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// RUN — FITS
Can the Apple M4 Max 128GB run mBART-50?
Yes — here's how fast and up to what context, with real measured numbers.
mBART-50 on the Apple M4 Max 128GB
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 1716k | 304.3-367 t/s | ~5.6-6.7 (slow) |
| Q8 | yes | 1726k | 608.7-734 t/s | ~11.1-13.4 (slow) |
| Q4 | yes | 1730k | 1086.9-1310.7 t/s | ~19.9-24 (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 M4 Max 128GB run mBART-50?▶
Yes. At Q4 it generates ~1086.9-1310.7 tok/s and fits up to 1730k context; beyond that it spills to SSD swap and slows to ~19.9-24 tok/s.
How much context fits?▶
At Q4, up to about 1730k tokens stay in fast memory; longer context spills to SSD swap and throughput collapses.