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// RUN — FITS
Can the Apple M1 Ultra 64GB run WizardCoder-15.5B?
Yes — here's how fast and up to what context, with real measured numbers.
WizardCoder-15.5B on the Apple M1 Ultra 64GB
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 96k | 17.5-21.2 t/s | ~0.2-0.3 (slow) |
| Q8 | yes | 155k | 35.1-42.3 t/s | ~0.4-0.5 (slow) |
| Q4 | yes | 181k | 62.7-75.6 t/s | ~0.8-0.9 (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 M1 Ultra 64GB run WizardCoder-15.5B?▶
Yes. At Q4 it generates ~62.7-75.6 tok/s and fits up to 181k context; beyond that it spills to SSD swap and slows to ~0.8-0.9 tok/s.
How much context fits?▶
At Q4, up to about 181k tokens stay in fast memory; longer context spills to SSD swap and throughput collapses.