Memory run 1066 if you have everything on stock
But 1600 its enough for 4ghz, but what did you sett on the vtt-volt?
I running UD4P with F8 bios and running 4ghz on 1,2v vcore and 1,27vtt. The same settings on F7.
Did you remember to sett qpi link speed to X36 and sett Uncore to 2+1 ( if you have choose 6 on the memory you have to set 13 on uncore)
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