My RX580 with Samsung MEMs (not possible overclock too much) take about 31,5MH/s with 90W and max 60°C.
Yes 90w in software reading, real over 120w i think.
Yes, it is SW reading from GPU but that rig have 3 x RX580 and from the wall take about 370W.
It mean that one card take about 100W from wall and CPU+MB about 70W.