My rig have 6 rx588(samsung)
gpu freq 1200 mem 2100
voltage is 940 on gpu and mem

When i use claymore 10.6 eth+dcr
total hashrate : 183mhs on eth and ~5400 on dcr
1080-1100 watt from the wall

only ethereum mining

claymore 10.6
183-184mhs
850-870watt from the wall

phoenixminer 2.6
184-185 mhs
BUT power usage is
1200-1270 from the wall
Maybe this is realy fastest miner but it very expensive....