I got an Asus Prime X470 Pro / Ryzen 7 2700 with the latest 18.104.22.168B firmware. I tried passthrough with a Radeon 5700 and an Nvidia GTX970, with and withount vbios. Nothing works. I can't get them to work and it is definitely a problem with the Bios. Next thing i try is to downgrade the bios. What version did people have success ? Maybe i will try downgrading to the first which is on the Asus site.