Hmm, have to remember, because my overclocking experience has been when EVGA GTX680 was just released. As your card is on H20 it should stay sub 70 C anyhow. If you use the onscreen monitor you can watch your clocks while gaming or benching. On air: I occed the clocks gpu/shader/mem for benching to the limit via Precision. Made a fan profil to keep it cool. Have a well ventilated rig. Played demanding games for hours. Benched for hours. Unigine Heaven or whatever. But there was no downclocking at all. Did you changed power management in Nvidia CP to maximum performance?