I've gone through Asus p6t, Biostar and EVGA, Biostar proved to be the best overclocker with my chip. I could get 4ghz easily on Biostar but with EVGA, chip tops out at 3.8... I dunno why but I suspect the extra molex connector on biostar mobo has something to do with more stable voltage, EVGA vdroops like crasy (I'm a chicken to enable 'withoug vdroop', lol). I'm watercooling, btw