Mine needs 0.2v extra vcore to reach 3.2, I've tried several times to push it higher but always got lockups no matter now much voltage i blasted through the nb, vtt, vcore etc. I've now discovered that it was the ram, for some reason my Geil ram doesn't like running at it's rated timings even at 2N.

I will try to push harder again when I have time, now that I know it's the ram that was holding it back. It'll probably want super-lame timings to reach 1800MHz though