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// RUN — FITS
Can the Apple M2 Ultra 192GB run Stable Diffusion 3 Medium?
Yes — here's how fast and up to what context, with real measured numbers.
Stable Diffusion 3 Medium on the Apple M2 Ultra 192GB
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 2538k | 108.8-131.2 t/s | ~1.4-1.6 (slow) |
| Q8 | yes | 2576k | 217.6-262.4 t/s | ~2.7-3.3 (slow) |
| Q4 | yes | 2592k | 388.6-468.6 t/s | ~4.9-5.9 (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 M2 Ultra 192GB run Stable Diffusion 3 Medium?▶
Yes. At Q4 it generates ~388.6-468.6 tok/s and fits up to 2592k context; beyond that it spills to SSD swap and slows to ~4.9-5.9 tok/s.
How much context fits?▶
At Q4, up to about 2592k tokens stay in fast memory; longer context spills to SSD swap and throughput collapses.