This workflow is a very simple and lightweight ComfyUI setup with just 4 nodes, allowing you to upscale your previously generated images (at low resolutions) using models like RealESRGAN or any other upscale model of your choice.

The goal of this workflow is to support systems with low VRAM, low RAM, CPU‑based setups, or even AMD GPUs, so they can upscale previously generated images without running into errors.

I personally use this because if I keep all the settings in a single workflow, I run into memory shortage errors. So I wanted to share my solution for upscaling with anyone else who encounters similar issues. For personal use—such as setting a monitor background—the results should be more than satisfactory.