1st Jellyfin Server

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Either of the latter two have the same iGPU which will support QuickSync. The first option is old enough that you won't get a ton of benefit from hardware acceleration, but should still be able to use VA-API. The latter two options are likely a toss-up if this is a dedicated machine for Jellyfin. For extra storage, you'd be looking at adding (likely) 2.5" drives if there are open/convertible bays or using external drives or drive bays.