DiskStation® DS423+

[TheDreadPirate]

Xeon CPUs are not magic. They use the same CPU cores that their desktop counterparts do. And that particular Xeon is a D-1527, which has 4 Broadwell cores, circa 2015. And it doesn't have an iGPU, not that a iGPU from that era would be that useful.

And that chassis would require you get a workstation/server class GPU due to the 1U form factor, which costs more.

Kandykarter's suggestion of an N100 mini PC would perform MUCH better for Jellyfin than that Xeon CPU. And then use a NAS as just a NAS.