Hello everyone I have been trying to get my first rig up for about a month now. After 2 other motherboards I landed on this one. I have been emailing Biostar for a couple of week and I have been getting responses in regards to getting more than 4 GPU's working. So I felt compelled to post their responses as it seems like they have put me on the path to getting 6 GPU’s working.

My System: MOBO: TB350-BTC, MEM: 8GB Corsair, CPU: AMD Ryzen 3 1200 (changed from AMD A12-9800e R7 APU), HDD: 1TB Western Digital (changed from Kingstun 120Gb SSD), GPU's: 6xSaphire RX470 4G (removed 1xRX480), OS: Windows 10 64bit, Video Driver: Radion 17.3 newest, BIOS: B35BG512.BSS

My symptoms: Currently the system will boot normal with 5 GPU's (in any order or PCI slot combination on the MOBO) but if I add the 6th GPU I get: -Blue screen after POST –And Blue screens “if” I get into the OS after windows tries to install driver.

Biostar’s Response: Mining mode set motherboard to work with multiple GPU and set video to output in UEFI mode, please make sure to install windows in UEFI mode as well.

Result:So I put BIOS into “Mining Mode = Enabled” and set “Video=UEFI mode” but now system boots directly to BIOS.
Also did some searching about installing windows in UEFI mode and it look like the HDD needs to be formatted in GPT (GUID Partition Table) partition in order to install windows in UEFI mode. Apparently you can get lucky if windows detects UEFI mode and it will work “First Try”.</p>

My Next Question to the form and Biostar:

What are the exact settings in the bios that need to be changed to put the BIOS UEFI mode?

Has anyone tried installing windows in UEFI mode and did that fix multi GUP problem?