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.