Yes, only with games, and once with Prime 95 and PC mark 8. GPU is OC'd out of box to 850 and 1200, i can lower the 850, but the 1200 I cannot. I have Cool & Quiet on to keep my voltage and muliplier from bouncing like it did without. I'm running it with Core Performance Boost so it runs avg. 3.6, but goes from 1400-3900. I upped the CPU voltage to just below 1.5v and the memory is at 1.6v . I'm not sure if the Mobo was designed for 1600Mhz Ram as it says 1333+OC on the gigabyte site, but on the RAM SPec sheet it says 1600. So IDK, started to happen more frequently once i upgraded ram. But during the test I had it at 1333.