** Official ** Gigabyte UD3 P45 Series -- EP45-UD3 / EP45-UD3R / EP45-UD3P

[Capt Proton]

Ive read the same on the q9650 you should never need more than 1.24 to 1.30
to push past 4.0 except on some older boards like my DFI UT P35-T2R which where really designed for the dual cores 65m and 45m and really only designed to push the q6600 on a high vtt because of the boards high vtt requirements towards high fsb

VTT = 1.2V - 1.3V = Up to 400 FSB

VTT= 1.4V - 1.55V = 420-440FSB

VTT=1.6V = 440-475FSB

OK. First of all, i trust you are not saying that you would use those VTT values! Common is .05 - .1 below CPU Voltage.
as well, hope you realize the values expressed in ET 6 for CPU Ref anf MCH ref are not the true values, They are the values in relation to stock VTT. So, if ET 6 is reporting .785, that is .785 if VTT was set to 1.2. as you raise the VTT, the ref values go up, but Easytune does not show this. More info here.