I am going to 2nd geekapproved's thought. Most people can hit 4GHz at stock voltage with no problem, it is much more likely the fact that you have 4 dimms of ram, which can be problematic at high frequencies. Upping that voltage a little bit may fix your problem.
Though you may have just gotten 'lucky' and received a dud chip, which does happen, but it is rare.
I ran prime 95 for about 5 hours stable no BSOD this time, I changed the settings to offset mode from fixed and lets the motherboard just adjust it. Temps were 55-60 on 100% load at 4.0GHZ. Vcore fluctuated from 1.277-1.31