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// RUN — FITS
Can the Apple M1 Ultra 128GB run Yi-1.5-9B?
Yes — here's how fast and up to what context, with real measured numbers.
Yi-1.5-9B on the Apple M1 Ultra 128GB
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 733k | 30.8-37.1 t/s | ~0.4-0.5 (slow) |
| Q8 | yes | 800k | 61.6-74.3 t/s | ~0.8-0.9 (slow) |
| Q4 | yes | 830k | 110-132.7 t/s | ~1.4-1.7 (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 Yi-1.5-9B?▶
Yes. At Q4 it generates ~110-132.7 tok/s and fits up to 830k context; beyond that it spills to SSD swap and slows to ~1.4-1.7 tok/s.
How much context fits?▶
At Q4, up to about 830k tokens stay in fast memory; longer context spills to SSD swap and throughput collapses.