The fact that more graphically intense games make it worse made me think it was a cooling issue first. I ran a GPU temp monitor and saw that even with default settings the temp never exceeded 85ÂºC. I tried ramping up the fan manually and kept the temp under 70ÂºC but it still crashed. While I still had Aero (or whatever Win7 uses) on, it crashed once or twice just sitting at the desktop. I tried cooling the entire case more efficiently in case it was a motherboard component overheating but that did not help.
Right now I'm at wit's end with this issue. Immediately before getting this card I had purchased a Gigabyte 465. It exhibited what seemed to be the exact same issue, so I RMAed it. Before receiving the replacement, I noticed the EVGA GTX 470 on sale for less than I paid for the 465. I bought the 470 and sold my replacement 465. The fact that the issue happens across two OSes and two different cards suggests I have a driver problem, but I haven't found anyone else on the net with the same issue. It could also be a motherboard or power supply problem, but I can't afford a replacement for either unless I can determine that's the case. I do have an identical model motherboard from a different system but that's four hours away. I don't have access to any other components for testing. Does anyone have any diagnostic suggestions? Perhaps a way to test if the PSU is being overdrawn (it's not overheating) or some logs somewhere I can dig up? Like I said, I'm at my wit's end. After the new graphics card, I had hoped to keep the system as-is for at least another year and a half.