Windows error 1455: paging-file exhaustion is not CUDA out of memory

Symptoms and scope

This Windows error concerns committed system memory. It should not be treated as VRAM exhaustion or proof that a safetensors file is corrupt merely because it appears during model loading.

Error fragments for search; IDs, values and filenames may vary:

The paging file is too small for this operation to complete
os error 1455

Source-supported context

Microsoft names 1455 ERROR_COMMITMENT_LIMIT; its page-file guide relates the commit limit to RAM plus page files. A separate Windows note describes allocation failures while an automatic page file grows, so system-managed sizing alone does not prove adequate headroom. ComfyUI issue #7069 records the error but no verified repair. Source 1 Source 2 Source 3 Source 4 ComfyUI startup options

Cases to distinguish

1. The page file is disabled, too small, short on disk space, or too slow to grow during an allocation burst.

2. Several memory-heavy processes bring committed memory close to the system limit.

3. Loading multiple models, or using an offload mode that keeps weights in CPU memory, can increase system-memory pressure; other offload modes may behave differently.

Diagnostic sequence

The sequence below is an editorial procedure based on the cited context, not a diagnosis already confirmed for your environment.

Step 1. Inspect the committed-memory figures in Task Manager and free space on the page-file disk.

Step 2. Save work, stop unnecessary generation instances and memory-heavy applications, then record the peak on the same small workflow.

Step 3. Compare peak committed memory with the commit limit, then inspect Windows virtual-memory settings and page-file disk space. System-managed sizing can still lag a rapid allocation; record the original configuration before any change and restart when Windows requests it.

Step 4. If headroom remains insufficient, reduce simultaneous models or workload size. Do not use cleanup scripts that indiscriminately remove system files or active outputs.

Completion check

Error 1455 disappears, committed memory retains headroom and the task progresses. A new CUDA OOM belongs to a separate GPU diagnostic branch.

Limitations and cautions

There is no single page-file size appropriate for every machine. Paging consumes disk and affects performance; it is not equivalent to adding physical RAM or VRAM.

Original sources

• Windows page file introduction — checked 2026-09-25.
• Windows error code 1455 — checked 2026-09-25.
• Windows slow page-file growth — checked 2026-09-25.
• ComfyUI issue #7069 (individual report) — checked 2026-09-25; report opened 2025-03-04.
• ComfyUI v0.37.0 startup options — checked 2026-09-25.

Sources and English wording rechecked 2026-09-25. No Windows configuration change, memory benchmark, GPU run or repair guarantee is supplied.

Related troubleshooting and guides

• CUDA out of memory: separate model loading, sampling and VAE decoding
• No space left on device: check caches, temporary files and output volumes