R9 Fury here !
Claymore 12.5 (-asm 1 -a 2 -i 5)
Driver 15.12
400-430H/s with powerlimit -50% (125w)

It's important to stick with those drivers, that is the best perf I got.
(With newer driver, I can't activate the ASM option, with give me around 340 H/s for the same powerlimit)

Here my dashboard : http://www.monitorig.com/#?panel=dashboard&id=1086db9224632d26671ab42df5ee1d92bf0187bbdd