They don't support it, but it works if you set an environment variable.

https://github.com/ollama/ollama/issues/2870#issuecomment-19...

Those are Navi 22/23/24 GPUs while the RX 6800+ GPUs are Navi 21. They have different ISAs... however, the ISAs are identical in all but name.

LLVM has recently introduced a unified ISA for all RDNA 2 GPUs (gfx10.3-generic), so the need for the environment variable workaround mentioned in the other comment should eventually disappear.