I made this spreadsheet for deciding what to build out my farm with. Some will say results will vary, but this is what I have measured FROM THE WALL. By far the most efficient is A10 but a very close second is the 5600 xt. The cheapest MH/$ is still an RX 470-8gb. Hopes this helps.

PS: Don’t buy Gigabyte 5700 xt They have security checks that currently do not allow them to be modded. Reports of the Same thing on Strix models but i haven’t confirmed.

Card Spreadsheet