Nvidia GTX960 vs AMD RX580 for transcoding?

[bughidudolo]

Hello everyone

I am building a new TrueNas Scale NAS with an old PC and I want to include a graphics card to do transcoding

I have a GTX 960 and a RX580 lying around, which one would be better?

The rest of the system has
- Ryzen 7 2700x
- 16Gb ddr4 Ram
- 128gb SSD for OS + 10TB for the NAS

I also know that I might be able to just do transcoding on the CPU, but I don't know how well it would work for large 4k bluerays with DB and DA

Thanks in advance for your help