AMD RDNA3 guide: running MiniMax H3 video gen in ComfyUI at ~4 min per 5s clip
Big_Extension_9987 · reddit · 2026-09-10
A Reddit user shared a working optimization guide for running MiniMax H3 video generation locally on an AMD RX 7900 XT (20GB VRAM) with ComfyUI Desktop on Windows 11, after finding AI assistants' advice useless and experimenting manually. Speed improved significantly over defaults with no quality loss.
Performance: 25s/it at 0.8mp (1216x672, 16:9), 4 minutes total for a 5-second text-to-video generation.
Key setup:
- Launch flags: --disable-smart-memory --disable-pinned-memory --disable-triton-backend --use-sage-attention --enable-dynamic-vram
- A set of MIOpen/Triton env vars (logging off, FINDMODE=2, AMD Flash Attention enabled, etc.)
- Quantized 6-step turbo model (14GB w4a8 or 21GB int8 from Hugging Face)
- PlagueKind nodes with SLA Attention; an optional node for longer 15s videos
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