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reference Why Lemonade Server can do image generation on Strix Halo when ComfyUI cannot.
research
2026-08-28

Lemonade and sd.cpp

Why Lemonade Server can do image generation on Strix Halo when ComfyUI cannot. Research from the Lemonade source repo (lemonade-sdk/lemonade, cloned 2026-08-14) and live verification.

The short answer

Lemonade does not run ComfyUI. Its image-generation backend is a wrapped stable-diffusion.cpp (leejet/stable-diffusion.cpp) subprocess. sd.cpp is a ggml-family native C++ runtime that ships its own HIP kernels — and those kernels include gfx1151. ComfyUI runs on PyTorch, whose standard wheels omit gfx1151. Same hardware, different runtime, different result.

From the Lemonade source

src/cpp/server/backends/sdcpp/sdcpp_server.cpp:

  • Image gen is SDServer, a WrappedServer around a prebuilt sd.cpp binary.
  • Downloads sd-<version>-bin-Linux-Ubuntu-24.04-x86_64-<backend>.zip from leejet/stable-diffusion.cpp releases.
  • Backends: cpu, cuda, metal, rocm, vulkan.
  • ROCm asset is ...-rocm-<version>.zip; Vulkan is ...-vulkan.zip.

Backend support matrix (serverAppConfigs-docs/dev/backends-reference.md):

Recipe Backend Device families
sd-cpp rocm amd_gpu (gfx103X, gfx110X, gfx1150, gfx1151, gfx1152, gfx120X)
sd-cpp vulkan amd_gpu; cpu; nvidia_gpu
thenoise rocm amd_gpu (gfx1150, gfx1151, gfx1152) — experimental

gfx1151 is explicitly supported by sd.cpp's ROCm build. There is also a dedicated experimental thenoise ROCm backend targeting exactly the Strix Halo archs.

Engine comparison

ComfyUI Lemonade (sd.cpp)
Runtime PyTorch native C++ (ggml family)
AMD path needs PyTorch ROCm wheel with gfx1151 kernels — not in standard wheels ships own HIP kernels, gfx1151 included
On Strix Halo CPU only (today) ROCm GPU, or Vulkan fallback
Interface node graph web UI server, OpenAI-style API, GUI/CLI

This mirrors llama.cpp on the same box: ggml-family runtimes ship their own gfx1151 HIP kernels and run on ROCm; PyTorch does not.

Relevance

  • If GPU image generation on Dankclaw matters, Lemonade (or bare sd.cpp) is the working path today.
  • ComfyUI's node graph is the cost of switching: Lemonade is not ComfyUI.
  • See ComfyUI ROCm and Vulkan for the PyTorch-side analysis showing a gfx1151-enabled torch would also make ComfyUI work.

See Also