Lao Guo's Learning Space

Sep 28, 2026 · Artificial Intelligence

MiniMax H3 on Mac Studio M5 Ultra: 256GB RAM Fits 33B Model, But 45x Slower Than RTX 4090

The author tests MiniMax H3, a 33B open-source multimodal video model with native stereo audio, on a Mac Studio M5 Ultra 256GB using ComfyUI and vpipe, achieving 768p 5-second clips in 2 minutes 22 seconds optimized, highlighting the Mac's massive unified memory advantage but 45x slower inference versus RTX 4090, plus licensing and hardware decision guidance.