I got ram similar to that this stuff to be exact and i currently have it at 236fsb 1:1 ratio at 2.5-3-3-5-1T with 2.7v in the bios and stable in memtest havent tryed for highter since i think my cpu is about maxed but im happy with it; and IMO pc4000 with 3-4-4-8 timmings i dont like, personal preference, since if the sticks dont clock up to there rated speed you have no room to loosen the timings to get to the rated speed or above.