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?
what drivers/OS are you using to het the rx 480s working? the miner cannot see them for me

Win10 64bit, last Driver 17.7.1. The Reddevil is on 1330Mhz@1,11V, 2200Mem and I=22.
It just worked or you have done some additional settings? any config you can share and which miner version you are using?
It's the miner, that linked on page 1:
The Batchfile is simple:
"setx GPU_MAX_ALLOC_PERCENT 100
sgminer.exe -k skunkhash -o url -u xyz.xyz -p x -I 22
pause"
That's it.
But my 380 is a little bit poor, i think.