what is your temp? have you tried to turn the fan speed higher to keep it cool?
Originally Posted by AC_Smoothie
If wat he said doesnt work, then try reinstalling the drivers. Don't forget to use drivercleaner.
If still not working then try re-seatting the card in the PCI-E slot by taking it out and reputting it back in.
If all fails, then i recommend a reformat, it can work miracles.