1000 watts gold rated and 10 connectors. Wont have to worry about any molex or SATA to run 4 cards and wont have to worry about coming close to max power on my 850. Ill just sell my 850 to recoup some of the cost and have the piece of mind that Im safe when Im not at home.
Or keep your original psu for your motherboard and risers and run your gpus off a good server psu from parallelminer.com that's what I did just a suggestion