Seriously, could overheating cause this?

Does it do the same when you alt+tab?

 

It's sick, throw it in the trash and get a new one.

 

Sig worthy.

Nah, just don't alt-tab whilst gaming.

 

I don't know whether its related to NVIDIA, but when I have this random reboot thing I always check the POWER connectors to the various devices in the PC cabinet (including graphics card). Sometimes all it takes to cause such a problem is a loose contact in one of the power cables attached to any device, or even VERY small bits of dust in the area where the molex connector is located in your hard disks/graphics card etc.

No matter how good a PSU I get, I have always had to deal with this issue at least once with each PSU. Maybe constant/repeated plugging and unplugging causes the contacts to become loose....

For example, just recently I had 3DMark05 and Half-Life 2 crashing on me each time, with every driver. Turns out that cleaning the molex connector on the 6800GT and the PSU's molex wire fixed it....