This Requires a lot of VRAM and the download of "https://huggingface.co/stabilityai/stable-diffusion-x4-upscaler/blob/main/x4-upscaler-ema.safetensors" - put it into the normal CKPT folder and Input it into the second CKPT Loader

i decided to remove the grouped nodes as these aren't correctly shown in the preview currently