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// RUN — FITS
Can the Apple M1 Ultra 128GB run Stable Diffusion 3.5 Large?
Yes — here's how fast and up to what context, with real measured numbers.
Stable Diffusion 3.5 Large on the Apple M1 Ultra 128GB
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 744k | 33.6-40.5 t/s | ~0.4-0.5 (slow) |
| Q8 | yes | 806k | 67.2-81 t/s | ~0.8-1 (slow) |
| Q4 | yes | 833k | 119.9-144.6 t/s | ~1.5-1.8 (slow) |
Estimate (memory-bound). Beyond "max context" the KV cache spills to SSD swap and speed drops to the "beyond" figure.
FAQ
Can the Apple M1 Ultra 128GB run Stable Diffusion 3.5 Large?▶
Yes. At Q4 it generates ~119.9-144.6 tok/s and fits up to 833k context; beyond that it spills to SSD swap and slows to ~1.5-1.8 tok/s.
How much context fits?▶
At Q4, up to about 833k tokens stay in fast memory; longer context spills to SSD swap and throughput collapses.