On a sidenote, I've got my two 7-GPU rigs (RX 570's) hashing away and they're only sucking a combined 2200W at the wall. Quite amazing considering my 6x R9-280X rig used to draw almost the same amount of power on its own back in 2014...

what mother board does 7 GPU now ?
Asus Z270 Prime P can have 8, And Z270-A 9 gpus.
On a sidenote, I've got my two 7-GPU rigs (RX 570's) hashing away and they're only sucking a combined 2200W at the wall. Quite amazing considering my 6x R9-280X rig used to draw almost the same amount of power on its own back in 2014...

That's horrible. I have 2x RX 470, 1x RX 480 cards and 1x R9 380 (need update but there are no AMD cards...) with 560W at wall. Also I mine XMR with STAK, but when I use Claymore I have 100W more from wall with about same hashes
