I have the weirdest problem -- I'm finally able to unlocked the two extra cores on my Phenom II X2, and it boots and runs fine, as far as I can tell. I can encode video much faster, it doesn't run that hot, and it's stable on Prime95 (for the couple of hours that I tested it). Except that the minute I try and play a game, doesn't matter which one, the game crashes after about 10 seconds (or, for instance, in a game like Mirror's Edge, whenever I try to fire a weapon or jump over a box or something). At first I thought it might be my drivers or video card, but couldn't track anything down, so I tried disabling those two extra cores, and everything's fine. I know it's always a gamble when it comes to unlocking cores, but why would they only cause stability issues when playing games? What CPU functions are used then that aren't used on something like Prime95, for example?