Can’t answer your question but I got a refurb corporate m715 for 60 bucks, I haven’t bothered upgrading the 8Gb ram^* and it runs a full dockerized arr stack, vpn and jellyfin without any issue. I don’t reencode and I don’t use 4k media, so I can’t talk about that either.

But if you’re looking for cheap that works, it’s not a bad little machine.

^* The system actually run on 6Gb since 2 are reserved for video and by the time I realized that everything has been up and running fine for a while, so I didn’t even bother rebooting in the bios to change it, I just added a bigger swap 🙄