Originally Posted by br3nd064
It's basically the frequency your fsb is at compared to the frequency your ram is at. A ratio of 1:1 is best for overclocking.
For example: My cpu is at 3.8ghz (9.5x400). The ram is also running at 400mhz, so this is a 1:1 ratio.
You might want to try and loosen your timings from 4-4-4-12 to 5-5-5-15 or 18, and bump up the RAM divider to 5:4 (DRAM:FSB). That will make your RAM run at DDR2-1000. Run the Everest Cache & Memory Benchmark to see what your bandwidth and Latency is at that speed. I can almost guarantee it will be more bandwidth and lower latency than DDR2-800 with 4-4-4-12 timings. 1:1 isn't always the best.
EDIT: Forgot to add, test for stability after running the benchmark (if the RAM is performing better, of course)
EDIT#2: I reversed the DRAM:FSB portion of my post. The ratio should be 5:4, DRAM:FSB. e.g, 500 RAM speed to 400 FSB speed.Edited by jimbo6846 - 9/21/08 at 12:31pm