JohnLoph: I would try bumping up the vcore and going with 200x21. Also you seem to be running hot. once I got 200x20 stable it was just a couple of tweaks to get 4.2ghz out of my chip. This is plenty fast for me I just came off a E8400 3.8ghz so this feels blazing fast for me. Does any1 think the voltages I'm running will damage in a couple years time? But by then their will be better boards and better prices.

I've also switched to the F3 bios.

I think someone should to start a X58A-UD3r thread.