GTX 295 keeps rebooting my PC

[remanz]

I have the settings for "restart when encounter fatal error" unchecked in windows 7 though. I think that merely takes care of blue screen of death and it will halt the blue screen there instead of restarting the machine right away. It did not stop my system from restarting in this case.

I am not expert on this. But if windows is restarting, it can certainly halt the process and log the error somewhere instead of just cut my power directly. This looks like mobo or my power supply are restarting.

I have latest nvidia driver. The reason I said the GPU over heat was that when I OCed my GPU (Goddamn ff14), say from 590 hz to 700hz core clock, I get this restart the moment I open any game. I then set it back to stock clock. It is ok to play SC2/wow etc.