Nvidia Quadro P400 not working on Ubuntu server via GPU/PCIe passthrough
@TheFrisianClause I ended up selling my P400 and buying a P2000 which worked straight away. It's possible the P400 may work in future but I didn't want to wait until then.
Unfortunate waste of money, but I'm pretty happy with the setup now running 2 XCP-NG hosts now with Plex with the P2000 doing transcoding, game servers and other utilities.
@Pyroteq Currently I am running my plex server via TrueNAS scale with HW transcoding. So I don't need it with XCP-NG anymore... But for the people who do need it, this can be useful to them.