@EdwardCeng
Yes, I use mainly RX 470, 570, 580 and they are either 4GB or 8GB. These are best for ETH or ETC.
Electricity is still cheap. The average cost for each rig is $88, including electricity, 24/7 monitoring, maintenance (dust cleaning)
@gameboy266:
We have a small power station, support up to 300 rigs.
What is the electricity cost? in $/kwh?