ComfyUI error: OOM on very large images

ComfyUI retries with smaller tiles; else downscale input first.

ESRGAN model upscaling

Upscale images with an ESRGAN-family upscale model.

Estimated VRAM

~0.07 GB — ⚠️ ESTIMATE (unverified real-world usage). Estimate, not a measured figure: weight-size floor = RealESRGAN_x4plus.pth (0.07 GB, sizes verified on Hugging Face/GitHub); memory scales mostly with image size. Activations add more; ComfyUI offloading can reduce it. Source, checked 2026-10-13.

Models required

RealESRGAN_x4plus.pth — 0.067 GB ✅ verified 2026-10-13 (listing) → models/upscale_models

Tested GPUs

No verified test reports yet.

Nodes

UpscaleModelLoader ImageUpscaleWithModel LoadImage SaveImage

Common errors & fixes

OOM on very large images: ComfyUI retries with smaller tiles; else downscale input first. ⚠️ unverified: Fix is general guidance; not confirmed against the cited source.

Low-VRAM tips

⚠️ General guidance, not individually verified.

Fits nearly any GPU

Source & credit

Workflow by comfyanonymous (ComfyUI_examples). Get it from the original: https://comfyanonymous.github.io/ComfyUI_examples/upscale_models/. License: RealESRGAN: BSD-3-Clause.