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.
More from Multimodal
- 324 Image Prompts and 42 AI Video Camera Movements Released — emmanuelvivier · 2026-08-08
- Testing H3 Text-to-Video on 'Mr. Robot': Stunning Atmosphere But Inconsistent Likeness — Positive_Writing_883 · 2026-08-08
- ComfyUI video gen issue: Batman's fins morph into feather-like flaps—how to keep consistency? — Guyserbun007 · 2026-08-08
- Ultra-Realistic Digital Humans from a Single Camera: New SIGGRAPH Asia Research — Scobleizer · 2026-08-08
- Grok Imagine 2.0 Surpasses ChatGPT in Image Generation Use Cases — ns123abc · 2026-08-08
- Open Video Model Sulphur Reaches 87% Funding, Calls for Community Datasets — FusionCow · 2026-08-08