I got my Asus Matrix 5870 back from RMA and I did some basic OC to it 990/5150. I ran Metro 2033 Fine I ran Cryostasis Fine. Ran COP Benchmark got a restart so I uninstalled that thinking it was the problem then I launched Crysis Warhead another restart then I ran Crysis Another Restart I checked file integrity via steam both ok. So I tried the crysis games on stock again and still get a restart. I thought maybe it wasn't getting enough power through my PSU (Even though the last one did) so I'm using 4 6 pin to 2 8pins converter and stil same crap.l Alien Swarm ran fine till I got Driver Stopped responding but I guess thats my OC even though Furmark ran fine with it. I did the proper Driver Sweeper driver removal to get rid of my old 3870X2 Driver and installed the latest ATI 5870 Driver. You don't understand how pissed I am. Can someone shed some light please. EDIT: DIRT 2 Restarts as well. I don't get a BSOD or anything just plain restart and this when I boot back up again.