This is from Roon’s recommendations here.
https://kb.roonlabs.com/FAQ:_What_are_the_minimum_requirements%3F
And there is more discussion here.
https://community.roonlabs.com/t/suggested-hardware/90/20
However this is not the minimum just their recommendations you may be ok with something less but maybe not. A lot depends on your library size. Smaller libraries will likely be fine on something less, larger libraries will probably not be.