Im using a Asus dc2 4g rx 470 gpu to mine ethereum. At stock i get around 18mhs with overclock i get 20mhs this is low compared to other post with people getting 20-24 mhs stock. Im using drivers 16.9.2. Any advice on how to up the hashrate. It has Elpida memory. I've heard this can get up to 31mhs, Im just happy with 25mhs if anyone could help.