You could try to bump the memory voltage up and see if that helps you will have to get one of the uber bios to get 2.9v though. But you probably won't get your cpu mhz up to much more since the Asus mobo only gives you 1.85vcore to play with you also might try bumping the vcore up a little more and see if that helps make it prime stable just watch your temps.
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XP3000@2896
Abit NF7-S
9800pro
2 Raptors raid 0
Corsair 3500
