Originally Posted by igyman
Unfortunately I've discovered a problem and I don't know the cause - while playing a game (any game) the PC may at some point simply reboot.
I had somewhat similar problems with the graphics card in my old computer initially. It would just shut down the image on the screen or restart the computer on its own every now and then when playing games.
It my case the problem turned out to be an old version of the BIOS/firmware on the motherboard. After flashing the BIOS to the latest version downloaded from the motherboard manufacturer's webpage all those problems vanished. Don't know if it's the problem in your case, but might be worth checking up at least.