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// RUN — FITS
Can the Apple M1 Ultra 128GB run ruGPT-3.5 13B?
Yes — here's how fast and up to what context, with real measured numbers.
ruGPT-3.5 13B on the Apple M1 Ultra 128GB
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 535k | 20.9-25.2 t/s | ~0.3-0.3 (slow) |
| Q8 | yes | 615k | 41.8-50.5 t/s | ~0.5-0.6 (slow) |
| Q4 | yes | 650k | 74.7-90.1 t/s | ~0.9-1.1 (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 ruGPT-3.5 13B?▶
Yes. At Q4 it generates ~74.7-90.1 tok/s and fits up to 650k context; beyond that it spills to SSD swap and slows to ~0.9-1.1 tok/s.
How much context fits?▶
At Q4, up to about 650k tokens stay in fast memory; longer context spills to SSD swap and throughput collapses.