In the first place you don’t need a computer to get excellent sound from digital. At least not the type of computer we’re talking about here a lot of things like phones and tablets , streamers are ’computers ’. True if you want to use room you’ll need a computer to run the OS but you don’t need dual 10 core hyperthreading Xeons for 40 threads and 48 gigs of ecc ram. I don’t really like roon so why would I need a computer? I use a NAS and rarely use that mostly I stream tidal. Digital has RF emission computers are about the worse for this so if you use one don’t stick in your audio rack. Vibration control has been taken to extremes but the OP is looking for a DAC and streamer no mention of a server how does the Extreme alleviate vibration in a DAC attached to it with a cable? I said the Extreme is probably a very good server one of best I imagine but it isn’t what the guy asked about. Lumin x1 is about $14K has a great dac ,dual mono design, femtoc clock, optical network to isolate digital noise, great user interface, streamer. Matrix Element X one of the best measuring dacs with top of the line ESS chips , xmos USB prossecor , linear power supply, isolation ldo, hook it to a good home network with a quality NAS and you’ll get excellent digital sound for $3K. It even has a micro sd card slot just put your music on those. These are not servers will not run roon core but at least they are a dac/streamer what the OP asked about.