More info is posted on AMD's community site[1] which dates itself "Thursday", but google which search dates "22 hours ago" which would be Sunday.
They say:
> Which AMD GPUs does the HIP SDK support?
> Everything from high-end workstation and gaming GPUs to laptop cards and even APUs. Below, you can see a list of the GPUs that AMD tests for use with the HIP SDK, but you may be able to support other cards in your own software: for example, Blender's HIP rendering backend supports AMD GPUs going back to the Vega generation.
Helpfully, the article then links to "GPU and OS support"[2] which at the present time redirects to a login-required page at readthedocs.com. Sigh.
1: https://community.amd.com/t5/rocm/available-now-new-hip-sdk-...
2: https://rocm.amd.com/en/update-windows-install-guide-improve...