Radeon rx 580 for Blender 2.81 or newer?

[chalybeum (Markus Mayer)]

For NVIDIA I got you covered here:

Phoronix benchmarked a wide range of NVIDIA GPUs

Everyone interested in investing in a new NVIDIA GPU should have a look here: https://www.phoronix.com/scan.php?page=article&item=blender-281-optix&num=1 They tested pretty much everything that is out there.

I have no link for AMD at hand right now.