Running MiniMax H3 video gen on 4GB VRAM: blurry hands at 512p or 6+ hours per clip at native res
unbenannt1 · reddit · 2026-09-08
A Reddit user documented days of experiments running MiniMax H3 Reference-to-Video locally on an RTX 3050 Laptop (4GB VRAM, WSL2, ComfyUI) to fix blurry hand rendering:
- Loading FL2V weights (minimaxh3fl2vaprunedint8) into the multi-reference node instead of the native Ref2V node fixed an earlier "ghost fingers" defect.
- At 512x288, hands still render as blurry blobs during gestures. Turbo distilled 4/8 steps unusable; off-label 10 steps made it worse; cfg=5.0 caused severe embossed cross-hatch artifacts; cfg=2.0 inconsistent; 30 steps no real gain.
- What works: 768x448 (H3's native short edge), no distillation, no CFG, native 20 steps — but 6h22m for one 15-second, 362-frame clip.
- Draft-then-upscale routes (pixel-space RealESRGAN, community latent 2x upscaler, tiled diffusion refine) each hit dealbreakers, including a ComfyUI core bug the author root-caused and patched locally.
Open questions: whether mid resolutions (608x352/640x384) capture most of the quality gain, whether turbo LoRAs are fundamentally tied to their distillation resolution, and whether any attention backend or quantization tricks make H3 realistic under 8GB VRAM.
Related event: Running MiniMax H3 Locally: Artifacts and Heavy Render Times Plague Users(2 posts)→
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