Post
Topic
Board Hardware
Re: ANTMINER S5+ is available to order, 7.722TH/S 0.445J/GH
by
dogie
on 14/08/2015, 20:26:51 UTC

I don't think you can use only 2x PSUs. According to bitmain's product info
Quote
Do not connect more than one PSU to the same hashing board!

You can use as many PSUs as you want as long as you don't have multiple PSUs powering the same individual board (of which there is 9).