err, I don't think that u understood what I mean -
Oldcomer's mod with blockchain is 1220 GPU clock, using around 1400W for me -> around 220W per card.
1000 GPU clock with 17.8.2 was using only 1100W. -> 170W.
The voltages that the cards were using with the 17.8.2 and underclocked were under 0.9. I think it was 0.875mV
But someone in the thread (if I am not mistaken it was you), said, that he can mine ETH with Oldcomer's mod at 150W per card. And this is the part that I seriously doubt, as my numbers are pretty different, and I single card, that its not modded the same way as in the mod cannot make 400W difference. If the 150W part was true, the whole system would draw only 1000W.
P.S. And I am still using the mod as we speak. 261 MHs ETH, very stable (as its night and its better for the cooling of the cards), they seem to lose a few MHs when temps hit 65.
I repeat again. When mining with Oldcomer's mod run gpu-z or hwinfo64 and check voltages for every card. It should be ~820mV. If not - you've messed something.
With Oldcomer's mod Vega should take ~170watt mining eth at 44mh/s
0.83-0.85V except one that needed a bit more to be stable, so I adjusted it manually and its around 1. But all 5 are running at 44 MHs. The 6th , where the mod was not applied is at 1.05, runs at 1100 Mem, but the gpu clock is not stable so its ~40.5.