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license: other
license_name: minimax-h3-community-license
license_link: https://huggingface.co/MiniMaxAI/MiniMax-H3/blob/main/LICENSE
base_model: MiniMaxAI/MiniMax-H3
tags:
- minimax-h3
- ref2va
- video-generation
- comfyui
- fp8
- float8-e4m3fn
---
# MiniMax H3 Ref2VA FP8 E4M3FN for ComfyUI
Unofficial mixed-precision FP8 conversion of the MiniMax H3 Ref2VA diffusion model for ComfyUI.
## Files
- `minimax_h3_ref2va_fp8_e4m3fn.safetensors`
- Size: 33,236,581,696 bytes (30.954 GiB)
- SHA-256: `EE41F81E1347B415000F5818712E5AACD3C841851AF56F66FC907F2CCBA43151`
## Conversion
The source BF16 checkpoint was converted tensor-by-tensor to avoid loading the full model into RAM or VRAM. Multi-dimensional weight tensors were converted to FP8 E4M3FN, while normalization, bias, conditioning, final-layer, and time-embedding tensors retained BF16 or FP32 precision.
- FP8 E4M3FN tensors: 258
- BF16 tensors: 264
- FP32 tensors: 13
- Source SHA-256: `E32C54C1A7B4F5F397F195CEA267CCB18806303BB665678C4BEE60953BDF3026`
This is a modified derivative and is not an official MiniMax release.
## ComfyUI
Place the checkpoint in `ComfyUI/models/diffusion_models/` and load it with the standard `UNETLoader` using `weight_dtype: default`.
Verified locally with ComfyUI 0.29.0 and an NVIDIA RTX 5090 using:
- Ref2VA
- 768 x 1344
- 124 frames at 24 fps
- 20 steps
- `res_multistep` sampler
- `beta` scheduler
ComfyUI reported the checkpoint weight dtype as `torch.float8_e4m3fn` with BF16 manual casting during inference.
## License and source
Base model: [MiniMaxAI/MiniMax-H3](https://huggingface.co/MiniMaxAI/MiniMax-H3)
This repository includes the upstream MiniMax H3 Community License Agreement and required `NOTICE`. The upstream license contains territorial restrictions and excludes the European Union, United Kingdom, Republic of Korea, and United States from the applicable territory unless separately authorized by MiniMax. Review the full `LICENSE` before downloading, using, or redistributing this checkpoint.
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