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first of all, this could be due to an overheating issue with the card. i would look at the video card fan first to see if it's spinning properly, or spinning at all! also, check for dust bunnies. if they're plentiful, take out the machine and blow it all out!
that'll give you a place to start with what you've given us, but to help you out a bit further, give us a detailed list of your system specs .