Tryid it on 280x
Got 12-13mh per one(8.1x64, cm9.

...nothing change from 15.12 driver. Stupid amd didn't applied their fix to truly good cards

Yeah if they fixed it on the 280x we would be getting 28MH/s with those old GPUs, but they only fixed it for the GPUs that they are currently selling. Greedy bastards.