Radeon
Contributor
Desecrator is correct, I had built one computer for one of my clients almost an year back with ATI Radeon 4870 with plenty of fans (Almost six now 120MM), the power supply was Cooler Master 600W Extreme Power and he used to a complained lot of PC being shut down automatically, freezing and all and finally it blew up within six months. I got him 1000W Real Power Pro and even added more fans to it, now it has been working absolutely fine.