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How to Run FLUX 3 Klein in ComfyUI on 8 GB VRAM (The Upsampler Alone Is 9.8 GB)

Black Forest Labs says FLUX 3 Image Klein runs locally in ComfyUI on an 8 GB card like the RTX 3070. That's true for the transformer. The prompt upsampler the model card calls "required" is a 9.8 GB file on its own, so the full int8 stack you download is 20.8 GB of weights for an 8 GB GPU. You can…

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  1. 2026-11-08 22:50 · DEV Community — Machine Learning
    How to Run FLUX 3 Klein in ComfyUI on 8 GB VRAM (The Upsampler Alone Is 9.8 GB)

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