I got a good friend of mine throwing me 1600w p2 for good deal and I will be using this to power possibly 7 GPUs. I am looking at the ports on the PSU now and I see only 3 sata ports, and 1 perif, 1 perif/sata ports. (https://www.evga.com/products/images/gallery/220-P2-1600-X1_XL_5.jpg)
Now I have 7 GPUs to power with risers so I am puzzled on how to do this.
First of all, are perif and perif/sata ports all same ports with same voltage as sata ports? so do I technically have 5 power ports?
Second, this PSU comes with 6 pin power to sata (http://imgur.com/a/hpRO4) so should I power 2 sata risers per cable with this?
Third, How about if I connect 2 GPUs directly on the motherboard (then powered by motherboard right?) and get only 5 risers each powered by only one 6 pin to sata cable instead of splitting the power? Would my motherboard be okay powering 2 1070s?
I know this can be hard to understand but please give me some advice. Id appreciate it.