How to Fix ComfyUI VRAM Shortage

What the error means

This error indicates a failure in the GPU allocator. The exact cause depends on the first failing operation and environment; do not treat later asynchronous errors as the root cause.

Common symptoms

• Workflow stops during model load or sampling

Likely explanation

• Combined checkpoint, VAE, ControlNet, and latent tensors exceed VRAM

Suggested diagnostic steps

• Capture the complete error and the first failing operation.
• Record framework, package, driver, GPU, and operating-system versions.
• Reproduce with the smallest workload and inspect memory and health output.

Step-by-step fixes

• Correct the first incompatible resource, version, or configuration identified by the checks.
• Restart from a clean process and rerun the minimal reproduction.
• Scale the workload down or choose compatible capacity before restoring concurrency.

Known workaround

• Reduce batch size, concurrency, or context while the root cause is being corrected.

Current resolution status

Tracked; resolution depends on environment and version.

Confirmed source issues

No individual issue has been approved as evidence yet. This candidate guide remains noindex.

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