Some Benchmarks:
RX 480 @1330 ~ 18 MH/s
MSI Radeon 380 4G ~6,5-7 MH/s
2x Opteron 6380 ~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?
You are already on an optimized AMD rx 480. Its just happens that nVidia now kicks AMD's ass