I seem to understand that AMD hardware transcoding is not supported yet.
I’m building a NAS / streamer server and I would take in consideration this SBC, for the power consumption and the great benchmark:
Note: Our hardware-transcoding system has technical support for many dedicated AMD graphics cards, but we haven’t done official, full testing on those. Support for AMD GPUs is provided “as is” and your mileage may vary. It is recommended that you use Intel Quick Sync Video or a dedicated NVIDIA GPU.
Beyond that, maybe you can find some positive references for that particular model / GPU using the forum search.
Edit: apologies… I noticed too late this is actually about Linux