It sounds like your PSU is at fault.
I agree with Azimuth... What power supply are you running because when installing a new GFX card you have to take into consideration the amount of power hungry resources your card is going to use...
have you tried reinstalling cod4. Did you reinstalled windows. Also try getting the latest drivers at www.guru3d.com they are the best works great for me and I'm running a Geforce GTX280 with the latest drivers. to monitor you temp use the latest gpu-z.
if you can load that app and give us the temps for gpu and also the memory. maybe the memory is overheating.
I am using a Vantec ion2+ 620w.
Yep. I have re-installed Cod 4. and the same also happens with Modern Warfare 2. Last night I played Modern Warfare 2 with everything on Max except the res.
I played Borderlands for an hour and a half with everything in full and works fine. Also Played Street Figther IV on Max for about +-40minutes in the weekend and worked fine. I will install gpu-z tonight.
I started with new profile and the same occurs. I installed GPU-Z. How would I know if my GPU temperature is too hot? The sensors are on, and if their is a crash it should write to the log file?
Here a screenshot of current temperature:
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I think I am going to take the PSU back to the store. or maybe take my PC and try another PSU. Both the PSU and GPU are new in my PC. Maybe one of the two is faulty.