1.66vNB I think(not sure it was needed, it was working best with 1.54v at least for stability tests), 1.5-1.54 VTT, 1.3pll. I think with more serious play the CPU will do 6ghz(8x750), at least for validation . CPU Vcore was a little high also, it can do 5.5ghz 1.56v validation on SS, but wanted to be sure it's not the CPU and also this board needs more Vcore compared to DFI P45 T2RS PLUS.