DDR2 vs. DDR

Zoran ivanovi e-mail: zoran86zz@yahoo.com mail: www: http://zoran.110mb.com Skype: Zoran86zz Skype:

Old against new

New is bad or not. Is theoretically better can be and really better?

2/3/2008

Copyright by Zoran ivanovi

2/11 /11

What we have
Old DDR SDRAM vs. New DDR2 SDRAM Users are grieving over the good old past and the bad new present Can DDR2 be better then its predecessor?

3/11 /11

DDR2: Theoretical Basics
While DDR SDRAM can transfer data across the bus two times per clock, DDR2 SDRAM can perform four

4/11 /11

DDR2 has worse latency than DDR DDR2 chips have FBGA packaging it allows: better heat takeoff minimal electromagnetic interference between the chips DDR2 chips have a smaller power voltage and also smaller heat dissipation
2/3/2008 Copyright by Zoran ivanovi 5/11 /11

Low-Latency DDR2

The weakest aspect of the DDR2 technology is high latency Intel is approved of DDR2-533 DDR2with 3-3-3 timings in LGA775 systems. 3PCEnhanced Bandwidth Platinum with 3-2-2 timings in LGA775 systems.

6/11 /11

Testbed and Methods
We used the following hardware in our tests:

Processors:

Intel Pentium 4 550J (LGA775, 3.4GHz); Intel Pentium 4 3.4E GHz (Socket 478, Prescott core).

Mainboards: Mainboards:

ABIT AA8 Duramax (LGA775, i925X Express). ASUS P4P800-E Deluxe (Socket 478, i865PE). P4P800-

Graphics cards:

Sapphire RADEON X800 XT (AGP 8x); Sapphire RADEON X800 XT (PCI Express x16).

7/11 /11

Synthetic memory subsystem benchmarks:
Test ScienceMark 2.0 SiSoft Sandra 2005
Memory Latency Test ScienceMark 2.0
DDR 533 (2.5-3-3-8) DDR 400 (2-2-2-5) DDR(3-3-3-8) DDR(3-2-2-8) cycles 300
RAM Int Buffered Bandwidth SiSoft Sandra 2005
DDR 533 (2.5-3-3-8) DDR 400 (2-2-2-5) DDR(3-3-3-8) DDR(3-2-2-8) MB/s 6000

8/11 /11

Behave memories in real applications such as:
Data compression Computer game

WinRar 3.4

DDR 533 (2.5-3-3-8) DDR 400 (2-2-2-5) DDR(3-3-3-8) DDR(3-2-2-8) KB/s 600

Quake 3 (1024x768)

DDR 533 (2.5-3-3-8) DDR 400 (2-2-2-5) DDR(3-3-3-8) DDR(3-2-2-8) 412.2 409.6 416.3 420.500

9/11 /11

New is better
DDR2 SDRAM has become faster New i925/i915-based mainboard i925/i915-

10/11 10/11

Zoran ivanovi e-mail: zoran86zz@yahoo.com mail: www: http://zoran.110mb.com Skype: Zoran86zz Skype: Questions?