion slots: two four-lane slots and one eight-lane slot. Each slot uses a standard connector that can accommodate a card of any size. This means a four-lane card works perfectly in an eight-lane slot. If the card has more lanes than the slot, the card adjusts to the bandwidth available and downshifts to that data rate. With the high-bandwidth architecture in the new Power Mac G5, your system not only will achieve faster performance today, but will be ready for future technologies as well. For example, 10-gigabit networking technology, which can achieve up to 2.5 GBps of data throughput, will require an eight-lane slot. This promises to be an ideal solution for working with uncompressed HD video, which demands over 120 MBps per individual streamand far more in a multiple-stream or multiple-camera environment.
Each Power Mac G5 system includes four PCI Express slots.
Support for up to eight displays Because both graphics and expansion slots use the same PCI Express standard, you can install a PCI Express graphics card in any PCI Express slot. That means a single Power Mac G5 can support four, six, or even eight displays with the addition of multiple NVIDIA GeForce 6600 graphics cards.

Two independently congurable 10/100/1000BASE-T (Gigabit) Ethernet interfaces deliver tremendous networking bandwidth. Each Gigabit Ethernet controller in the new Power Mac G5 supports jumbo frames (packets of up to 9000 bytes), reducing system overhead and increasing throughput for all network activities. Virtual LAN tags (VLAN 802.1q) allow the Power Mac G5 to join multiple virtual networks, with a unique identication for each one. And with Ethernet link aggregation in Mac OS X, you can combine the bandwidth of the interfaces for doubled performance. Dual Gigabit Ethernet delivers the massive throughput required for many professional networking needs. Youll be able to support an isolated management network thats independent of a client services network, work in a SAN environment that requires independent networks for metadata and general networking, or provide the highspeed network interconnect required in many cluster computing environments.

High-Performance I/O

The Power Mac G5 architecture uses the HyperTransport protocol to integrate I/O subsystems and connect them to the system controller. Serial ATA, FireWire, USB, audio, and wireless technologies are integrated through two bidirectional 800MHz HyperTransport interconnects for a maximum throughput of 1.6 GBps, providing ample throughput for a host of peripheral devices. Serial ATA storage Serial ATA is the industry-standard storage interface, replacing the Parallel ATA interface. Designed to keep pace with the demands of digital video creation and editing, audio storage and playback, and other data-intensive applications, Serial ATA supports 1.5-Gbps throughput per channel (equivalent to a data rate of 150 MBps). The Power Mac G5 can hold two internal 500GB Serial ATA drives for a total capacity of 1TB of storage.2 Each drive is on an independent bus, so theres no competition for drive performance as with Parallel ATA. Performance is improved even further when drives are striped using software RAID in Mac OS X.
FireWire and USB 2.0 One of the most versatile standards ever developed, FireWire makes it easy to connect high-bandwidth devices such as DV cameras, hard drives, and high-performance imaging peripherals. And since FireWire cables carry power, the Power Mac G5 can recharge a portable devices batteries, even while its in use. FireWire 800 doubles the throughput of the original FireWire 400, from 400 to 800 Mbps.4 The FireWire 800 port can also connect to FireWire 400 devices using the appropriate 9-pin-to-6-pin or 9-pin-to-4-pin cable. Whats more, FireWire 800 works over distances of up to 100 metersperfect for remote devices. USB ports allow you to connect printers, scanners, graphics tablets, keyboards, microphones, iPod players, speakers, joysticks, and other industry-standard input and output devices. Each system has one FireWire 400 port on the front, one FireWire 400 port on the back, a FireWire 800 port on the back, and four USB 2.0 portsone on the front and three on the backplus two USB 1.1 ports on the keyboard. Wireless connections For wireless communications, an antenna is built into the Power Mac G5just add optional AirPort Extreme and Bluetooth technologies. AirPort Extreme allows you to create an ad hoc network, share les with a wireless-enabled portable computer, or stream music to your stereo using an AirPort Express Base Station.3 Bluetooth 2.0 + EDR (Enhanced Data Rate) allows short-range wireless connectionsat data rates up to 3 Mbpsto a variety of Bluetooth-enabled digital devices, such as cell phones, personal digital assistants, printers, and Apples wireless keyboard and mouse. You can even synchronize contacts between Bluetooth-equipped cell phones, PDAs, and Mac OS X Address Book. For more information, see and SuperDrive with double-layer support The SuperDrive built into every Power Mac G5 reads and writes to a wide variety of DVD and CD media, including double-layer (DVD+R DL) discs capable of holding up to 8.5GB of data.

The NVIDIA Quadro FX 4500 features two dual-link DVI ports, a stereo 3D port, and a large 512MB GDDR3 frame buffer for realistic and hyper-responsive graphics.
Your ideas are transformed into reality when you add oneor severalcrystal-clear Apple Cinema Displays to your Power Mac G5. This family of widescreen LCD displays delivers impressive image quality, enabling an all-digital, color-managed workow not available on other platforms.
Advanced Graphics Options
With the introduction of PCI Express architecture comes a new lineup of 16-lane PCI Express graphics cards for the Power Mac G5. Choose a standard conguration equipped with a card for general graphics applicationsor upgrade to a high-performance card for ultraresponsive graphics and true onscreen stereo 3D, perfect for scientic visualization and 3D design. NVIDIA GeForce 6600 LE and GeForce 6600 Standard Power Mac G5 congurations come with the GeForce 6600 LE or the GeForce 6600 from NVIDIA. These cards provide excellent all-around performance for creative applications and oce productivity. NVIDIA GeForce 7800 GT If you need higher performance for motion graphics, animation, and 3D design and visualization, youll likely want to upgrade to the NVIDIA GeForce 7800 GT. Designed to accelerate the latest creative applications and blockbuster games, the 7800 GT has a large 256MB frame buer and very fast GDDR3 (Graphics Double Data Rate 3) SDRAM.
16-lane PCI Express The 16-lane PCI Express graphics interface provides throughput of up to 4 GBps, almost double that of the AGP 8X standard. And by supplying up to 150 watts of power to the primary graphics processing unit, the new Power Mac G5 provides the headroom for high-performance, next-generation graphics processors and applicationsenabling even higher resolutions for stunning realism.
NVIDIA Quadro FX 4500 If industrial-strength 3D design work, stereo 3D visualization, or using two 30-inch Apple Cinema HD Displays is at the top of your wish list, you can congure your Power Mac G5 with the NVIDIA Quadro FX 4500.7 One of the most sophisticated graphics cards available, the Quadro FX 4500 is an ideal choice for advanced design and visualization. It features: An integrated stereo 3D port, so scientists can use goggles for stereo-in-a-window visualization applications6 Hardware support for anti-aliased points and lines, accelerated clip planes, and two-sided lighting Two dual-link DVI ports for connecting two 30-inch Apple Cinema HD Displays, delivering the largest workspace available using a single graphics card Graphics card specications
GeForce 6600 LE Card interface Memory interface Frame buer memory Memory bandwidth Vertices per second Fill rate (texels per second) Ports 16-lane PCI Express 128-bit 128MB GDDR SDRAM 6.4 GBps 225 million 1.2 billion One single-link DVI and one dual-link DVI One GeForce 6600 16-lane PCI Express 128-bit 256MB GDDR SDRAM 8 GBps 225 million 2.4 billion One single-link DVI and one dual-link DVI One GeForce 7800 GT Quadro FX 4500 16-lane PCI Express 16-lane PCI Express 256-bit 256MB GDDR3 SDRAM 32 GBps 700 million 8 billion One single-link DVI and one dual-link DVI One 256-bit 512MB GDDR3 SDRAM 33.6 GBps 181 million triangles 10.8 billion Two dual-link DVI and one stereo port Two

Slots occupied

Choosing a graphics card Which card is right for you? More powerful graphics processors and faster, larger frame buers perform 2D and 3D operations more quickly. When selecting a graphics card, consider your primary uses, along with the following: Memory bandwidth determines how fast images and textures can be accessed by the graphics processor from its own memory. The higher the bandwidth, the more capable the card is of supporting real-time, complex 3D images. Vertices are the key building blocks for 3D images in the OpenGL graphics environment in Mac OS X. More vertices means greater complexity, resulting in more realism onscreen. After a 3D object is assembled from the vertices, it must be lled. Each 3D object can contain many pixels, each with a dierent appearance based on the texture, lighting, and color being applied. The higher the ll rate, the more lifelike an object appears. Frame buer memory, or video memory, stores the information being used by the graphics processor to create onscreen images. The faster the memory, the more capable the graphics card is of generating lifelike, complex 3D screens in real time. For best performance, choose GDDR3 memory, developed by the graphics industry for intensive 3D applications. Note that larger frame buers also improve support for a multiple-display conguration in which large, complex screens are created for both displays.
All Power Mac G5 cards support two displays: one 20- or 23-inch Apple Cinema Display and one 30-inch Apple Cinema HD Display. If you want to connect your Power Mac G5 to two 30-inch Apple Cinema HD Displaysor use stereo 3D goggleschoose the workstation-class NVIDIA Quadro FX 4500. If you plan to install as many as three PCI Express cards in your Power Mac G5, youll want to consider cards that occupy a single slot. Graphics performance Each of the graphics card options available for the new Power Mac G5 provides excellent support for 2D and 3D operations in applications such as Motion and in games such as Halo. Motion graphics. Motion, Apples motion graphics design application, leverages the graphics processor to animate eects onscreen in real time. The test protocol measured the uncached playback, cached playback, and export to QuickTime of three projects: a lter test, an HDV green screen matte, and a particle eects test. Motion 2 results Visual eects rendering

NVIDIA Quadro FX 4500

Core Image in Mac OS X Built into Mac OS X, Core Image is an advanced image-processing technology that leverages the graphics processor for blistering-fast rendering performance. Eects and transitions can be expressed with a few lines of code. Core Image handles the rest, optimizing the path to the graphics processor. The result is real-time response as you select and apply lters.

74% faster 68% faster Baseline Percent faster than the previous model

NVIDIA GeForce 7800 GT


NVIDIA GeForce 6600

The Power Mac G5 Quad congured with the NVIDIA Quadro FX 4500 was 74 percent faster than the same system congured with the NVIDIA GeForce 6600.*
3D gaming. 3D gaming involves realistic visualizations and rapid movements that require maximum processor performance and top-of-the-line graphics capabilities all with more complexity and better texturing than ever before. Frame rates were measured using the game Halo, one of the most popular gaming titles on the market, which leverages the programmability features of the graphics card. Halo results 1024-by-768 resolution, 32-bit color
90% faster 84% faster Baseline Percent faster than the previous model
The Power Mac G5 Quad congured with the NVIDIA Quadro FX 4500 was 90 percent faster than the same system congured with the NVIDIA GeForce 6600.*
* Testing conducted by Apple in September 2005 using preproduction 2.5GHz Power Mac G5 Quad units. Motion tests included a mix of particle eects, green screen compositing, and lter eects. Halo 1.5.2 was tested using the Time Demo benchmark with advanced pixel shaders.

Apple Cinema Displays

Featuring a compact footprint and elegant aluminum design, an Apple Cinema Display is the perfect match for your new Power Mac G5. The DVI interface transfers pure digital signals from computer to display, and each display includes two USB 2.0 and two FireWire 400 ports for connecting devices. You can even add an iSight camera to the top of the display using a sleek magnetic mount.
Certied by SWOP SWOP, the organization that sets Specications for Web Oset Printing, has certied the Apple Cinema Display for virtual color proong. This means you can check color onscreen, without the wasted time and expense of producing and delivering hardcopy proofs.
Designed for the creative workow, Apple displays deliver stunning image quality not found in other at panels. Each display features 100-pixel-per-inch resolution for an ideal balance of text readability and image crispness. Wide-viewing technology guarantees consistent and accurate color across a 170-degree viewing spectrum. Color quality is also superior, with a broad color gamut, high display brightness, and uniform color across the panel. All Apple Cinema Displays can be calibrated for color-managed workows and will maintain consistent color and quality without frequent recalibration. For more information, see Choosing an Apple display Apple oers a choice of three widescreen at-panel displays: The 20-inch Apple Cinema Display (1680-by-1050-pixel resolution) shows more than two full pages of graphics, layouts, and textor DVD movies in wide format. The 23-inch Apple Cinema HD Display (1920-by-1200-pixel resolution) supports high denition content and stunning color for multipage layouts and video editing. The largest LCD ever designed for a personal computer, the astounding 30-inch Apple Cinema HD Display (2560-by-1600-pixel resolution) puts more than 4 million pixels at your ngertips.

Support for Multiple Displays
Connecting to other displays, TVs, VCRs, and projectors A DVI to VGA Adapter is included with every Power Mac G5 for connecting to VGA displays, such as CRTs or projectors. Or you can order the Apple DVI to Video Adapter to connect to S-video and composite devices, such as TVs, VCRs, or overhead projectors with S-video or RCA (composite) connectors.8
Every Power Mac G5 graphics card supports two displays in extended desktop and video mirroring modes. Extended desktop mode lets you distribute work across two displays, allowing more room for viewing rich content and complex applications that use oating palettes and long timelines. For example, you can view Final Cut Pro on one display while watching the video output on the other. Video mirroring mode outputs the same information on both displays, which means you can control a presentation from one display while the audience watches it on a second display or projected image. The possibilities get even more interesting when you connect more than two displays. For maximum productivity, extend your desktop across up to eight displays.5 Or consider controlling a set of public information kiosks or constructing a multimedia museum exhibit from a single Power Mac G5 system.

Real-World Advantages

The new Power Mac G5 and Mac OS X deliver performance and platform advantages that make it the system of choice for professionals in the creative and scientic elds. With dual-core PowerPC G5 processors, a new PCI Express architecture, and workstation graphics features, this groundbreaking system opens up a wealth of possibilities for 2D and 3D designers, video and audio producers, scientists, and researchers.

Film and Video

No matter what the formatDV, SD, HDV, HD, or even lmthe Power Mac G5 gives lm and video professionals the freedom and power to create studio-quality projects. Dual-core and quad-core Power Mac G5 systems speed up editing and enhance multistream and multicam production using Final Cut Studiosupporting more simultaneous streams and real-time eects, as well as accelerating video processing and rendering. PCI Express graphics cards, such as the optional GeForce 7800 GT and Quadro FX 4500 from NVIDIA, boost motion graphics and animation performance in applications such as Motion, After Eects, Maya, and Modo. A host of integrated technologies allow you to customize a state-of-the-art studio: fast DDR2 memory expandable to 16GB, support for multiple Apple Cinema Displays, PCI Express expansion for Fibre Channel and video acquisition cards, and FireWire 800 for high-performance decks and devices. Fast encoding and a SuperDrive with double-layer support make it easy to author commercial-grade DVDs in record time using DVD Studio Pro. A workow based on Mac OS X and QuickTime gives you the exibility to author in any format, while XML extensibility lets you share projects between applications. Xsan for video workows The Power Mac G5 is the perfect client for Xsan, Apples enterprise-class storage area networking (SAN) solution. Xsan provides concurrent access to terabytes of storage on centralized Xserve RAID volumes from multiple computersproviding the high performance required by individual editors, as well as the stability and security valued by network administrators. Use the new Apple Fibre Channel PCI Express Card to connect the Power Mac G5 to Xserve RAID and an Xsan network. This card runs at full bandwidth in a four-lane or eight-lane PCI Express slot. Built-in dual Gigabit Ethernet interfaces on the Power Mac connect to the metadata controller and network servicesfreeing up slots for specialized cards, such as the NVIDIA Quadro FX 4500 for accelerating eects and animation, a PCI Express video I/O card for input or preview of footage, or even an audio DSP or I/O card for sound editing. For more information on the Xsan video workow, visit

Use the new Apple Fibre Channel PCI Express Card to connect to Xserve RAID for highperformance, high-availability storage.
Video editing performance One of the nal stages of any lm or video project is the processor-intensive task of rendering. Apple measured the time to render a complex video project containing multiple eects and lters, including color corrections, transitions, compositing, and basic text treatments. Final Cut Pro 5.0.2 rendering results
High denition video (HDV1080i60) video rendering
Power Mac G5 Quad 2.5GHz Dual 2.7GHz Power Mac G5 44% faster Baseline
Standard denition (SD) video rendering
Power Mac G5 Quad 2.5GHz Dual 2.7GHz Power Mac G5 40% faster Baseline
Digital video (DV) video rendering
Power Mac G5 Quad 2.5GHz Dual 2.7GHz Power Mac G5 34% faster Baseline
Percent faster than the previous model
The Power Mac G5 Quad rendered an HDV project 44 percent faster than the dual 2.7GHz Power Mac G5. Performance gains were similar for SD and DV projects.*
* Testing conducted by Apple in September 2005 using preproduction 2.5GHz Power Mac G5 Quad units; all other systems were shipping units.
Video encoding performance Apple measured the time to encode a video project from various native formats to MPEG-2, the most common format for commercial DVD titles. Final Cut Pro 5.0.2 encoding results
High denition video (HDV1080i60) MPEG-2 encoding
Power Mac G5 Quad 2.5GHz Dual 2.7GHz Power Mac G5 Baseline 22% faster
Standard denition (SD) MPEG-2 encoding
Power Mac G5 Quad 2.5GHz Dual 2.7GHz Power Mac G5 Baseline 60% faster
Digital video (DV) MPEG-2 encoding
The Power Mac G5 Quad encoded an HDV project 22 percent faster than the dual 2.7GHz Power Mac G5. Performance gains were even better for SD and DV encoding: The Power Mac G5 Quad encoded SD video 60 percent faster than the dual 2.7GHz Power Mac G5and encoded DV projects 44 percent faster.*
Eects and animation performance Video editors and producers add innovative motion graphics and eects to lm, video, DVD, and web projects using tools like Motion, Adobe After Eects, LightWave 3D, and Cinema 4D. To demonstrate the performance advantages of quad-core processors, Apple measured the time to render eects using three application tests. After Eects 6.5.1 results Visual eects rendering

Support for analog resolutions up to 2048 by 1536 pixels DVI to VGA Adapter included Dual-display support for extended desktop and video mirroring modes Support for up to two Apple at-panel displays for each graphics card installed5
Storage Two 3.5-inch hard drive bays, each with a 150-MBps Serial ATA controller; one of the following is installed: One 160GB 7200-rpm Serial ATA; 8MB memory buer One 250GB 7200-rpm Serial ATA; 8MB memory buer One or two 500GB 7200-rpm Serial ATA; 16MB memory buer (build-to-order option) 16x SuperDrive with double-layer support (DVD+R DL/DVDRW/CD-RW); writes DVD-R discs at up to 16x speed, writes DVD+R DL discs at up to 6x speed, reads DVDs at up to 16x speed, writes CD-R and CD-RW discs at up to 24x speed, reads CDs at up to 32x speed PCI expansion Two open full-length four-lane PCI Express slots One open full-length eight-lane PCI Express slot PCI Express cards of any size supported in all slots Communications Two independent 10/100/1000BASE-T Ethernet (RJ-45) interfaces with support for jumbo frames Optional AirPort Extreme and Bluetooth 2.0 + EDR (build-to-order option or installed by Apple Authorized Service Provider) AirPort Extreme: Based on IEEE 802.11g standard and Wi-Fi Certied for 802.11g and 802.11b interoperability3 Bluetooth: Support for Enhanced Data Rate, or data rates up to 3 Mbps Optional external Apple USB Modem (RJ-11) Peripherals and audio One FireWire 800 port; two FireWire 400 ports (one on front panel; 15W total power) Four USB 2.0 ports (one on front panel); two USB 1.1 ports on included keyboard Front headphone minijack and speaker Optical digital audio input and output Toslink connectors Stereo analog line-level input and output minijacks Electrical and environmental requirements Meets ENERGY STAR requirements Line voltage: 100125V AC or 200240V AC (wide-range power supply input voltage) Frequency: 50Hz to 60Hz, single phase Maximum current: At least 10A (low-voltage range) or 5A (high-voltage range) Operating temperature: 50 to 95 F (10 to 35 C) Storage temperature: 40 to 149 F (40 to 65 C) Relative humidity: 5% to 95% noncondensing Maximum altitude: 10,000 feet Size and weight Height: 20.1 inches (51.1 cm) Width: 8.1 inches (20.6 cm) Depth: 18.7 inches (47.5 cm) Weight (standard congurations): 44.5 to 48.8 pounds (20.2 to 22.1 kg)10


Below is a list of the new hardware features of the Power Mac G5. A list of all hardware features is provided in Hardware Features Summary (page 11).
Microprocessors: The Power Mac G5 computer is available in dual 2.0 GHz, 2.3 GHz, and 2.7 GHz configurations. For more information, see PowerPC G5 Microprocessor (page 22). Graphics card: The Power Mac G5 computer comes standard with one of the following graphics cards: the ATI Radeon 9600 with 128 MB RAM or the ATI Radeon 9650 with 256 MB RAM. The NVIDIA GeForce 6800 Ultra DDL with 256 MB RAM is a build-to-order option. For more information, see Graphics Cards (page 29). Hard disks: An internal 7200 rpm Serial ATA (SATA) hard disk occupies one of two drive bays and functions as the default boot disk. A second SATA drive is available as a build-to-order option. Hard disk capacities are 160 GB, 250 GB, and a 400 GB build-to-order option. For more information, see Serial ATA Interface (page 27). Power supply: The Power Mac G5 computer comes with a 450 W or 600 W power supply. SuperDrive (DVD+R DL/DVD+/-RW/CD-RW): The Power Mac G5 computer has a 16x SuperDrive connected to the Ultra DMA ATA/100 bus. The SuperDrive supports DVR+R double-layer (DL) format. For more information, see SuperDrive (page 38). Bluetooth 2.0 + EDR: Available as a build-to-order option or as an Apple Authorized Service Provider kit. The fully-integrated Bluetooth 2.0 module with enhanced data rate (EDR) enables short-range wireless connections between desktop and laptop computers and a host of other peripheral devices. For more information, see Bluetooth Technology (page 41).
Hardware Features Summary
Below is a list of all of the hardware features of the Power Mac G5. The major features are described more fully later in this note. To view the Technology and Performance Overview document, refer to
Microprocessors: The Power Mac G5 computer is available in dual 2.0 GHz, 2.3 GHz, and 2.7 GHz configurations. For more information, see PowerPC G5 Microprocessor (page 22).
Processor system bus: The processor interface system bus runs at half the speed of the system microprocessor. For more information, see Processor Bus (page 23). Memory caches: The PowerPC G5 microprocessors used in the Power Mac G5 computer have an internal 512 KB level 2 cache. Memory bus: The main memory bus is 128 bit 400 MHz. For more information, see Main Memory Bus (page 23). DDR SDRAM: Depending on configuration, the Power Mac G5 has four or eight DIMM slots for 184 pin DIMMs (dual inline memory modules) using unbuffered DDR (double data rate) SDRAM 64-bit, 400 MHz (PC3200) devices for a maximum of 4 GB or 8 GB. For more information, see Main Memory Bus (page 23). Liquid cooling system: One configuration has a liquid cooling system. For more information, see Liquid Cooling System (page 30). AGP 8x Pro slot: The computer has an AGP 8x Pro slot with an accelerated graphics card installed. For more information, see Accelerated Graphics Port Bus (page 23). PCI expansion slots: Some configurations support three 64-bit 33 MHz PCI slots. For more information, see PCI or PCI-X Expansion Slots (page 24). PCI-X expansion slots: Some configurations support three PCI-X expansion slots: one slot supports a maximum of 133 MHz and two slots support a maximum of 100 MHz. For more information, see PCI or PCI-X Expansion Slots (page 24). Hyper Transport bus: The Power Mac G5 supports the high-speed bus architecture between the memory controller and device I/O. For more information, see HyperTransport Technology (page 25). Graphics card: The Power Mac G5 computer comes standard with one of the following graphics cards: the ATI Radeon 9600 with 128 MB RAM or the ATI Radeon 9650 with 256 MB RAM. The NVIDIA GeForce 6800 Ultra DDL with 256 MB RAM is a build-to-order option.For more information, see Graphics Cards (page 29). Hard disks: An internal 7200 rpm Serial ATA (SATA) hard disk occupies one of two drive bays and functions as the default boot disk. A second SATA drive is available as a build-to-order option. Hard disk capacities are 160 GB, 250 GB, and a 400 GB build-to-order option. For more information, see Serial ATA Interface (page 27). Power supply: The Power Mac G5 computer comes with a 450 W or 600 W power supply. SuperDrive (DVD+R DL/DVD+/-RW/CD-RW): The Power Mac G5 computer has a 16x SuperDrive connected to the Ultra DMA ATA/100 bus. The SuperDrive supports DVR+R double-layer (DL) format. For more information, see SuperDrive (page 38). Combo (DVD-ROM/CD-RW) drive: Instead of a SuperDrive, the Power Mac G5 computer has an optional build-to-order combination DVD-ROM/CD-RW drive connected to the Ultra DMA ATA/100 bus. For more information, see Combo Drive (page 39). High-speed USB 2.0: The computer has three external USB 2.0 ports: two on the rear of the enclosure and one on the front. All ports support both high-speed and classic USB speeds. For more information, see USB Ports (page 31).

Features of the Enclosure
The Power Mac G5 computers enclosure is a tower design. Figure 1-1 (page 14) illustrates the front of the enclosure and Figure 1-2 (page 15) illustrates the rear of the enclosure. Figure 1-1 Power Mac G5 front view

Figure 1-2

Power Mac G5 rear view
Access covers for PCI expansion slots DVI display port Door latch AirPort antenna port DVI display port Bluetooth antenna port Optical digital audio out port Optical digital audio in port Audio line-out port Audio line-in port USB 2.0 ports (2) Power socket FireWire 400 port FireWire 800 port Ethernet port Internal modem port (on some models)
The enclosure has space for two hard disk drives and one optical device. See Hard Disk Drives (page 38). To access the main logic board to install PCI or PCI-X cards or additional memory, refer to Expansion (page 55). For full details regarding opening and accessing the computer, refer to the Power Mac G5 Users Guide that was shipped with your computer. Warning: Opening the enclosure side panel impacts the thermal performance of the computer. Do not run the enclosure with the side panel open. If the air deflector inside the enclosure is removed, the fans will spin very slowly and the system will take action to prevent over-heating.

System Software

The Power Mac G5 ships with Mac OS X 10.4 installed as the default operating system. The classic environment can be used to run Mac OS 9 applications. Load the Classic application from the system software optical disk that shipped with your computer. To retrieve information from the I/O Registry, use the APIs in the header file IOKit/IOKitLib.h.

Computer Identification

Rather than reading the box flag or the model string and then making assumptions about the computers features, applications that need to find out the features of the computer should use I/O Registry calls to test for the features they require.
Asset management software that reports the kind of computer it is run on can obtain the value of the property at Devices:device-tree:compatible in the IODeviceTree plane of the I/O Registry. The model string is the first program-usable string in the array of C strings in the compatible field. For the Power Mac G5 2.0 GHz and 2.3 GHz configurations, the value of the model property is PowerMac7,2 ; the 2.7 GHz configuration model property value is PowerMac7,3. Note: To differentiate these models of the Power Mac G5 from previous versions, look at the EMC number on the label on the back of the computer. This developer note addresses EMC number 2061.

Power Management

The basics of Power Mac G5s power management techniques are described in the following paragraphs.
Processor and Bus Slewing
To lower power consumption, heat generation, and fan noise, the Power Mac G5 computer incorporates an automatic power management technique called bus slewing. Bus slewing is designed to run at high processor/bus speeds and high voltage when the demand on the processor is high, and to run at low processor/bus speeds and low voltage when the demand on the processor is low. Note: The memory bus runs at 400 MHz and does not slew. Switching between different processor/bus speeds and voltages is achieved by a gradual transition that is designed to minimally impact system or application performance and typically operates seamlessly to the user. In slewing, the bus runs at half the speed of the processor. The ranges of the slewed processor speeds are listed below: Configuration Processor range 2.0 GHz 2.3 GHz 2.7 GHz 1.8 GHz to 2.0 GHz 1.8 GHz to 2.3 GHz 2.0 GHz to 2.7 GHz
In addition, the Power Mac G5 computer allows the user to control bus slewing mode. The options for specifying either high, reduced, or automatic processor and bus speeds are located at System Preferences>Energy Saver>Options; then select Automatic, Highest, or Reduced. Note: For best performance when using professional applications with high demand on the system (such as Final Cut Pro or Logic), you may want to set the processor/bus speed option to highest. If the Power Mac G5 computer detects a processor temperature that is high, due to high ambient temperatures or other factors, it will automatically enter bus slewing mode regardless of the selected setting.

Processor States

The following processor states are defined:
Run: The system is running at maximum processing capacity with all processors running at full speed. Idle: The system is idling; this is the default state. All clocks are running and the system can return to running code within a few nanoseconds. If the system has no work to do, it will be in idle mode.

System Modes

The Macintosh system has the following power-saving modes. If the system does not support full sleep, it will use the less efficient doze mode.
Run: The system is fully functional in normal operating mode with all components powered and operating. Doze: The power to the disk drive motors and the display is turned off, but the power supply and fans are still on. PCI cards that don't support full system sleep (some SCSI cards, some graphics cards) will cause the machine to doze rather than fully sleep. Full sleep: The main power supply is shut down. A trickle supply provides auxiliary power to the PCI slots and keeps the DRAM state preserved for a quick recovery. All processors are powered off with their state preserved in DRAM. All non-essential clocks in the system are suspended. This mode allows the computer to meet Energy Star sleep requirements while providing the ability to start up without rebooting. This system may be awakened by administrative network packets, keyboard or mouse activity, USB device insertion or removal, or PMU scheduled wakeup. Off: The Power Mac G5 computer meets FEMP (Federal Energy Management Program) requirements and supports FireWire ports functioning as repeaters when operating on AC power.

U3H 400 MHz DDR memory memory controller bus and PCI bus bridge 16-bit 4.8 GBps Hyper Transport PCI-X bridge PCI-X slots 8-bit 1.6 GBps Hyper Transport

12 Mbps USB

100 MHz 100 MHz 133 MHz

Internal speaker

Modem slot

PMU99 power controller

K2 I/O device and disk controller
The Power Mac G5 computer has the following data buses, not counting the processors dedicated interface to the backside cache.
Dual processor bus: 1 GHz/1.15 GHz/1.35 GHz (running at half the speed of the processor), 64-bit (32-bit in and 32-bit out) data throughput per processor connecting the processor module to the U3H IC Dual processor systems have two independent 64-bit processor buses Memory bus: 400 MHz, 128-bit bus connecting the main DDR SDRAM memory to the U3H IC 8x AGP Pro bus: 266/533 MHz, 32-bit bus connecting the AGP graphics card to the U3H IC PCI bus: some configurations support three 64-bit 33 MHz PCI slots
PCI-X bridge bus: some configurations support three 64-bit PCI-X slots: two 100 MHz and one 133 MHz Internal PCI bus: 33 MHz, 64-bit bus supports the K2 I/O controller, the boot ROM, the AirPort Extreme Card slot, the USB controller, and in some configurations the Bluetooth module Serial ATA (SATA) buses: support 1.5 Gbps internal hard drive connectors Ultra DMA ATA/100 bus: supports internal optical drive HyperTransport: high-speed, bidirectional, point-to-point link for integrated circuits supports bidirectional data rates up to 4.8 GBps, on applicable configurations
The remainder of this chapter describes the architecture of the processor module, the U3H memory controller and bridge IC, the K2 I/O controller IC, and the USB controllers.

Processor Module

The dual processor Power Mac G5 contains two identical PowerPC G5 processor modules. Each processor module is connected to the main logic board by a 300-pin connector. To achieve the required level of performance, the signal lines that connect the processor module and the main logic board are carefully matched in length, loading, and impedance.
PowerPC G5 Microprocessor
The PowerPC G5 used in the Power Mac G5 computer has the following features:
64-bit PowerPC implementation with 42-bit physical memory addressing core runs at twice the bus speed superscalar execution core supporting more than 200 in-flight instructions two independent double-precision floating point units Velocity Engine: 128-bit-wide vector execution unit 64K L1 instruction cache, 32K L1 data cache per processor fully symmetric multiprocessing capability built-in 512 KB backside L2 cache per processor two independent, unidirectional 1.0 GHz to 1.35 GHz frontside buses each supporting up to 10.8 GBps data throughput per processor

For more information, see the reference at PowerPC G5 Microprocessor (page 63).
Bridge and Memory Controller
The U3H custom IC is at the heart of the Power Mac G5 computer. It provides the bridging functionality among the processors, the memory system, HyperTransport bus to the PCI-based I/O system, and the AGP slot.

Processor Bus

The processor bus is a 1 GHz, 1.15 GHz or 1.35 GHz bus connecting the processor module to the U3H IC. The bus has 64-bit (32-bit in and 32-bit out) wide data and 36-bit wide addresses. The Power Mac G5 system controller is built with 130-nanometer, SOI technology. This super-efficient point-to-point architecture provides each subsystem with dedicated bandwidth to main memory. The Power Mac G5 uses separate processor boards with each PowerPC G5 processor; two processor boards are used for the Power Mac G5s dual processor design. The U3H I/O implements two independent processor interfaces. The processor clock is derived from a PLL which multiplies the reference clock by preset intervals of 8 times. Out-of-order completion allows the memory controller to optimize the data bus efficiency by transferring whichever data is ready, rather than having to pass data across the bus in the order the transactions were posted on the bus. This means that a fast DDR SDRAM read can pass a slow PCI read, potentially enabling the processor to do more before it has to wait on the PCI data. Intervention is a cache-coherency optimization that improves performance for dual-processor systems. If one processor modifies some data, that data first gets stored only in that processors cache. If the other processor then wants that data, it needs to get the new modified values.

Main Memory Bus

The Power Mac G5 computer main memory bus connects the main memory to the U3H IC via the 128-bit data bus. The memory modules are 400 MHz (PC3200) DDR SDRAM DIMMs with a per system maximum of 4 GB or 8 GB, depending on the configuration. Standard supported DIMM sizes are 128, 256, 512 MB, and 1 GB. The DIMMs must be unbuffered and installed in pairs of the same size. For more information about memory DIMMs and installation, see RAM Expansion (page 55).
Accelerated Graphics Port Bus
The accelerated graphics port (AGP 8x Pro) bus is a 266/533 MHz, 32-bit bus connecting the AGP card to the U3H IC. DDR data is transmitted at both edges of the clock for peak transfers of 2.1 GBps. The AGP bus is an enhanced PCI bus with extra functionality to burst texture data and other graphics across the port up to 8 times faster than a 66 MHz PCI port. The Power Mac G5 computers AGP implementation is compatible with version 3 of the AGP specification and with the Pro version of AGP. AGP 3.0 enables deeply pipelined memory read and write operations and demultiplexing of address and data on the bus.

The DB-DMA system provides a scatter-gather process based on memory-resident data structures that describe the data transfers. The DMA engine is enhanced to allow bursting of data files for improved performance.

Wireless LAN Module

The AirPort Extreme Card wireless LAN module (via the PCI USB controller) contains a media access controller (MAC), a digital signal processor (DSP), and a radio-frequency (RF) section. The module is wired to an antenna port on the rear of the computer. The AirPort Extreme Card is compliant with the IEEE 802.11g standard. The card transmits and receives data at up to 54 Mbps and is compatible with Apple AirPort systems as well as other 802.11b and 802.11g Wi-Fi certified products. For information about its operation, see AirPort Extreme Card (page 40). The internal Bluetooth module connectivity comes off the PCI USB controller. See Bluetooth Technology (page 41) for more information.

Modem Slot Support

The K2 IC supports the modem and provides DB-DMA (descriptor-based direct memory access) support for the modem slot interface. The modem is connected via an I2S interface. The internal hardware modem is a separate module that contains a modem controller IC, a data pump, and the interface to the telephone line (DAA). For more information about the modem, see Internal Modem (page 40).

Boot ROM

The boot ROM consists of 1 MB of on-board flash EEPROM. The boot ROM includes the hardware-specific code and tables needed to start up the computer using Open Firmware, to load an operating system, and to provide common hardware access services.

Ethernet Controller

The K2 IC includes an Ethernet media access controller (MAC) and PHY. As a separate I/O channel on the K2 IC, it can operate at its full capacity without degrading the performance of other peripheral devices. The MAC implements the link layer. It is connected to a PHY that is internal to K2 and provides 10Base-T/UTP, 100Base-TX, or 1000Base-T operation over a standard twisted-pair interface. The Ethernet port is auto-sensing and self-configuring to allow use of either a cross-over or straight-through cable. The operating speed of the link is automatically negotiated by the PHY and the bridge, router, hub, switch, or other Mac or PC to which the Ethernet port is connected. For information about the Ethernet port, see Ethernet Port (page 36).

Power Controller

The power management controller in the Power Mac G5 computer is a microcontroller called the PMU99. It supports new modes of power management that provide significantly lower power consumption than earlier systems. The Power Mac G5 also utilizes a service processor unit and a fan controller unit (refer to Fan Controller (page 29)). For more information on power management strategy, see Power Management (page 16).

Graphics Cards

The Power Mac G5 comes with a high-performance AGP graphics card with DDR SDRAM memory. Table 2-1 lists the supported graphics cards, video memory, and power. Table 2-1 Graphics IC ATI Radeon 9600 ATI Radeon 9650 Graphics Cards SDRAM and Power Video SDRAM Power usage PCI power available 128 MB 256 MB 15W 15 W 105 W 75 W 75 W 30 W
NVIDIA GeForce 6800 Ultra DDL (build-to-order) 256 MB
The build-to-order GeForce 6800 Ultra DDL occupies both the AGP slot and the adjacent PCI slot. For information on PCI expansion slots, refer to PCI or PCI-X Expansion Slots (page 24). All graphics cards support dual displays in either extended desktop or video mirroring mode, and the dual-link cards support a 30 Apple Cinema HD display at digital resolutions up to 2560x1600 pixels and analog resolutions up to 1600x1200 pixels. For information about the graphics cards ports and modes, see Video Monitor Ports (page 49). The display memory on the AGP card is separate from the main memory. The display memory consists of 128 MB or 256 MB of DDR devices configured to make a 128-bit data bus. The display memory cannot be expanded by the user.

Fan Controller

The Power Mac G5 system employs advanced thermal and wattage management to keep acoustic noise to a minimum. The enclosure is divided into discrete zones, each with independently controlled fans bringing in cool air from the front of the enclosure, directing it over system components and exhausting it out the rear. Temperature and power consumption are monitored by the operating system which communicates with the Fan Control Unit, which in turn controls and monitors fan operation. Note that if Mac OS X is not booted, thermal management must be provided by the alternate development operating system.
Fan Control Unit (FCU) controls the fans and pumps in the Power Mac G5 and regulates the speeds to run each fan. The FCU derives fan speed from sensors in each thermal zone. Some of these sensors are thermal while others monitor power/wattage used in a particular area. It is important to note that there are fixed limits to fan speed in those areas where power sensors are used. At the upper limits, a fan could be fixed at a particular speed, based on power consumption, even though that zone continues to generate more heat. If the FCU does not receive an update from the operating system within two minutes, it begins to ramp up the speed of the fans to full speed.

Liquid Cooling System

FireWire 800 Connector

The FireWire 800 port on the Power Mac G5 computer is based on IEEE 1394b and enables a 800 Mbps transfer rate. FireWire 800 uses a 9-pin connector and is backwards compatible with original 1394a (FireWire 400) devices with 6-pin or 4-pin connectors. With the appropriate cable, the 9-pin port works seamlessly with legacy FireWire devices. Cables are available to go from both 6-pin and 4-pin connectors to a 9-pin, and 9-pin to 9-pin. The 9-pin FireWire 800 connector is shown in Figure 3-2 (page 33). Its connector signals and pin assignments are shown in Table 3-2 (page 33). Figure 3-2
9-pin FireWire 800 connector

Table 3-2

Signals on the 9-pin FireWire 800 connector
Pin Signal name Description TPB TPB+ TPA TPA+ Twisted-pair B Minus Twisted-pair B Plus Twisted-pair A Minus Twisted-pair A Plus
Pin Signal name Description 9 TPA (R) VG SC VP TPB (R) Twisted-pair A Ground Reference Power Ground Status Contact (no connection; reserved) Power Voltage (approximately 25 V DC) Twisted-pair B Ground Reference
VP (pin 8) provides up to 15 W power, shared with the other FireWire connectors. The voltage on the power pin is approximately 25 V. The 9-pin FireWire port is capable of operating at 100, 200, 400, and 800 Mbps, depending on the device it is connected to. Using a cable with a 9-pin connector at one end and a 4-pin or 6-pin connector at the other, the 9-pin port is capable of directly connecting to all existing FireWire devices. Using a cable with 9-pin connectors at both ends, the 9-pin port is capable of operating at 800 Mbps. The IEEE 1394b standard defines long-haul media using Cat 5 UTP and several kinds of optical fiber. The Power Mac G5 computer is interoperable with such cables but cannot be directly connected to them. To use long-haul cables, connect the computer to a 1394b hub that has the desired kind of long-haul connectors. If the hub has a bilingual port, that port can be connected to any of the computers FireWire ports. If the hub has a beta-only port, it can be connected only to the computers 9-pin port.

FireWire 400 Connector

The FireWire 400 ports 1 and 2 use the six-pin connectors shown in Figure 3-3 (page 34). The connector signals and pin assignments are shown in Table 3-3 (page 35). Figure 3-3 6-pin FireWire 400 connector

Table 3-3 Pin 5 6

Signals on the 6-pin FireWire 400 connector
Signal name Description Power Ground TPB TPB+ TPA TPA+ Power (approximately 25 V DC) Ground return for power and inner cable shield Twisted-pair B Minus Twisted-pair B Plus Twisted-pair A Minus Twisted-pair A Plus Outer cable shield


The power pin provides up to 15 W total power, shared with the other FireWire connectors. The voltage on the power pin is approximately 25 V. Pin 2 of the 6-pin FireWire connector is ground return for both power and the inner cable shield. In a FireWire cable with a 4-pin connector on the other end, the wire from pin 2 is connected to the shell of the 4-pin connector. The signal pairs are crossed in the cable itself so that pins 5 and 6 at one end of the cable connect with pins 3 and 4 at the other end. When transmitting, pins 3 and 4 carry data and pins 5 and 6 carry clock; when receiving, the reverse is true.
FireWire Device Programming
Mac OS X includes general support for the FireWire bus and specific support for various kinds of FireWire devices and protocols. Developers can use the built-in support or provide additional applications and drivers for use with their products. The general FireWire services will configure the FireWire bus, scan the bus for new devices, and allow multiple drivers and devices to share a single FireWire interface cooperatively. The general services also publish information about the bus and the devices in the IO Registry, so that IO Kit can match protocols and drivers to each connected FireWire device. The specific device and protocol support in Mac OS X as provided with the Power Mac G5 includes the following:
General services for Serial Bus Protocol 2 (SBP-2) and support for most mass storage devices using SBP-2, such as hard disk drives, optical drives, flash card readers, Target Disk Mode (see Target Disk Mode (page 36), and the iPod. Mac OS X can boot from most of these devices. General services for the Audio Video Control (AV/C) protocol and support for most digital video (DV) cameras and decks using this protocol, including video capture through standard QuickTime APIs. A QuickTime device driver for IIDC/DCAM type cameras such as the iSight. A network device driver supporting IP (Internet Protocol) over FireWire according to IEEE RFC 2734.
Additional services for user-space and kernel access to all FireWire resources.
For information on writing FireWire drivers or applications, download the latest FireWire SDK from

Bluetooth is available as a fully-integrated build-to-order option or as an Apple Authorized Service Provider kit, which can be installed by an Apple retail store or an Apple Authorized Service Provider. When the Bluetooth option is included on the factory order, the Bluetooth antenna is provided in the accessory kit and must be installed on the Bluetooth antenna port on the rear of the enclosure. The Bluetooth technology supports the following profiles:
serial port (SPP) provides a wireless serial connection to other Bluetooth devices dial-up networking (DUN) enables a mobile phone to act as a modem object push (OPP) enables the transfer of files between Bluetooth devices human interface device (HID) enables the use of Bluetooth input devices (keyboards and mice) Bluetooth file transfer profile (FTP) enables browsing of the file system of other Bluetooth devices which support Bluetooth FTP hardcopy cable replacement profiler (HCRP) describes how to send rendered data over a Bluetooth link to a device, such as a printer. Although other profiles can be used for printing, the HCRP is specially designed to support hardcopy applications. headset profile (HSP) enables the use of Bluetooth-enabled wireless headsets for applications such as iChat. This profile does not enable use of Apple Speech Recognition due to the fact that it is a low-precision audio channel.
For more information on Bluetooth technology, refer to Bluetooth (page 67).


The Power Mac G5 computer comes with an Apple Keyboard. It is a full-size keyboard with function keys and separate numeric keypad and editing sections. The keyboard has an attached 1-meter cable and comes with a 1-meter extender cable for installations where the computer is located on the floor or away from the immediate desktop area.

Keyboard Features

Here is a list of the features of the Apple Keyboard.
sloped design 109 keys (on the ANSI versions) 16 function keys 6 editing keys (Page Up, Page Down, Home, End, Forward Delete, and Help) USB HID Consumer Page Usage multimedia control keys
full travel, standard pitch keys on alphanumeric, editing, and keypad sections, including function keys and cursor-position keys localized worldwide: 33 versions, standard layouts (including: ANSI, JIS, ISO) LED indicator on the Caps Lock key USB hub functionality with two USB 1.1 sockets

Note: There is no power key on this keyboard.

Keyboard Layout

There are localized versions of the Apple Keyboard for use in different parts of the world. The three standards used are ANSI (US and North America), JIS (Japan), and ISO (Europe). Applications can determine which keyboard is connected by calling the Gestalt Manager and checking for the corresponding value of the gestaltKeyboardType selector. Figure 3-4 (page 43) shows the keyboard layout for the ANSI keyboard. Figure 3-4 ANSI keyboard layout

MultiMedia Control Keys

The keyboard has six multimedia keys: Volume Up, Volume Down, Mute, Brightness Up (F15), Brightness Down (F14), and Eject. Theses keys provide direct control of the features on the computer by way of the USB.

Keyboard and USB

The Apple Keyboard is designed to work with the computer by way of the USB ports. The keyboard has a captive cable with a USB Type A connector. The keyboard is a bus-powered USB hub with two USB Type A ports.
Warning: A bus-powered hub as defined in the USB specification does not provide enough power to support a second bus-powered hub. A second bus-powered hub must be connected to a USB port on the computer or other self-powered hub, not to a port on the keyboard. Apple provides a HID class driver for the Apple Keyboard, which supports the USB boot protocol. Other keyboards intended for use on the Macintosh platform must support the HID boot protocol, as defined in the USB Device Class Definition for Human Interface Devices (HIDs).

Programmers Switches

Key combinations for programmers switches that used the Power button on earlier models now use the Eject key. Here are the key combinations for the Power Mac G5 computer.
Control-Command-Eject: restart immediately (reset) Control-Command-Option-Eject: shut down immediately Control-Eject: display the dialog for shutdown, restart, and sleep
The key combinations are decoded in software and may not be available under some crashed conditions.
NMI without Programmers Switch
Current Macintosh computers do not have a programmers switch, which allowed users to generate a non-maskable interrupt (NMI). The paragraphs below describe how to generate an NMI from a remote session for systems that do not have a physical programmer's switch. Starting with Mac OS X 10.1.2, the OS will promote and recognize the DB_NMI bit in the boot-args property of the chosen node from Open Firmware. When the DB_NMI bit is set, the user can generate a non-maskable interrupt (NMI) by pressing the system's power button. This replaces the power buttons sleep or wake response. The system reads the state of the bit at boot time from the boot-args configuration variable. For more information about the debug flags, please see Inside Mac OS X: Kernel Programming. To set the DB_NMI bit, enter the following command at the Terminal to display the current debug flag settings.


Supplemental Reference Documents
For more information about the technologies mentioned in this developer note, you may wish to consult some of the references listed in the following sections. For information about older models of Macintosh computers, refer to the developer notes archive at

Apple Technical Notes

Apple Technical Notes answer many specific questions about the operation of Macintosh computers and the Mac OS. The notes are available on the Technical Note website at
Information about the PowerPC G5 microprocessor is available on the World Wide Web at

Velocity Engine

Velocity Engine is Apples vector processor in the PowerPC G5 microprocessor. Apple provides support for developers who are starting to use the Velocity Engine in their applications. Documentation, development tools, and sample code are available on the Apple website, at Motorola's implementation of Apple's Velocity Engine is named AltiVec. The AltiVec Technology Programming Environments Manual (AltiVec PEM) is a reference guide for programmers. It contains a description for each instruction and information to help in understanding how the instruction works. You can obtain a copy of the AltiVec PEM through the Motorola documentation site on the World Wide Web, at

3D Graphics

Developers of 3D graphics for games should know about OpenGL for Macintosh, a version of SGIs application programming interface (API) and software library for 3D graphics. Developer support and documentation is available at

Mac OS X

Initially, the Power Mac G5 computer ships with Mac OS X 10.4 installed as the default operating system. The classic environment can be used to run Mac OS 9 applications, For access to Apples developer documentation for Mac OS X, see the Apple Developer Connection (ADC) website at O'Reilly & Associates publishes a series of books about Mac OS X development. The books in this series have been technically reviewed by Apple engineers and are recommended by the Apple Developer Connection.

ohms seconds volts watts
kHz kilohertz k lb kilohms pounds
Other abbreviations used in developer notes include these: ADC AGP ATA ATAPI AV CAS CAV CD-ROM CLV DART DB-DMA DDC DDR DIMM DIN DMA DRAM DVD DVD-ROM DVD-RAM DVI EDO EHCI Apple Display Connector accelerated graphics port advanced technology attachment advanced technology attachment, packet interface audio visual column address strobe constant angular velocity compact disc read-only memory constant linear velocity DMA Address Relocation Table descriptor-based direct memory access display data channel double data rate, a type of SDRAM where data is clocked on rising and falling clock edges dual inline memory module Deutsche Industrie Norm direct memory access dynamic random-access memory 12 cm optical storage system with 4 GB capacity DVD read-only memory DVD that is both readable and writable Digital Visual Interface extended data out DRAM device type Enhanced Host Controller Interface, USB 2.0 specification


extended IDE electromagnetic interference fan controller unit Generation 5, the fifth generation of PowerPC microprocessors, incorporating Velocity Engine technology Graphics Address Remapping Table data throughput rate giga bytes per second data throughput rate giga bits per second human interface device, a class of USB devices same as IIC same as IIS integrated circuit integrated device electronics Institute of Electrical and Electronics Engineers the official specification for Open Firmware the official specification for FireWire 400 (400 Mbps)
IEEE 1394b the official specification for FireWire 800 (800 Mbps) IIC IIS I/O ISO JEDEC K2 L2 L3 LAN MAC Mac OS MBps inter-IC (an internal control bus) inter-IC sound bus input/output International Organization for Standardization Joint Electronics Devices Engineering Council I/O device and disk controller level 2 (refers to level of cache) level 3 (refers to level of cache) local area network media access controller Macintosh Operating System data throughput rate mega bytes per second


Technical specifications

TypePersonal computer
Product Form FactorTower
Width8.1 in
Depth18.7 in
Height20.1 in
Weight44.5 lbs
TypePowerPC G5 2 GHz
Installed Qty2
Max Supported Qty2
Cache Memory
TypeL2 cache
Installed Size1 MB
Cache Per Processor512 KB
Data Bus Speed1 GHz
Installed Size512 MB / 8 GB (max)
TechnologyDDR SDRAM
Memory Speed400 MHz
Memory Specification CompliancePC3200
Form FactorDIMM 184-pin
Storage Controller
Type1 x Serial ATA - integrated
Controller Interface TypeSerial ATA-150
Channel Qty2
Storage Controller (2nd)
TypeIDE - integrated
Controller Interface TypeIDE
Hard Drive1 x 160 GB - standard - Serial ATA-150 - 7200 rpm
Optical Storage
Read Speed32x (CD) / 10x (DVD)
Write Speed24x (CD) / 8x (DVD)
Rewrite Speed10x
Monitor TypeNone.
Graphics Controller
TypeAGP 8x - plug-in card
Graphics Processor / VendorNVIDIA GeForce FX 5200 Ultra
Video Memory64 MB DDR SDRAM
Digital Video StandardDigital Visual Interface (DVI)
Max Monitors Supported2
Audio Output
TypeSound card - integrated
Input Device
TypeMouse, keyboard
ModemFax / modem - integrated
Max Transfer Rate56 Kbps
Protocols & SpecificationsITU V.92
NetworkingNetwork adapter - integrated
Data Link ProtocolEthernet, Fast Ethernet, Gigabit Ethernet
FeaturesAirPort Extreme ready
Expansion / Connectivity
Expansion Bays Total (Free)1 ( 0 ) x front accessible 2 ( 1 ) x internal - 3.5" x 1/3H
Expansion Slots Total (Free)8 ( 6 ) x memory - DIMM 184-pin 2 ( 0 ) x processor 1 ( 0 ) x AGP Pro 8x 1 ( 1 ) x AirPort Extreme 2 ( 2 ) x PCI-X / 100 MHz - full-length 1 ( 1 ) x PCI-X / 133 MHz - full-length
Interfaces1 x modem - phone line - RJ-11 1 x network - Ethernet 10Base-T/100Base-TX/1000Base-T - RJ-45 2 x IEEE 1394 (FireWire) 1 x IEEE 1394b (FireWire 800) - 9 pin FireWire 800 2 x USB - 4 pin USB Type A 3 x Hi-Speed USB - 4 pin USB Type A 1 x display / video - DVI-Analog/Digital - 29 pin combined DVI 1 x display / video - Apple Display Connector (ADC) - 35 pin ADC 1 x display / video - VGA - 15 pin HD D-Sub (HD-15) 1 x audio - SPDIF input - TOSLINK 1 x audio - SPDIF output - TOSLINK 1 x audio - line-in - mini-phone stereo 3.5 mm 1 x audio - line-out - mini-phone stereo 3.5 mm 1 x headphones - output - mini-phone stereo 3.5 mm
Included AccessoriesAirPort antenna
Cables IncludedDVI-VGA adapter USB cable Modem cable
Device TypePower supply
Voltage RequiredAC 120/230 V ( 50/60 Hz )
Operating System / Software
OS ProvidedApple MacOS X 10.3
SoftwareApple QuickTime, Apple Mac OS X Mail, GraphicConverter, OmniOutliner, OmniGraffle, Apple iCal, Art Directors Toolkit, Zinio Reader, QuickBooks for Mac New User Edition, Apple DVD Player, Apple iLife, Apple iSync, Apple Address Book, Apple Safari, Apple Sherlock, Apple iChat AV
Environmental Standards
ENERGY STAR QualifiedYes
Manufacturer Warranty
Service & Support1 year warranty
Service & Support DetailsLimited warranty - 1 year Technical support - phone consulting - 90 days
Environmental Parameters
Min Operating Temperature50 °F
Max Operating Temperature95 °F
Humidity Range Operating5 - 95%
Universal Product Identifiers
Part NumbersK9455LL/A, M9455LL/A, M9455LZ/A, M9455ZH/A



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