Push that cpu - nb voltage to 1.3, should stable her out. As for the TIM application, use a pea size dot in center, then an old credit card to smear thin across whole IHS, the heatsink will do the rest. Be sure to apply a little pressure once the mounting screws start to set, and don't let it move! It'll be as perfect as you can get, basically.
btw, I wouldnt go ruining my AMD cpu with an INTEL BURN IN test. You're degrading your CPU for no reason, and most stress tests are Intel oriented, which is why your CPU is stable Prime95 and not for the intel burn test. I completely quit running stress tests for my CPUs when I noticed degradation in the IMC. When your RAM OC is stable for 3 months, then not... Then you get it stable a bit lower then before, and 3 months later again its not... Thats how you know.
Ooh, the Nb voltage doesnt seem to good either. Give it 1.3 also, and oyu should be bale to do 2800mhz no prob, mebbe even 2900 or 3000... and turn off spread spectrum... I keep seeign stuff that helps, Edited by SwishaMane - 1/2/12 at 9:03am