DDR2 Memory Timings

If you own DDR2 memory operating at 667 MHz with cas latencies 5-5-5-15 you should see an improvement if you set the operating frequency to 533 MHz and latencies to 4-4-4-12. Before you do that you should check if your memory support this speed and latencies. You can do that using 'Everest'. Everest is free diagnostics and benchmarking program running on Win32 platforms. In the page menu, click 'motherboard', then 'SPD' to get memory speed. Write it down on a peace of paper. It's a good idea to benchmark your memory with your original settings. To do that, you will need to click on the 'Benchmark' and click on the 'Memory read' and after that you will need to click on the 'Refresh Page' button, then 'Memory write', 'Memory copy' and 'Memory latency' respectively. Write down the results.Now restart you computer. Enter the BIOS and change your memory settings to 533 MHz and latencies to 4-4-4-12 :

tCL Cas Latency - 4
tRCD - 4
tRP - 4
tRAS - 12

Test your new memory settings with Everest and see significant speed improvements.
Also, you could try to change the latencies to 4-4-4-12 only, and set the operating frequency to 667 MHz. You should try this settings only if you have some better memory or if possible, try increasing the memory voltage to 1.9V-2.1V .

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