Hi! I've faced with the following problem - my videocard AMD Radeon HIS 7850 IceQ X was overclocked to 1050/5000 and everything worked fine. But after re-installing my OS (Win7 64bit) I cannot overclock it again. I've tried all the OC utilities for the current moment (HIS utility, MSI Afterburner of various versions, ASUS GPU Tweak, EVGA Precision and built-in drivers GPU Overdrive) - nothing helps! Though in utilities frequencies are set to 1050/5000, all tests show that they are actually set to default 860/4800: