What are the specifications of the Plex Linux server

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Want to make a new server for high conductors quality 1080p with 4k PC Linux Ubuntu I want to know what are the specifications of the required device as server works with plex is it Linux or there is something better

My ubuntu 18.04 and 20.04 machines have run better than my win10 machines with plex. YMMV. They run leaner, lower resource usage.