But if you pay for electricity then air cooling is ok, even rx vega 56, just run at 130-160watt and forget about dual-mining.
I have no vega 56 yet but I see no problems in flashing it with vega 64 bios and apply proper tuning then.
Thank you so much, my 56 now is doing 1585H/s. Previously it did only 1275 Max. This is with the blockchain drivers, and 64 bios flashed.
+1 to liquid cooling for vega, this card likes to throttle above 70, while it obviously isn't for mining farms, my pc will love 2 vegas on cooling.