I am fairly new at this and have been reading a lot to get up to speed. I have my first rig set up with two RX580 Red Dragon cards (needless to say I should have bought 3 since my plan was to build a trio).
I have the system running pretty smooth with smOS. I am dual mining Ethereum and Sia. One of the cards is not performing as well as the other. Purchased from the same retailer the same day. Probably doesn't mean anything and could still be different chipsets.

Here is what I am currently getting:
ETH - Total Speed: 56.308 Mh/s, Total Shares: 1141, Rejected: 0, Time: 11:18
ETH: GPU0 26.916 Mh/s, GPU1 29.392 Mh/s
SC - Total Speed: 1126.154 Mh/s, Total Shares: 321, Rejected: 0
SC: GPU0 538.314 Mh/s, GPU1 587.840 Mh/s
GPU0 t=64C fan=60%%, GPU1 t=58C fan=47%%

I have it set to:
Core: 1200
Memory: 2200
Undervolting: 950
Powerstage: 2

I have played around with these settings but can't seem to get it to be higher on GPU0.

Anyone have an Idea or is this the best I am going to get?

Thanks.