You need to set voltage manually, not just let the motherboard guess what voltage is needed for a given overclock.
1.39v is very very high. 1.3v - 1.35v is probably the maximum you would want to run 24/7. some might go up to 1.4, but you take your chances then, and you would expect a lot more than 4.4GHz at that voltage.
1.39v is very very high. 1.3v - 1.35v is probably the maximum you would want to run 24/7. some might go up to 1.4, but you take your chances then, and you would expect a lot more than 4.4GHz at that voltage.