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AUTOMATIC1111 / Stable Diffusion CUDA error

AUTOMATIC1111 webui, PyTorch, CUDA

CUDA out of memory or 'Torch not compiled with CUDA' at startup.

What it means (root cause)

GPU memory exhausted by model + precision, or a PyTorch/CUDA toolkit mismatch.

The symptom developers actually see: CUDA out of memory or 'Torch not compiled with CUDA' at startup.

How to avoid it: Match torch CUDA build to driver; reserve VRAM headroom for the OS.

Step-by-step fix

Concrete, ordered steps from the dataset. Apply them in order; each line is a verified action, not generic advice.

  1. 1Launch with --medvram or --lowvram to cap memory use.
  2. 2Confirm torch.cuda.is_available() in the same Python env used by the webui.
  3. 3Reinstall a PyTorch build matching your CUDA driver version.

Where this error appears

Languages, frameworks, and runtimes where this error is observed (from the 2026 DevFixPro error dataset, retrieved 2026-08-29):

AUTOMATIC1111 webuiPyTorchCUDA

AUTOMATIC1111 webui on Windows/Linux with an NVIDIA GPU. The CUDA toolkit version must match the PyTorch wheel you installed.

How to prevent it & common questions

Practical prevention plus the questions developers ask most about this error.

What does "AUTOMATIC1111 / Stable Diffusion CUDA error" mean?

GPU memory exhausted by model + precision, or a PyTorch/CUDA toolkit mismatch.

Which environments are affected by AUTOMATIC1111 / Stable Diffusion CUDA error?

AUTOMATIC1111 webui, PyTorch, CUDA

How do I fix AUTOMATIC1111 / Stable Diffusion CUDA error?

Launch with --medvram or --lowvram to cap memory use. Confirm torch.cuda.is_available() in the same Python env used by the webui. Reinstall a PyTorch build matching your CUDA driver version.

How do I prevent AUTOMATIC1111 / Stable Diffusion CUDA error?

Match torch CUDA build to driver; reserve VRAM headroom for the OS.

Related DevFixPro tools

Real, browser-only utilities on DevFixPro that help while you work through this issue. These are navigation aids, not a substitute for the fix above.

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YAML / INI Config Linter

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● Data updated 2026-08-29

Sources & attribution

  • Error records aggregated from Google Search Console query gaps (2026-05-21~2026-08-18) for devfixpro.com, plus official framework docs (MDN, Node.js docs, Python docs, Go.dev, Rust book, Oracle Java docs, Docker docs, npm docs). Source dataset retrieved 2026-08-29. License: CC BY 4.0 — attribute DevFixPro (devfixpro.com).
  • Official reference: https://github.com/AUTOMATIC1111/automatic1111-webui/wiki
  • All cause, environment, fix and prevention text on this page is taken verbatim from the DevFixPro 2026 error dataset. DevFixPro does not invent root causes or fixes.
How this AUTOMATIC1111 / Stable Diffusion CUDA error page is built

Each error page is generated from a single record in the DevFixPro 2026 error dataset. The meaning, root cause, environments, fix steps, prevention, and official references are copied verbatim from that dataset and its official-doc sources; related-error links are computed from the error's category and explicit peer list. No root cause or fix is invented. The retrieval date for this dataset is 2026-08-29.

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