Re: Mining difficulties when Ethereum goes to POS - What are you going to do?
I'm in ETH since 2016 and I kinda miss those good old days with 2 mined Ether a day. 
I've started with RX 390's and RX370 rigs.
Today I've one A10pro 500 5GB and still some old 13x RX480 (8GB versions) running - nearly 1GH/s. I'm going to replace them with RX 5700 or 6800 soon.
Here are some specs of the A10pro+ - which is actually a "customised GPU miner": https://www.whattomine.com/miners/126-innosilicon-a10-pro-6gb
With 1300 watts @ the wall the new 720MH/s version is not much more efficient than the 500 MH/s A10pro. Its like 1.9 watts/MH versus 1.8 watts/MH.
I've started with RX 390's and RX370 rigs. Today I've one A10pro 500 5GB and still some old 13x RX480 (8GB versions) running - nearly 1GH/s. I'm going to replace them with RX 5700 or 6800 soon.
Here are some specs of the A10pro+ - which is actually a "customised GPU miner": https://www.whattomine.com/miners/126-innosilicon-a10-pro-6gb
With 1300 watts @ the wall the new 720MH/s version is not much more efficient than the 500 MH/s A10pro. Its like 1.9 watts/MH versus 1.8 watts/MH.