Can I Run Devstral on MacBook Pro 16" (M4 Max, 128 GB)?

Autor: Jakub Rusinowski · Ostatnia aktualizacja: 11 września 2026

Yes — comfortably

Yes, comfortably — Devstral-2 123B at Q3_K_M needs about 56.1 GB of the 96 GB usable on MacBook Pro 16" (M4 Max, 128 GB), leaving ~39.9 GB spare and running at ~5.5 tok/s (estimated), with room for about 65,536 tokens of context.

Confidence: medium · Recommended quantization: Q3_K_M · Estimated speed: ~5.5 tok/s

See what else this hardware can run →

Kup ten sprzęt Apple MacBook Pro M5 Max — 128 GB unified memory · 614 GB/s Uruchom w chmurze NVIDIA A100 80GB w RunPod — od $1.39/godz. · stawka sprawdzona 2026-07

lub porównaj w Vast.ai od $0.77/godz. (typical low · varies)

Jako partner Amazon zarabiamy na kwalifikujących się zakupach. Linki do chmurowych GPU są linkami polecającymi — możemy otrzymać prowizję bez dodatkowych kosztów dla Ciebie.

MacBook Pro 16" (M4 Max, 128 GB) — what it gives a model

Usable memory for models	96 GB
Memory bandwidth	546 GB/s
Form factor	Laptop
Operating system	macOS
Memory upgradeable	No — soldered

Devstral on MacBook Pro 16" (M4 Max, 128 GB): memory by quantization

Quant	Memory needed	Fits 96 GB?	Max context	Est. speed	Download
F16	249.7 GB	✗ No	—	—	246 GB
Q8_0	134.4 GB	✗ No	—	—	130.7 GB
Q6_K	104.5 GB	✗ No	—	—	100.9 GB
Q5_K_M	90.9 GB	✓ Yes	16K	~3.3 tok/s	87.2 GB
Q4_K_M	77.9 GB	✓ Yes	32K	~3.9 tok/s	74.3 GB
Q3_K_M	56.1 GB	✓ Yes	64K	~5.5 tok/s	52.4 GB
Q2_K	44.1 GB	✓ Yes	128K	~7 tok/s	40.4 GB

Which Devstral sizes fit

Variant	Needs at Q4_K_M	Fits?	Est. speed
Devstral-2 123B	77.9 GB	✓ Fits	~3.9 tok/s
Devstral Small 2505 24B	16.6 GB	✓ Fits	~18.6 tok/s
Devstral Small 2 24B	16.6 GB	✓ Fits	~18.6 tok/s

What to watch out for

Q3_K_M is the only quantization that fits, and it is a heavily degraded one — expect noticeably worse output than the same model at Q4_K_M. A smaller model at Q4 is usually the better trade.
This model does not publish its full attention configuration, so the KV-cache share of these figures is inferred from its parameter count rather than computed exactly.
Memory on this machine is not upgradeable, so the configuration you buy is the ceiling for every model you will ever run on it.

MacBook Pro M4 Max 128 GB limitations

Unified memory is soldered — the 128 GB decision is permanent and cannot be upgraded later.
Sustained decode speed on battery is materially below the plugged-in figures quoted here.

Recommended setup

Ollama or LM Studio (Metal) — MLX for the fastest Apple-native throughput

How these numbers are calculated

Memory need = quantized weights + KV cache at 8,192 tokens (f16) + 0.8 GB runtime overhead.
128 GB unified memory at 546 GB/s, shared between CPU and GPU.
macOS reserves a share of unified memory for the system, so not all of it is available to a model.
Throughput is a memory-bandwidth roofline estimate, not a measurement. It is labelled "estimated" everywhere it appears.
KV cache is inferred from the parameter count because this model does not publish its full attention configuration.

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