image model · stable-diffusion · macOS
SD Can I run Stable Diffusion 1.5 on Apple M4 Pro (48GB)?
Yes. Stable Diffusion 1.5 runs on Apple M4 Pro (48GB) at fp16 (~3.7 GB of ~32 GB usable).
Runs at fp16 using ~3.7 GB of ~32 GB usable.
- Peak VRAM
- ~3.7 GB
- Usable on device
- ~32 GB
- Device memory
- 48 GB
- Quant
- fp16
How to run it
Use AUTOMATIC1111 or ComfyUI at fp16. It conditions on an image, not a text prompt; the pipeline offloads each stage off the GPU between passes, keeping peak VRAM near the active stage.
- Type
- image (UNET)
- Parameters
- 860M
- Peak VRAM
- ~3.7 GB at fp16
- Resolution
- 512×512
- License
- CreativeML OpenRAIL-M
- Memory
- 48 GB unified
- Usable for weights
- ~32 GB
- Best runtime
- Ollama (MLX backend) / MLX direct
You could also run
Run Stable Diffusion 1.5 on other hardware
FAQ
Can Apple M4 Pro (48GB) run Stable Diffusion 1.5?
Yes. Stable Diffusion 1.5 runs on Apple M4 Pro (48GB) at fp16 (~3.7 GB of ~32 GB usable).
How much VRAM does Stable Diffusion 1.5 need?
Apple M4 Pro (48GB) has room to spare. At fp16 the realistic peak is ~3.7 GB of VRAM, versus ~4 GB with every component kept resident (no offload). With aggressive CPU offload it drops to ~2 GB, much slower.
What do I use to run Stable Diffusion 1.5 locally?
Stable Diffusion 1.5 runs in AUTOMATIC1111 or ComfyUI (among others). It loads as a diffusion checkpoint plus its image encoder and VAE, not a single chat command.
Sources
VRAM figures are sourced peak-usage anchors at the noted quant, validated 2026-06-15. See methodology.