Hi All,
New info for thouse who installed 6-7 cards but see only 5 in Win10 and you already installed AMD driver. After all thing according to first page done, you need to do the following:
0) Go to BIOS, then to "Board Explorer" and check that all your cards are visible there. Reboot to Windows.
1) Install Intel Chipset Driver, download from MSI support site. Reboot.
2) Install Intel Management Engine Driver, download from MSI support site. Reboot.
3) Go to Device Manager, remove all RX cards. After some time (several minutes) they are starting to come back. Wait until you see all of them (we have 6). Reboot.
Enjoy.
i'm not quite sure that item 2 is required, but with the above we have 6 cards visible in the system.