a friend and I just tried to clock his Q6600 with a 750i board and it wouldn't let us pass 3.25Ghz. we tried FSB from 1400 to 1600 nothing worked past 1450 I believe it was.. he's stable at 3.2 ghz but can't get past that.. temps seem to be fine when the OS boots and allows some time to load speedfan LOL but then it just goes wack...we played with the vcore up to 1.5 and decided it was enough... kept his memory timings stock and still wouldn't work.. oh well!