Gigabyte Gaming 580 is running a steady 29-30mh/s, Aorus is absolutely no different, MSI Armor I bitched about before are actually the best cards at 30-31mh/s. Red Devil's arriving tomorrow.........and I'm out of boards.
So far the MSI X170a gaming m5 has been a clusterfuck bitch trying to get to run more than 4 cards, instead of 7. Still looking for a solution :\
I run this board with 9 cards without issue, and it was very easy to get running. I have helped a couple people with this board, and to the best of my knowledge, everyone has been able to get it to work with the following steps:
1. Use a Skylake processor. One person I know of started with a Kaby Lake processor, and he could not get the board to run more than 4 cards without switching to a Skylake.
2. Update the BIOS to the latest version.
3. Enable above 4g decoding
4. Leave all other settings alone, especially the settings concerning PCIe speed.
I've got some more risers arriving this evening. All my boards have Skylake i5's, 8gb of 2400 RAM. I set the 4G, other settings to Gen 2 and my one test board is running 4 cards. Two on the board and 2 using risers. Until I get more risers in, not much else I can do for now.