So I recently upgraded my pc to 64 bit, and now my performance has been horrible. I checked MSI Afterburner and my GPU clock is going down to 50 MHz and Mem clock is 135 MHz. Anyone know how to fix this?
Are you checking during full load? if that's the case then it could be an overheating issue, wrong driver version or a power problem. Test your video card with Furmark and upload a screenshot of its state after a couple min running.