I've lately been playing Battlefield 3 again, and Assassin's Creed Revelations, too, as I finally got the crack to work properly. Yes, I'm a filthy pirate, hang me. Point is, after a while of playing (it differs every time) my computer shuts off, as if the electricity was cut off. This is, however, not the case because the light that's connected to the same socket (it's one of these) still works. When it happens, the music/sound stops; my monitor shows me it's not getting input from HDMi. Also I hear the fans powering down. What bugs me about this is that this did not happen at all with MW2 back when AlterIW still worked, and Minecraft doesn't trigger it either. Assassin's Creed 2 and Brotherhood used to run fine also. I'll try and run some benchmarks and then report back if it happens.