I've got 7x 1070's running in my rig also. I'm using the blue version 006c 6pin risers. I set mine to "gen1" pcie. does gen1, gen2, or gen3 work better?
I currently have 7 gtx 1070 running and am just waiting on the 8th card to arrive. Thanks to those who posted on this thread as I read all of it before getting my rig to run last weekend!
It's currently using two evga cards, two msi cards, two zotac cards and one asus card (with another asus card coming). It just sort of worked out in pairs as I purchase four cards used and four cards new from Amazon.
915 Watts. Less than I expected.
http://tohktohk.com/pics/killawatt.jpghttp://tohktohk.com/pics/afterburner.jpgJust need to make sure everything is stable before doing some cable managing.
http://tohktohk.com/pics/fans.jpg 
