This is a ‘Coffee Lake’ generation cpu, so Quic Sync support should be really good. With enabled hardware transcoding support, you should be good for at least 6 concurrent transcoded streams.
However, subtitles may put a fly in the ointment.
Do you or your sharees rely on subtitles? Depending of the used type of Plex clients, and the type of the subtitles themselves, the subtitles need to be burned in to the video picture. Which is not supported by a hardware unit in the cpu and can only be done by one cpu core at once (‘single-threaded’).
You’ll have better performance and a higher chance of not requiring ‘burning in’, if you use text-based subtitles (SRT) instead of those ripped from DVD/Bluray (which are image-based, VOBSUB/PGS).
Side remark: in the interest of keeping the server stable, get yourself a big cpu cooler (those which are usually used the overclockers - but don’t O’C your plex server’s cpu!). It reduces the noise level and is able to keep the server cool even in the summer.
I almost forgot. Whatever cooler you choose, make sure it will fit your motherboard AND computer case.
The cooler’s dimensions and socket compatibility should be posted on the manufacturer’s web site.
I have no hard evidence to back it, but the server edition ‘feels’ smoother. My guess would be it can be easily configured to not run all the desktop-related services, like the godawful app store and its hideously slow auto-update of the installed apps.