I've been using Corsair 1000W supplies since I first started mining. I dual mined Eth + Siacoin / Decred and found the PSU pushed to the limit with 6 RX480s.

I've since stuck with mining Eth-only, but I'm building some new rigs for mining (6 RX470 4GB cards) and want to explore dual mining again. For dual mining Eth + second coin, is 1200W power supply enough?