And with GPU 6 turned off nicehash crashed again 45 minutes after I left... UGH!! $4500 bucks in this machine and I've spent more on fuel going to restart it than the damn thing has made me.

It was running fine with 4 GPU's that were split between two 750w Corsair PSU's. They would only accommodate 2x 8 pin VGA plugs each so I replaced them with two EVGA 1000w and added 3 more GPU's.

So it looks as if the problem lies somewhere going from 4 GPU's to adding additional. 4G is turned on in the motherboard bios. I've swapped risers, I don't think they are the problem.