Hello,
I'm sorry n00b here...

when i'm using single mining I got 27mhs on my rx470, but on dual mining eth dcr I got only 19mhs.
I notice it from GPU Z , when i'm mining single eth gpu core is on 1050mhz ( which i'm downclock it into ). but on ETH+DCR it only run 700mhz....

I got 2 cards behavior like that...  the other 5 is fine...

2 cards who got odd behavior is biostar and sapphire.
my downclock is

1050mhz, 2000mhz @ 860mv

I'm using claymore 10 and 9.8 on nicehash