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)
good to hear,
yeah, RX series is the best in ETH/ETC with the price is not too expensive. I have a few rigs but not as many as you have, whether with such a mining rig is still profitable today or we can call that profit decline.