@devinplombier I actually have a PC from a company called SilentPC. I have a liquid cooled fanless PC that I use in my office. I cost about $6k but my client bought it for me. That machine is very solid with 6 monitors running off it. It also only supports RJ45 network connections.
I ran my ROON Core off this silent machine and compared it to my cheap $500 Dell that is under my guest bed. Both sounded the same using my Sonore OpticalRendu as the fibre moat before the USB connection to the DAC. I expected them to sound the same.
The idea of using SFP in the PC is interesting. I am not sure if it would make a difference in my situation. However, once my $500 Dell machine dies, I will look into getting another PC but this time with an SFP network connection.