But that's sheer overkill and because I didn't want that to be the issue. My bet is your issue is heat related. Try this simple test -> Leave the case cover off.
I built a PC using an Intel Mobo, 1GB ram, 2 HDs (1 IDE, 1 SATA), An Nvidia 6800 PCIE video card, 2 optical drives, and a 600 watt power supply.
The PC shuts off when I play Battlefield Vietnam (the only game on it). If I use Maya, no shut down.
I tend to think that 600 watts is enough. I also tend to think that BF Vietnam is much more demanding on the video card than Maya is, with BFV's constant refreshing of gazillions of polygons , textures, and physics.
What could be shutting my computer off? This is driving me nuts!