Regarding Jellyfin, if the PC you got has an Intel CPU then using Intel QuickSync would actually easily outperform the NVIDIA card for transcoding.
Up until very recently I was using a cheap i3 to power my Jellyfin instance that often has 5+ streams going at a time. (The only reason I upgraded was that I had a friend getting rid of an i7 from the same gen lol)
Regarding Jellyfin, if the PC you got has an Intel CPU then using Intel QuickSync would actually easily outperform the NVIDIA card for transcoding.
Up until very recently I was using a cheap i3 to power my Jellyfin instance that often has 5+ streams going at a time. (The only reason I upgraded was that I had a friend getting rid of an i7 from the same gen lol)