Some Benchmarks:
RX 480 @1330 ~ 18 MH/s
MSI Radeon 380 4G @1050 ~6,5-7 MH/s
2x Opteron 6380@2500 ~1,2 MH/s
R7 1800X@stock ~0,9 MH/s

Is there a an better optimized miner better than the linked one available for Radeons?