In a very cluttered neighborhood and I get about 300Mbps up and down on 6E 5GHz. My fibre connection allows 1Gb. I only reach those speeds wired.

Read up on Intel QSV. You essentially only need a recent cpu. i3 would do.

I hear good things about the Intel Arc A380. You basically only need it to convert video and the Intel is not too bad at that for not too steep a price

Love plexamp, hate the way plex forces album-centric metadata.