Oh they're nvidia cards. To be specific they're gtx 1060s. And I just got to that site and in theory I can use 4 gpus but it's kinda risky.
The system without any gpus uses about 140w. And each card about 120w.
So (120*4 ) + 140= 620w.
And it should be able to handle 750w right ?
But I was told that I shouldn't try to push the PSU to the limit. So I'll buy another 750 or 850 one to be safe.
Yes, if they are 1060's with a single 6 pin connector, you can run 2 cards off one cable. I'm running an 8 x 1060 rig and I do 2 cards per power connector.
I also run the 1060's at 80% power since there is very little increase in performance above that so they're pulling under 100w each. I run 4 x 1060's, the motherboard, cpu, ssd, etc on an 850w, and the other 4 cards on a 750w. I thought I could do 2 x 750w but I had instabilities setting up the whole system when the cards are pulling the full power. When the power draw is decreased, people say 2 x 750w should be fine but the system is rock solid with an 850/750 combo.