that's why i said "it could be" not that "it is", i know a friend who had a very weird issue and it was the PSU indeed. he ran Crysis, COJ2, RE5, Stalker perfectly, but FarCry 1 and 2, Grid, GTA4 and ARMA would not run stable for more than 2 minutes without either crashing or BSOD, otherwise everything else seemed perfect, desktop usage was stable and nothing out of the ordinary except the games i mentioned would just crash no matter what. lo and behold he removed the 700w psu and gave him an old 650w psu (lesser than what he had), the games that used to crash did not crash anymore, i left the psu for a week before he went out and bought an Corsair 800w psu and again everything worked great. so remember, just because something works does not mean it's working as it should, some games seem more sensitive than others, i have no idea why but its true. again i'm not saying his psu IS faulty, but it could be.