To start things off I am new to overclocking so be gentle with extra lube. I am prime95 stable at 4.0 running blck at 200 with a 20x multiplier and tried to up it to 21x for 4.2 with no avail. Temps are not the issue at this point, prolimatech magahalems with push-pull, but voltage. I have increased vcore voltages up to the 1.5 something in the bios were the numbers go red and all others are on auto. The memory is on an xmp profile with the multiplier at 10x, it is 2000mhz rated memory. If I have to go to some insane voltage I am happy at 4.0 but if I am missing something let me know.