According to intel (bit-tech) article vdimm >1.65v is allowed as long as vdimm with within 0.5v of cpu vtt or what asus termed qpi/pll volts. So if you went by cpu vtt max of 1.35v, then vdimm 1.85v would be safe. But i'm seen some folks throuh max cpu vtt specs of 1.55v ?? so then vdimm of 2.05v would be max. Hopefully, someone clears this up eventually heh