Associate
http://www.bit-tech.net/hardware/graphics/2015/07/10/sapphire-r9-fury-tri-x/10
Check that power consumption out.
Again poor overclocking.
I think a cheaper 980 with small oc would be the better bet.
The custom 980s with OC eats more again than the ref it was compared to...the 980G1 needs about 60W more than a ref...then comes the OC you mention and it ends up using about the same amount.