I'm new to home server shit so it's a bit of a shock that finding reliable reviews/benchmarks for anything not explicitly for gaming is such a hassle.

Anyway, I'm thinking of building an all-in-one server.
The two things I'm planning to use this server for and are relevant for this question are Machine Learning (my dad and I each have our own little projects) and Jellyfin.
I'm planning on throwing some kind of 3090 into this server for the former task, so one way or another this server is going to have that.
Before I had the idea of using this server for ML I figured I'd need to add the cheapest intel GPU I could get my hands on for efficient Jellyfin transcoding, since the 3900X I already have doesn't have an iGPU.

If I'm going to have a 3090 in my server there's no reason to add something like an Intel Arc Pro 40 in there as well, right? might as well have it handle the transcoding as well.
I know that the convention is that Intel are the absolute best for efficient transcoding but how much of a difference could it really make for like 2 or 3 concurrent streams? like 5-10 watts?