This is a good powersupply that feeds 83 amps on a single 12v rail. No need to balance the separate rails.
Modular as well. I went modular and never looked back. My corsair HX850 came with over 24 wires, most which I don't use.
Acutally ignore what I said above. The stats looks good but apparently reviews said the power supply was bad.
Stick with the corsair, you can't go wrong and modular is FTW. I have a HX850 and love it.
Just remember the HX1000 has two 40amp rails. Feed the cards with a cable from one of each rail for 80AMPs of total power.