ComfyUI-INT4-Fast

By viralvfxView on GitHub →

This node speeds up Flux-based models in ComfyUI by using INT4 (W4A4) quantization on RTX 30 and 40 series cards, delivering faster inference and lower VRAM usage.

How much VRAM does ComfyUI-INT4-Fast require?

Direct Answer: The ComfyUI node ComfyUI-INT4-Fast requires a minimum base VRAM of 12288MB and is optimized for GPUs with at least 24GB of VRAM. Low VRAM mode is not supported for this node.

Extreme (>8GB)
Base VRAM:
12288MB (12.0GB)
Recommended GPU:
24GB+ VRAM
Low VRAM Mode:
✗ Not supported
Estimation Confidence:
HIGH

Interactive VRAM Compatibility Estimator

Estimated Total VRAM: 3.00 GBTarget: 8 GB
✅ Comfortable Fit

Your GPU has plenty of headroom. You can run this node safely with your active configurations!

Deploy on High-Performance GPUs

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🚀 Deploy on Vast.ai

Deploy on Cloud GPUs

Need more VRAM to run ComfyUI with this node? Rent low-cost, high-performance cloud GPUs on RunPod instantly.

🚀 Deploy on RunPod

Compatible Foundations

This node is verified to support or optimize workflows for the following foundation model families:

⚡ FLUX.1

Related Custom Nodes

The following custom nodes run in the same PyTorch / CUDA environment and share similar categories or workflows:

Bobs_LoRA_Loader
by bobsblazed12.0GB VRAM
ComfyUI Flux2 Untwisting RoPE
by xmarre12.0GB VRAM
ComfyUI-Chroma-RoPE
by clybius12.0GB VRAM
ComfyUI-Cloud-APIs
by BetaDoggo12.0GB VRAM
ComfyUI-FLUX-BFL-API
by gelasdev12.0GB VRAM

Frequently Asked Questions

How much VRAM does ComfyUI-INT4-Fast require?

ComfyUI-INT4-Fast requires a minimum of 12288MB (12.0GB) of VRAM for base operation. For optimal performance, a GPU with at least 24GB of VRAM is recommended. Low VRAM mode is not supported for this node.

Can I run ComfyUI-INT4-Fast on an RTX 3060, RTX 4070, or RTX 4090?

❌ RTX 3060 (12GB): Insufficient VRAM (needs 12.0GB minimum). ❌ RTX 4070 (12GB): Insufficient VRAM (needs 12.0GB minimum). ⚠️ RTX 4070 Ti (16GB): Can run, but may experience performance issues or require low VRAM mode. ✅ RTX 4090 (24GB): Yes, fully compatible with 9.6GB headroom

How do I install ComfyUI-INT4-Fast in ComfyUI?

To install ComfyUI-INT4-Fast: (1) Navigate to your ComfyUI/custom_nodes directory, (2) Clone the repository: git clone https://github.com/viralvfx/ComfyUI-INT4-Fast, (3) Install dependencies: pip install -r requirements.txt (if present), (4) Restart ComfyUI. Alternatively, use ComfyUI Manager for one-click installation.