Stable Diffusion 3 Medium on Apple M3 Pro (18GB Unified)
Apple M3 Pro (18GB Unified) handles Stable Diffusion 3 Medium well at FP16. A solid choice for this model.
Model Size
2B
Device VRAM
18 GB
Bandwidth
150 GB/s
Quantizations Tested
1
Performance by Quantization
Each row shows Stable Diffusion 3 Medium performance at a different quality level on Apple M3 Pro (18GB Unified).
| Quantization | Speed | TTFT | Fits in VRAM | Rating | Confidence |
|---|---|---|---|---|---|
| FP16 | — | — | ✓ Yes | Good | estimated |
Notes
FP16
5GB fits. Good for SD3 medium quality images.
About Stable Diffusion 3 Medium
Stable Diffusion 3 Medium (2B) is a image gen model. Stability AI's SD3 medium model for high-quality image generation.
View all Stable Diffusion 3 Medium hardware options →About Apple M3 Pro (18GB Unified)
Apple M3 Pro (18GB Unified) has 18 GB at 150 GB/s. Available in MacBook Pro 14", MacBook Pro 16".
See all models Apple M3 Pro (18GB Unified) can run →Source: MLX performance estimates (2026-03-15)
Data last updated: 2026-03-15