Go to roon and look up rock or just Google roon rock it runs on specific NUC’s. They give a list I got a fanless i5 with 8gigs of ram and a 250 G M.2 SSD cost around $600. Roon ROCK is a free download from roon it’s their OS optimized to run roon core server. Edit: This is easier,
https://kb.roonlabs.com/Roon_Optimized_Core_Kit
https://kb.roonlabs.com/Roon_Optimized_Core_Kit