Can anyone help with settings for undervolt please? I had a nice 975mV that I got from this thread once but now can't find it. It was faster than stock and only pulled 170/200W.
Until AMD fix the clock discrepancy between Windows Fast Start Up being enabled and disabled, which translates to 25 MHz higher clocks when disabled (or just after a system restart), it's pretty difficult trying to provide accurate and stable under volt setting.
However, assuming Windows is in the default state, i.e. Fast Start UP enabled, the following should provide good results.
Also, note that Vega voltages actually increase in 6.25 mV increments, and entered voltages just revert to the closest actual number at or above the figure entered. In the above scenario, actual voltages would be 950 mV, 956.25 mV, 962.5 mV, 968.75 mV, 975 mV etc., so 970 mV translates to 975 mV actual.