Running Minimax H3 locally on 12GB VRAM: 5s low-res clips take 10 minutes, anything bigger takes hours
burnswhenireddit · reddit · 2026-08-25
A ComfyUI user reports hitting walls running Minimax H3 locally on a 4070 Super (12GB VRAM, 64GB RAM): 3–5 second low-resolution clips take 10 minutes, but respectable resolutions or clips beyond 5 seconds blow up to many hours (usually aborted). The portable ComfyUI install has blocked them from ever getting Triton or Sage Attention working despite many tutorials, limiting workflow options. A turbo LoRA helps somewhat but not enough to justify higher resolutions. They're asking for workflows suited to this hardware.
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