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// RUN — FITS
Can the Apple M4 Max 48GB run CausalLM 14B?
Yes — here's how fast and up to what context, with real measured numbers.
CausalLM 14B on the Apple M4 Max 48GB
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 75k | 12.6-15.2 t/s | ~0.2-0.3 (slow) |
| Q8 | yes | 165k | 25.3-30.5 t/s | ~0.5-0.6 (slow) |
| Q4 | yes | 204k | 45.1-54.4 t/s | ~0.8-1 (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 48GB run CausalLM 14B?▶
Yes. At Q4 it generates ~45.1-54.4 tok/s and fits up to 204k context; beyond that it spills to SSD swap and slows to ~0.8-1 tok/s.
How much context fits?▶
At Q4, up to about 204k tokens stay in fast memory; longer context spills to SSD swap and throughput collapses.