FastH3 V2

Headlines · 1

1. Oct 8
   MiniMax H3 live video generation on a single RTX 5090

   A Comfy blog post presents ComfyStreamerH3, an open-source custom ComfyUI node that runs MiniMax H3 on one 32GB RTX 5090, producing 15 seconds of 448×256 video in 15 seconds or less with a four-step setup. The listed optimizations include sparse attention that applies full attention to only about 20% of video blocks, NicoLab28's ClipProj adapting Qwen3-VL-4B as a stand-in for H3's 32B text encoder (about 4.5GB vs 15.7GB), FastVideo's pruned INT8 checkpoint, a fused FP4 MLP, and Kijai's INT8 tiled decoder overlapped with NVENC encoding, cutting VRAM needs from 80GB to under 30GB. The author says running such models continuously can cost upwards of $6,000 per day while RTX 5090 rentals start near 70 cents an hour, and notes FastVideo's Preview V1 took 47.2 seconds for a 15-second 1344×768 clip on one B200. The clips still show visible artifacts, and the author suggests passing them through a cheap upscaler such as SolRefinery.

   Comfy Blog · 🔥 0

Experience and discussion from the community

Share my FastH3 V2 experienceAsk about FastH3 V2