When will my Mac mini be obsolete for Roon?

[Bill_Janssen (Wigwam wool socks now on asymmetrical isolation feet!)]

Mac Mini 4,1 SPDIF output (Ubuntu 16.04)

I’m running Roon Server on a 2010 Mac Mini (which is running Ubuntu 16.04). Seems to be working fine, so I’ve gotten ambitious. I’d like to use the digital optical out of the Mac Mini to run sound to my Onkyo TX-8050. I’ve been unsuccessful in the past doing so – audio configuration defeated me – but perhaps Roon knows things I don’t? Anyone else done this? I see an output in the “Devices connected directly to Core” group, which is an “HDA NVidia CS2406 digital”. Is that the SPDIF output? …

So, what do you see in your “Devices connected directly to Core” group?