Install and run Z-Image Turbo locally with ComfyUI workflow
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A comprehensive guide to downloading the necessary JSON workflows, updating ComfyUI, installing Z-Image models, and generating your first local image.
Resolution Limits
While the model can upscale, native generation quality begins to degrade above 2048x2048 resolution. Attempting 4K generation directly may push VRAM limits and reduce coherence.
Step Count Sweet Spot
Use 8 to 10 steps for the best balance. Lower steps (4-6) result in faster but softer/noisier images. Steps higher than 10 may improve sharpness slightly but can lead to over-sharpening artifacts.
CFG and Negative Prompts
Z-Image Turbo works best with a CFG of 1.0. At this specific value, the model effectively ignores negative prompts. If you need strict text adherence, increase CFG to 1.x or 2.0, but be aware this increases color saturation.
VRAM Requirements
The 11.4 GB model fits within 12 GB VRAM cards. It can run on lower VRAM specs (e.g., 8GB) by utilizing ComfyUI's automatic offloading features.
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