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// RUN — FITS
Can the Apple M4 Max 128GB run GPT-J-6B?
Yes — here's how fast and up to what context, with real measured numbers.
GPT-J-6B on the Apple M4 Max 128GB
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 775k | 30.7-37 t/s | ~0.6-0.7 (slow) |
| Q8 | yes | 821k | 61.3-74 t/s | ~1.1-1.4 (slow) |
| Q4 | yes | 842k | 109.5-132.1 t/s | ~2-2.4 (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 M4 Max 128GB run GPT-J-6B?▶
Yes. At Q4 it generates ~109.5-132.1 tok/s and fits up to 842k context; beyond that it spills to SSD swap and slows to ~2-2.4 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.