Hi Thank you for your post. I had G550 Pcie x1 also but having issue with gpu passthrough. Although I'm on proxmox but I believe the procedure will be very similar. I had it detected in my vm (windows 98, windows xp...), I was able to install driver using manual driver update however upon boot up i got all black screen. Just couple of questions. Are you using seabios or ovmf , you mention windows 11, perhaps you used ovfm? Is it possible you can share your g550 bios rom file? Thank you. This is the model I have: