apple
SOC
256GB unified
enthusiast
Apple M4 Ultra
Two-chip Ultra fusing two M4 Max dies. Up to 256GB unified memory at 1.1 TB/s. The single highest-VRAM consumer rig you can buy in a Mac Studio.
Released 2025
Overview
Two-chip Ultra fusing two M4 Max dies. Up to 256GB unified memory at 1.1 TB/s. The single highest-VRAM consumer rig you can buy in a Mac Studio.
Specs
| VRAM | 0 GB |
| System RAM (typical) | 256 GB |
| Power draw | 200 W |
| Released | 2025 |
| Backends | Metal MLX |
Frequently asked
Does Apple M4 Ultra support CUDA?
No — Apple M4 Ultra uses Apple Metal and MLX, not CUDA. Most local-AI tools support Metal natively.
Reviewed by RunLocalAI Editorial. See our editorial policy for how we research and verify hardware specifications.