I have this mobo running 8 cards.

It is true its a pain to setup and logic doesn't apply when configuring it to work with more than 7-8 cards.

What worked for me was using the blockchain drivers. Not the latest ones though. Or 17.11.4 AMD Drivers which will let you use MSI afterburner to change mem and core speed.

Also if you have connected 7-8-9 or 10 cards but it doesn't show some of them try changing the pciE slots. I plugged them in order from 1st to 8th skipping the main pciE.

Im about to connect 2 more cards at some point for a total of 10 but for now i can't tell which slots and in what order the mobo will detect. One thing sure is that you need to use DDU each time you change the drivers.

Also for me the latest version of drivers didn't work because although all cards where detected i COULDN'T use MSI afterburner to change clocks so i only got speeds up to 22-24 in claymores ETH miner.

I have read somewhere that you need a combination of cards for the mobo to run all 13 slots. Ie you need both AMD and Nvidia im not sure if it matters which you need more or if you need mining specific cards as well.

If anyone's got any questions or has any other info feel free to post. I ll keep this thread updated!