I got a BIOSTAR TB250-BTC PRO (12x gpu) today Link

I made a 12x 1060 rig with it.

ensure Mining Mode is enabled in the bios LINK  

ensure Max TOLUD is set to 3.5 GB in the bios LINK

NOTE: you must first only connect 6x GPUs, boot, make Bios changes, save and reboot, shutdown, add the other 6x GPUs, attach the USB or SSD and boot





I like the 13x out the box + m2 ssd ready ASRock more; but this is also a good mobo.  

Biostar sadly still can't handle; making mining settings the default.