when i mine only ETC i get 26mh/s single rx 470
if dual mine etc+dcr only 20 for ETC and 600 in DCR
is that normal
You can adjust the secondary coin intensity with the +/- keys while dual mining. Once you find the best intensity that maximizes the hash rate of the second coin without lowering the ETH hash rate, you can set it in your command line or configuration file with the -dcri parameter.