I gave a try this miner yesterday (usually mining xmr, but seeing the current eth profitability ...
).
The miner works ok, even though the power consumption increased a lot compared to XMR, but this is quite normal since ethhash is more power hungry than CN.
However i noticed that my primary adapter's speed is way lower the the other cards. All my cards are RX470 4GB, running at around 30MH/s while the primary GPU is runing at around 11MH/s (the same ratio can be observed with decred mining : ~380 vs 140).
I tried to lower the intensity, and to switch to mining only eth, no difference at all.
Any idea why?
(On XMR there the primary GPU performs less as well, but is only 10% behing the others or so)