I did a quick math and it appears the 1060 is a real champion
in the Hash for watts race:
Numbers are approximate,
depending on the make and luck:
RX470 - 115W- 26Mhs = 0.22mh/W
Rx480 - 130W - 29Mhs = 0.22
RX570 - 115W - 29mhs = 0.25
Rx580 - 130W - 30mhs = 0.23
Vega56 -200w - 37mhs = 0.18
Vega64 - 220W - 40mhs = 0.18
1050Ti - 65W - 15mhs = 0.23
1060 - 80W - 24mhs = 0.30
1070 - 110w- 30mhs = 0.27
1070Ti - 130W - 31mhs = 0.23
1080Ti* - 200w - 50mhs = 0.23
*(with ethlargement)
Great to see some real data. I've done the same calculations but i'm sharing relevant statistics based on actual experience (i've owned the GPUs i've listed below):
RX 470 - 110W - 27 MH = 0.245
RX 480 - 120W - 28 MH = 0.233
1050TI - 65W - 14.5 MH = 0.223
1060 - 95W - 23.5 MH = 0.247
1060 - 120W - 30.5 MH = 0.25
So really, the 1070 is the real winner. Other GPUs i also have but haven't listed because they probably have no business mining ETH at all anyway.