Struggled for days to get the AMD cards working on ethos, finally nailed it.
My GTX 1070 cards (using pimpos) outshine the fastest 480/580's I have by a factor of almost 2 x . The RX 470/570's do 12-13mh/s.
The best I get with RX580 is about 15 mh/s (power level 5) GPU clock 1180, mem clock ~1950-2000, the gtx 1070's give 26 mh/s at 130W TDP with -I 21 and memclock + 1150.
Would be interested to hear what can be done to improve, but with the coming halving in about 5hr, wonder if it will still be worth mining this.