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// RUN — FITS
Can the Apple M1 Ultra 128GB run MegaMolBART?
Yes — here's how fast and up to what context, with real measured numbers.
MegaMolBART on the Apple M1 Ultra 128GB
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 1734k | 6044.4-7288.9 t/s | ~75.6-91.1 (slow) |
| Q8 | yes | 1734k | 12088.9-14577.8 t/s | ~151.1-182.2 (slow) |
| Q4 | yes | 1735k | 21587.3-26031.7 t/s | ~269.8-325.4 (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 MegaMolBART?▶
Yes. At Q4 it generates ~21587.3-26031.7 tok/s and fits up to 1735k context; beyond that it spills to SSD swap and slows to ~269.8-325.4 tok/s.
How much context fits?▶
At Q4, up to about 1735k tokens stay in fast memory; longer context spills to SSD swap and throughput collapses.