I am mining Ethereum with Claymore's Dual Miner V10.5. I am getting a total hashrate of 75MH/s using three GPUs. However, whenever I try to overclock the memory using MSI Afterburner, the hashrate on one of my cards actually goes down to 25MH/s from 19MH/s. This reduces my overall hashrate to 69MH/s. Each cards normally gets around 25MH/s.
Here are my specs: 1x Sapphire RX470 4GB Mining Edition 1x Asus Duo RX580 8GB 1x Asus STRIX RX580 8GB Intel Celeron G3930 4GB Corsair Value Select DDR4 2133Mhz MSI Z270 Gaming Plus Corsair HX1200 Corsair ForceLE 120GB