GPU ethereum mining performance for 2018 (with watts)

GPU list with hashrate and power consumption

The next list provides hashrate and power usage for stock confgurations (without bios mod or overclocking).

Video Card Hashrate Watts
GTX 1080TI 8gb 32 MH/s 200 watts
Radeon Rx Vega 56 8GB 31 MH/s 190 watts
GTX 1070Ti 28MH/s 200 watts
RX580 8gb 25 MH/s 175 watts
Rx 480 8GB 24 MH/s 170 watts
GTX 1070 8Gb 27 MH/s 200 watts
RX570 4gb 22 MH/s 125 watts
rx470 4gb 21 MH/s 120watts
GTX 1060 6gb 20 MH/s 110 watts

With AMD cards the common practice is to mod the bios to improve hashrate, 480 culd go up to 29 MH/s (or more). GTX 1060 (6gb) could go up to 22MH/s. Also you can lower gpu voltage (for AMD) or lower the power limit (for Nvidia) to lower power usage and improve ROI.

Best GPU for mining in 2018