For the 1 millionth time.
NO HASHRATE DOESN'T DROP EVERY NEW DAG. IT ONLY DROPS ON OLD GPUS LIKE 270X / 280X / 7970. [/b][/size][/color]
You are absolutely wrong.
Hashrate is dropping heavily for polaris cards 0.1-0.2 mhs every new epoch. This is stared 2 epochs ago. With epoch 199 you'll get only 17mhs with rx480. Just use --benchmark 199 option of claymore miner.
From my claymore logs
This is epoch #127
04:42:23:683 15cc ETH - Total Speed: 83.277 Mh/s, Total Shares: 119, Rejected: 0, Time: 01:36
04:42:23:683 15cc ETH: GPU0 28.012 Mh/s, GPU1 27.981 Mh/s, GPU2 27.839 Mh/s
Current epoch #129
13:40:17:925 708 ETH - Total Speed: 83.535 Mh/s, Total Shares: 76, Rejected: 0, Time: 01:09
13:40:17:926 708 ETH: GPU0 27.865 Mh/s, GPU1 27.900 Mh/s, GPU2 27.771 Mh/s
So it looks like it dropped about 0.05MH/s per epoch. So I retract what I wrote before.
However this isn't as bad as it was for Tahiti. Tahiti was like 0.15MH/s per epoch.
I have RX 480 Nitro+ 8gb and with every new epoch it drops by 0.2 mh/s.
I am currently mining ETC at 29.8 mh/s (epoch 131) but I can mine ETH at 30.2 mh/s (epoch 129).