Problems with 3dcard or doom 3

One thing you could try is turning off VPU recovery...it might be turning it on as a trigger but could still run. If your pc crashes or something instead after disabling it, then it is overheating.
VPU recover is just there to reset the graphics card for some reason instead of it crashing the PC, but if it is triggering it when not exactly needed, do this:

Right click the desktop, go to Properties, then to Settings tab, and then Advanced at the bottom.
Go to the VPU Recover tab and disable it. Now test the game, and if no crashes happen then thats fine. If your computer crashes though and needs a restart, enable it again and then you'll need to get better cooling. But the fact it only happens on Doom 3 might suggest a problem with the game itself which is why disabling it might give an answer, and it being the most demanding game shouldn't matter... what graphics card dop you have? I'd guess it must be a ATI Radeon.

Have you got cooling on your pc? At least a fan spinning to blow air out, and one to blow air in?

Hope this helps
 
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