I have about the same setup, but can't get past 3.16GHz, even though the temps are low enough. Care to share your BIOS settings? I'm having a feeling I forgot something...
I was told that this could be because of the cooling paste that is not divided equally. I had this problem when I installed a Scythe Cooler: I put on too much cooling paste. I suggest you remove the cooling paste with alcohol (at least 90%!), and use Arctic Silver cooling paste... but not too much, you still have to be able to see through it. The result: my temps dropped at least 5°, and the difference between the four cores is 4° maximum!
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