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// RUN — FITS
Can the Apple M1 Ultra 128GB run BART-IT?
Yes — here's how fast and up to what context, with real measured numbers.
BART-IT on the Apple M1 Ultra 128GB
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 1731k | 1942.9-2342.9 t/s | ~24.3-29.3 (slow) |
| Q8 | yes | 1733k | 3885.7-4685.7 t/s | ~48.6-58.6 (slow) |
| Q4 | yes | 1734k | 6938.8-8367.3 t/s | ~86.7-104.6 (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 BART-IT?▶
Yes. At Q4 it generates ~6938.8-8367.3 tok/s and fits up to 1734k context; beyond that it spills to SSD swap and slows to ~86.7-104.6 tok/s.
How much context fits?▶
At Q4, up to about 1734k tokens stay in fast memory; longer context spills to SSD swap and throughput collapses.