its funny...when i had my sli 7900's, i used to clock the crap out of them and when i would be in a hard scene in bf2 i'd get this like wierd stutter in the sound...and i would be like, "here it comes" and sure enough, 15 seconds later crash bf2.
lol its funny cos all stability tests said OK...but that would happen. its the only game that did that, too. wierd.