R9700 llama.cpp RADV: Qwen3.5-27B decode at 2.9K prompt (u/neuromacmd, commit 48cda24)

r/LocalLLaMA post 1s4bggo, EDIT 5. llama.cpp rebuilt at commit 48cda24 (2026-03-27) with the Vulkan backend, run on RADV (Mesa 25.3.6). Same unsloth GGUF, one request, batch size 1, prompt processing at the post's 2.9K prompt length, generation is single-request decode. NOT aggregate. These numbers supersede the AMDVLK numbers from the same post for the supported driver; both are kept because the post publishes both.

EDIT 5 RADV retest at llama.cpp commit 48cda24, Mesa 25.3.6. Single GPU. The AMDVLK generation number from the same post is filed separately and is higher on the MoE model; the post says AMDVLK still wins generation on RDNA3/4 but is discontinued.