easiest is just to get a newer intel i3 with iGPU.
transcodes everything and is very fast at it as well with quicksync. and uses a low amount of power.
Thanks for the suggestion!
I will keep it in mind but it's not very practicable for me right now, unfortunately, as I'm not looking to replace my whole server setup, I was only looking for a possible upgrade path for the Jellyfin VM on my ESXi server via an empty pcie slot.