Our testing methods
We've tested several different memory configurations to illustrate the performance impact the key memory timings settings, including DRAM command rate. Tests were conducted with a set of low-latency OCZ DIMMs rated for 2-2-2-5 timings at 400MHz. We also tested with 2.5-4-4-8 timings to simulate the performance of more affordable "value" memory. Some budget memory is rated with CAS latencies as high as three cycles, but since CAS 2.5 memory is already quite affordable, we've limited our testing to CAS 2 and 2.5. In addition to testing system performance with 2-2-2-5 and 2.5-4-4-8 memory timings, we've also tested each configuration with both 1T and 2T command rates.
All tests were run three times, and their results were averaged, using the following test system.
|Processor||AMD Athlon 64 FX-53 2.4GHz|
|System bus||HyperTransport 16-bit/1GHz|
|Motherboard||DFI LANParty UT NF4 Ultra-D|
|North bridge||NVIDIA nForce4 Ultra|
|Chipset drivers||ForceWare 6.66|
|Memory size||1GB (2 DIMMs)||1GB (2 DIMMs)||1GB (2 DIMMs)||1GB (2 DIMMs)|
|Memory type||OCZ PC3200 EL Platinum Rev 2 DDR SDRAM at 400MHz|
|CAS latency (CL)||2||2||2.5||2.5|
|RAS to CAS delay (tRCD)||2||2||4||4|
|RAS precharge (tRP)||2||2||4||4|
|Cycle time (tRAS)||5||5||8||8|
|Hard drives||Western Digital Raptor WD360GD 37GB SATA|
|Audio driver||Realtek 3.75|
|Graphics||NVIDIA GeForce 6800 GT with ForceWare 77.77 drivers|
|OS||Microsoft Windows XP Professional|
|OS updates||Service Pack 2, DirectX 9.0c|
We used the following versions of our test applications:
The test systems' Windows desktop was set at 1280x1024 in 32-bit color at an 85Hz screen refresh rate. Vertical refresh sync (vsync) was disabled for all tests.
All the tests and methods we employed are publicly available and reproducible. If you have questions about our methods, hit our forums to talk with us about them.
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