Tried it with an Intel Arc A380.
Worked like a charm the first time, GPU visible in VM, installed current drivers. No output on monitor plugged into the GPU, but no big issue.
After restarting the VM I got the famous error pci header type 127. A full reboot of the host machine solved it, but it comes again after every VM reboot.
I guess that's a byproduct of Unraid still not supporting Arc GPUs.
Also got a strange error one time, that it was unable to bind it to vfio, but I think that was because it simply didn't detect the card and tried to vfio some CPU stuff to the VM 😂
I'll let the card sit in the host, doesn't make performance worse, I think. And when the Beta branch for the Arc support finally comes, I will give it a try again.