Lolliedieb,
would it be possible to add GCN1 support for Beam-III? I saw the kernel requires 3G memory which would be sufficient on Tahiti cards (7950, 7970, 7990, 280, 280X) but the algo seems not to be supported on this architecture. Beam-II seems to work and a 950/1500 clocked 7970 does 12sol/s. I can also mine Zhash at 24sol/s. I managed to setup the card on Ubuntu 20.04 using amdgpu drivers and the amdgpu-pro OpenCL runtime in headless mode which works despite AMD saying this card is no longer supported. It also works on Windows in the mentioned algorithms but I specifically tried on Linux due to the GPU memory usage.

Pastebin with outputs of benchmark runs for Beam-II, Beam-III and the clinfo output: https://pastebin.com/uSxN32RX