1.22v - 1.28v is all that is needed.
I run mine @ 1.28v 24/7 . I have also pushed the HTT to 294+...The Higher the HTT then this becomes a factor if you have drive instabilities using High or even meduim HTT of 250.
In fact the SB @1.28v is actully good if running lots of hardware (drives and two+ or more Vidcards.)
P.S. i know ,, i coulda edited the above.
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