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// RUN — FITS
Can the Apple M1 Ultra 64GB run minChatGPT?
Yes — here's how fast and up to what context, with real measured numbers.
minChatGPT on the Apple M1 Ultra 64GB
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 806k | 166-200.1 t/s | ~2.1-2.5 (slow) |
| Q8 | yes | 831k | 331.9-400.2 t/s | ~4.1-5 (slow) |
| Q4 | yes | 842k | 592.7-714.7 t/s | ~7.4-8.9 (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 64GB run minChatGPT?▶
Yes. At Q4 it generates ~592.7-714.7 tok/s and fits up to 842k context; beyond that it spills to SSD swap and slows to ~7.4-8.9 tok/s.
How much context fits?▶
At Q4, up to about 842k tokens stay in fast memory; longer context spills to SSD swap and throughput collapses.