CPU only at this point, from 3.5 stock to 4.5, and able to do so on air thankfully. GPU is rated for 1170, but turbo's to 1228 on it's own and I've yet to find a need at 1080P to need to clock it up anymore than it already does...yet. I had an HD5870 for over 3 years that I recently sold, never clocked it once....ran great and was able to maintain good temps (was the XFX Rev 2 with the center fan). Probably the only GPU I never OC'd. This 770 will see some OC action soon I'm sure.