I am just one lowly engineer, but I do what I can.
The other 5000 and 6000 series cards work to varying degrees. Unfortunately, since AMD doesn't officially support them, I can't easily get hardware to test them myself.
My understanding is that the RX 6700 XT (gfx1031) mostly works, with some caveats. Gentoo did some performance tuning for the BLAS libraries with that GPU. The AMD GPU libraries aren't built for that architecture by default, but I'd be happy to help anyone compile them from source. There's an extensive open source test suite that can be used to validate GPU functionality outside of the official hardware support list.
Don't get me wrong, your efforts are definitely appreciated. It would just be nice if AMD officially put more of a priority on consumer Linux users. That's the reason I push back on the assertion that AMD Linux GPU (compute) support is there: it really isn't as what we've got are retrofitted enterprise drivers that, if you can get them to install, may or may not work for a given GPU and have some caveats if they do work. And if they don't work, well tough luck as they aren't officially supported anyways. Short of official support happening, it would be nice to see at least some skunkworks project(s) to get open source compute drivers going as the open source graphics drivers work quite well.[1]
I've gotten both the 6700 XT and 6600 to work (that's how I discovered the PCIe atomics issue: trying to run both cards at the same time with OpenCL) which is why I initially said 'can be made to work'. It took quite a bit of fiddling and I'm sure having the drivers packaged in the Debian repos will be better still as I don't know what I don't know and knowledge on the ground re: AMD compute drivers still appears a bit thin.
[1] The part of this story I find so depressing is that AMD should be eating nVidia's lunch re: Linux support. But since at a management level AMD doesn't seem to care about consumer Linux they actually manage to make nVidia's drivers look good in comparison. It would be nice if they would take a page out of Intel's playbook and give engineers like yourself their support to actually do consumer (open source) Linux support work as your day job. I can dream...
I agree with a lot of what you're saying. Thanks for the support, and for the information about compatibility. That sort of info is not always easy to discover (let alone contextualize), so I definitely appreciate the feedback.
The other 5000 and 6000 series cards work to varying degrees. Unfortunately, since AMD doesn't officially support them, I can't easily get hardware to test them myself.
My understanding is that the RX 6700 XT (gfx1031) mostly works, with some caveats. Gentoo did some performance tuning for the BLAS libraries with that GPU. The AMD GPU libraries aren't built for that architecture by default, but I'd be happy to help anyone compile them from source. There's an extensive open source test suite that can be used to validate GPU functionality outside of the official hardware support list.