I have only a PCIe 2.0 x4 and a PCIe 3.0 x16 free and I need to install a 10Gbps SFP+ card and a graphic card for transcoding with Jellyfin (the CPU is an old E5-2620 v2). Since I can’t find any SFP+ card that is x4, do you know a graphic card with decent transcoding capabilities (I’d day 2 4K simultaneously) that is only PCIe 2.0 x4?
Edit: the x4 slot is full length.
Resizable BAR was previously cited as a requirement for Intel ARC cards, but I think the drivers today can do without. Sounds like your system might be too old to have that. Might be a soft requirement, as in you’ll see a performance drop if you don’t have it.