If you have an old desktop to repurpose, jellyfin is best ran on one of those with an Intel a380 gpu as long as the motherboard supports resizable bar. Cpu-wise jellyfin doesn’t really do anything intensive, and intel’s gpus all come with the same 2x video pipelines so upgrading to a 770 wouldn’t add any performance. If you’re buying new, my recommendation would be to get one of those intel white label laptops xpg made for a while. They can be had around $300-500 and come with a intel arc gpu you can use for encoding, resizable bar, decent ram, and a decent cpu. Great little jellyfin boxes.
And a pickup of gains from sending just the delta of changed data for one of their passive update beacons.