All the heavy lifting in Roon is done by the core and the end result is then sent to your Roon Bridge (which is for all intents and purposes idling) for passing through to your DAC. A RPi running DietPi, an Odroid C1+ or C2, a Cubox etc. all work fine as Roon Bridge hosts and I seriously doubt spending more money on a device that claims to do a better job is going to make any tangible improvement in what you hear. Start with a Pi, load DietPi and see how it works for you.
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