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 
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 Where you found this driver for Windows 8.1? On AMD website i found just for windows 7 and windows 10.