Did you order and the rig is up and running?
Do you have all psu connected to the motherboard? You were talking about 4 psu, but I thought the mb only needed 3?
Can the gpu draw power from the board or do you need powered risers? On the website it seems like enough to connect psu to mb.
Risers gets power from the psu AND gpu gets power from psu?
I've gone with 8 1070s and 2 850w. They just arrived haven't put them together yet. Can't answer your question yet.