Ive been experimenting with ratios again as well. Now that its getting hot outside, I decided to switch to my "summer overclock" so I dropped my fsb to run my e6600 @ 3.0 instead of my max 3.4. Running at 3.0 actually underclocked my memory lower than the maximum recommended 400Mhz with a 1:1 ratio, so I moved up to ref 266 and mem at 667. Now my memory is a 4:5 ratio, running at 417 MHz and completely stable. I havent done any benchmarks, but I would assume that since my memory is mildly overclocked now instead of underclocked my system should run a little faster. Or I could be totally wrong.