Hi folks, I have an Asus Prime X299-A II with a 44-lane CPU, a Radeon Pro WX 3200 4GB (host GPU), and a Radeon R7 370 4GB (guest GPU).
Initially, I had the guest GPU in top slot. When I eventually connected a dummy plug to the guest GPU, I lost POST/UEFI video output on the host GPU. I figured the host GPU had to go in the top slot, so I rearranged my expansion cards and… same issue. It seems as though the monitor connected to the host GPU is always ignored if there’s a monitor connected to the guest GPU.
There’s no clear “Primary GPU” option in the UEFI. I’ve played around with a number of options including Above 4G Decoding, Resizable BAR, ACS Support, etc. without any progress. I’m hoping someone here can point me in the right direction.
Thank you in advance!
Mike