From a month ago all R9 390's have hash rate 27Mh/s on Ethereum
I tried reinstall with win10 1709 and 15.12 amd drivers.... no change
When I switch to musiccoin everything is OK hash rate back to 31Mh/s
The only deference is EPOCH of the coins.
I have no idea Sad
maybe you should try to update to the more recent Claymore version?
according to ethermine: "Old Claymore miner versions do not support mining after DAG epoch 200 which just passed with #Ethereum block 6000000"
also I'd suggest you check out PhoenixMiner 3... btw
@Claymore what do you say about those guys? looks suspiciously similar, but produces way less stales and gives a better hash overall