Guys, I'm having problem with Ocing my 2500k, the thing is, no matter what Vcore - voltage I put in the BIOS(for example 1.315v for 45x - Fixed Value), when I run prime or some any heavy benchmark soft, my real vcore is always drop to 1.2xxv + the multiplier fluctuates from 41x to 45x ( monitoring with AXTU). I've disabled Speedstep, Spread Spectrum, PPL set to 1.586 and the rest are on auto.

This is really annoying then, need some help guys.