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// RUN — FITS
Can the Apple M1 Ultra 128GB run Refact-1.6B?
Yes — here's how fast and up to what context, with real measured numbers.
Refact-1.6B on the Apple M1 Ultra 128GB
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 1686k | 170-205 t/s | ~2.1-2.6 (slow) |
| Q8 | yes | 1711k | 340-410 t/s | ~4.3-5.1 (slow) |
| Q4 | yes | 1721k | 607.1-732.1 t/s | ~7.6-9.2 (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 Refact-1.6B?▶
Yes. At Q4 it generates ~607.1-732.1 tok/s and fits up to 1721k context; beyond that it spills to SSD swap and slows to ~7.6-9.2 tok/s.
How much context fits?▶
At Q4, up to about 1721k tokens stay in fast memory; longer context spills to SSD swap and throughput collapses.