To get my NVidia GT710 to passthrough to a Windows VM in UNRAID I had to tweak my boot options. I needed to add “video=efifb:off” to the UNRAID OS boot config. Now the GPU passes through no problems.
I have more or less stopped fiddling with my UNRAID system. Upgraded to 128GB of RAM and another nvme m.2 drive in the cache. I need the GPU and then loads of the HDDs and I will have a great UNRAID system for my needs.