The B580 is not supported by Unraid. I bought one thinking this but found out that it is not supported. I had an A310 working perfectly and just wanted more encoding speed. Good news though... I didn't give up. I have AV1 encoding working in Tdarr on Unraid as well as Jellyfin transcoding using the B580. Can't get Plex to actually use the B580 even though it is visible to Plex. Happy to help anyone get it working. I had to install Thor's Kernel and put a good few days of reading errors and figuring shit out. I also have a few AV1 Flows for Tdarr that are pretty awesome, that I've hand built, just for the B580. Happy to share my experience and any logs. You will need to run Thor's Kernel and the other intel driver.