SO my p5KC should be able to do 450fsb, yeahy. Only problem is that I seem to need more V than you!. Clearly you dont find your board has massive V droop, i wonder why mine does
seems like an abundance of TIM in #202, imo. I'm not suggesting that this is the root cause, mate, but I'm not sure its helping. How's about trying the credit-card/razor-blade smoothing out?