what hashrate on 270x, 280x, 290, 290x, Fury?
my
radeon 7950 (sapphire, 925/1250) - 3500
radeon 7950 (xfx, 950/1375) - 4300
radeon 280x (gigabyte, 1000/1500) - 4300 (bin-file from 7950)
mining at 4mh/s with 7990 ( hash rate per GPU) at 1020/1500
13.12 catalyst, 7 ultimate.