Sorry to bring up an old thread but just thought id say i got upto 4ghz and stable yay lol, i did buy MX-3 in the end and it knocked off 8-10c off load temps enabling me to up my cpu voltage up abit to get to 4ghz.
You had AS5 on before? i got that too....wondering if i should do the same or try my Megahalems paste which is very good aswell as i am not that impressed with AS5.(supposed to be 2-5c less after 200 hours of use but that takes an awful long time i heard

I run mine at 1.28v, QPI at 1.32, ram voltage at 1.65v and IOH on auto.(should set this really to 1.2v or something although i passed Burntest on these settings or would it not matter/alter temps much?)