Sounds like a power setting. Or Power Play. Or Power Tune. Or Zero Core. Do you have your PC set for 'High Performance'? or 'balanced' ? There is a post here that has some info. Google the above terms if you don't know what they do. For better responses, furnish the information asked for in "PLEASE READ BEFORE POSTING.
Intel I7 960 @ 3.87ghz *Intel DX58SO *HIS HD6970 2gb *Corsair TX650M *2x4gb Corsair XMS3 *WD Black 1TB *Windows 7 Home Premium 64bit *Gateway HD2401 24" 2ms 1920x1200 ***Asus N71Jq laptop *Intel I7 720QM Processor *Mobility Radeon HD5730 1gb *8gb Ram *Windows 7 64bit
* A clear conscience is usually a sign of bad memory *