Where to check for supported radeon hardware

[Sam Varshavchik]

I am trying to vet some hardware to buy, and make sure that, well, the
video card will work.

I see many builders offer radeon video cards with model names like rx
550, rx 570, and rx 590.

I can't find any mention of these models on
https://www.x.org/wiki/RadeonFeature/#decoderringforengineeringvsmarketingnames
or anywhere else I poked. Yet, I can find some bug reports, like
https://bugs.freedesktop.org/show_bug.cgi?id=106327 that reference it
as supported hardware.

So, what's the story on Radeon in 2020/2021?