I have this board. I use to run two AMD cards on it with no issues with Windows or Linux. Then when I got two more cards, the board would not even POST. I figured it was a power issue. So I got a bigger power supply. The problem persisted. Then I started running through the forums, BIOS,... everything! I finally decided to run the board with one 4 GB stick of RAM. Viola! the board booted up with no problems. I tried it again with both slots (8 GB) of RAM. Again, it would not boot. It runs fine with Linux, but obviously Windows 10 Pro wants more RAM and has issues trying to mine all of my cards on 4 GB.

I have not found any solution for this issue. I set everything up exactly how Biostar said to. But the board refuses to boot with both RAM slots and over 3 GPUs.

Biostar has not put out any new BIOS updates for awhile now. 

MB: Biostar TB350-BTC
CPU: Ryzen 3 2200g
RAM: Crucial Ballistix 8 GB (2 x 4GB) 3200 (*only one stick of 4 GB.)
Storage: Kingston 120 GB SSD
PSU: EVGA 1600 watt
OS: Ethos Distro (Linux)