What performance level and strap are you using? Adjust VTT up and bring NB_GTLREF ratio down. Should help you relieve vNB somewhat. Anywhere from 0.56x -> 0.63x. Ratio is based on FSB_VTT.
I'm using 400 strap, PL6 & 438FSB at the moment and need 1.53V NB but PL7 only needs 1.39V with 333 strap upto 450FSB for moi. 400 strap, 500FSB and PL7 needs 1.57V-1.59V vNB.




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