I was referring to his GB UD5 board/bios which is nearly same as my extreme ...but that is interesting nonetheless, I never heard of any boards dropping vcore with C1E once you manually overclocked. Which board do you have? I would consider using C1E if it downclocked both the vcore and mhz on mine (providing it did not cause instability doing so), but all it does on mine is drop mhz...I would think it would cause system stability problems if vcore dropped too much, since mhz bounces around so much.