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Test Settings: Lowest Stable Latencies, Continued

Though hard drive performance isn't expected to improve the scores of our chosen benchmarks, using a 10,000 RPM part certainly won't hurt these. Western Digital's ancient 150 GB Raptor remains the top part.

Latency Test Benchmarks and Settings
3D-Games
F.E.A.R Version: 1.0 Retail
Video Mode: 1024x768
Computer: Medium
Graphics: Medium
Test Path: Options/Performance/Test Settings
Quake 4 Version: 1.2 (Dual-Core Patch)
Video Mode: 1024x768
Video Quality: default
THG Timedemo waste.map
timedemo demo8.demo 1 (1 = load textures)
Audio
Lame MP3 Version 3.97 Beta 2 (12-22-2005)
Audio CD "Terminator II SE", 53 min
wave to mp3
160 kbps
OGG Version 1.1.2 (Intel P4 MOD)
Version 1.1.2 (Intel AMD MOD)
Audio CD "Terminator II SE", 53 min
wave to ogg
Quality: 5
Video
TMPEG 3.0 Express Version: 3.0.4.24 (no Audio)
fist 5 Minutes DVD Terminator 2 SE (704x576) 16:9
Multithreading by rendering
DivX 6.6 Version: 6.6
Profile: High Definition Profile
1-pass, 3000 kb/s
Encoding mode: Insane Quality
Enhanced multithreading
no Audio
XviD 1.1.3 Version: 1.1.3
Target quantizer: 1.00
Applications
Autodesk 3D Studio Max Version: 8.0
Characters "Dragon_Charater_rig"
rendering HTDV 1920x1080
Synthetics
PCMark05 Pro Version: 1.1.0
Memory Tests
Windows Media Player 10.00.00.3646
Windows Media Encoder 9.00.00.2980
SiSoftware Sandra 2005 Version 2005.7.10.60
Memory Test = Bandwidth Benchmark

Talkback

dv8silencer 05/07/2008 2:45 AM
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dv8silencer
I have a question: on your page 3 where you discuss the memory myth you do some calculations:


"Because cycle time is the inverse of clock speed (1/2 of DDR data rates), the DDR-333 reference clock cycled every six nanoseconds, DDR2-667 every three nanoseconds and DDR3-1333 every 1.5 nanoseconds. Latency is measured in clock cycles, and two 6ns cycles occur in the same time as four 3ns cycles or eight 1.5ns cycles. If you still have your doubts, do the math!"

Based off of the cycle-based latencies of the DDR-333 (CAS 2), DDR2-667 (CAS 4), and DDR3-1333 (CAS8), and their frequences, you come to the conclusion that each of the memory types will retrieve memory in the same amount of time. The higher CAS's are offset by the frequences of the higher technologies so that even though the DDR2 and DDR3 take more cycles, they also go through more cycles per unit time than DDR. How is it then, that DDR2 and DDR3 technologies are "better" and provide more bandwidth if they provide data in the same amount of time? I do not know much about the technical details of how RAM works, and I have always had this question in mind.
Thanks
Deleted profile 06/27/2008 2:08 AM
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Latency = How fast you can get to the "goodies"
Bandwidth = Rate at which you can get the "goodies"
Deleted profile 06/27/2008 11:23 AM
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So, I have OCZ memory I can run stable at
7-7-6-24-2t at 1333Mhz or
9-9-9-24-2t at 1600Mhz
This is FSB at 1600Mhz unlinked. Is there a method to calculate the best setting without running hours of benchmarks?

Note You are going to post a comment as anonymous.