Running Minimax H3 1080p Locally on RTX 5090 Fails: ComfyUI & VRAM Bottlenecks
jingtianli · reddit · 2026-08-08
A developer shared their experience hitting hardware bottlenecks while trying to generate 1080p (1920x1088) videos locally using the Minimax H3 model with a PC equipped with 128GB RAM and an RTX 5090 (32GB VRAM).
- The Issue: Attempting a one-pass 10-second 1080p generation using only sage-attn (without turbo lora) failed, resulting in a noisy mess after a long wait.
- Success Threshold: The setup handles videos below 1.5MP (e.g., 1664x928) for 15 seconds perfectly, but struggles with 2.0MPs resolutions.
- Community Insight: The user suspects ComfyUI scheduling bottlenecks or insufficient VRAM, noting that successful 1080p runs on the subreddit typically rely on data-center GPUs like the B300.
Related event: RTX 5090 Runs MiniMax H3: Slow Video Generation(3 posts)→
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