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.
ensure Max TOLUD is set to 3.5 GB in the bios.
NOTE: you must first only connect 6x GPUs, boot, make Bios changes, save and reboot, shutdown, add the other 6x GPUs, 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.
It's good to see somebody got this board to work. I have problems with this board. I have a tons of PCIe bus errors. Are you sure you haven't changed anything in the bios? PCIe bus speeds auto or gen2, or above 4G MMIO? Also do you use the IGFX or one of the mining card?
Could you share your settings?
The settings are in the quote you posted; also on the OP:
ensure Mining Mode is enabled in the bios. LINK to PICTURE
ensure Max TOLUD is set to 3.5 GB in the bios. LINK to PICTURE
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
Connect a monitor to the GPU connected to the 16x slot; nvOC and rxOC do not currently support integrated graphics.