web browser are terrible media players.
the plex web client can’t direct play that content (hevc), so it gets transcoded to something the web player can play (h264).
your server appears to be able to NOT be able to hardware DECODE the hevc, but does appear to hardware ENCODE the 264.
decoding HEVC is the hard part.
also, audio is always cpu decoded so that is another additional load.
this may or may not be of help @ [INFO] Plex, 4k, transcoding, and you - aka the rules of 4k
