Thank you for a suggestion, I tried it ;] set -dcri 50, upped to 60 soon after, achieved ~1400 Mh/s for decred, but Eth went down to ~47-51Mh/s with 25W more for 2 RX 480.
What is your setup and numbers with and without second coin mining? If you would -,-
I'm not dual mining at the moment but I was running 144 mh ETH / 5700 mh DCR. (6x rx 480) Don't remember the different watts but according to what to mine that was the sweet spot for me. Of course this was before ETH hit an all time high. I'm sure whattomine would say solo mining ETH is best right now.
I find that about 30% intensity on DCR is just about maximum before ETH rate is reduced. I think dual mining is still slightly more profitable.