Here are sizing suggestions.
TL;DR, if you have less than let’s say 700’000 or 800’000 tracks in your library, it’s probably better to stick to supported NUCs if possible. Above that, well…
With Roon in general, low idle consumption > high horsepower. This isn’t Red Dead Redemption, and outside of rather specific cases, awesomeness doesn’t scale. That’s why moar powaaa (so more heat, more noise both electrical and physical, more electricity draw) is detrimental. If yours is not an edge case, you might as well leave good enough alone, so please let people know what your use case is, i.e, how many simultaneous streams you intend to need, how many tracks are in your library, whether you want to upsample things, etc.