RTX 5090 Suffers 8.7x Slowdown Running MiniMax H3

A user running the 20GB MiniMax H3 (int8) model on an RTX 5090 (32GB) via ComfyUI reported a severe 8.7x slowdown when generating 10-second 2MP videos. The issue is suspected to be caused by VRAM thrashing.

2026-08-30 ~ 2026-08-30 · 2 related posts

• RTX 5090 MiniMax H3 performance degrades 8.7× at 2MP resolution — Suspicious-Walk-815 · 2026-08-30
• RTX 5090 runs MiniMax H3 8.7x slower than expected: VRAM thrashing? — Suspicious-Walk-815 · 2026-08-30