I had the same problem with my NB heatsink( getting 54-60c), I had to flip it around 180 degrees but now my Enzotech xUltra120 wont fit that way so i'm not sure what i'm gonna do.. Pwm get scary hot also use caution ! Prepare to spend some more $$$ on this already expensive hot board.

Honestly rather replace my DFI 680lt then my Enzotech but thats just cause i havent been having much luck with this board.