Can I Run MiniMax M2.5 on Mac Studio (M3 Ultra, 256 GB)?

作者： Jakub Rusinowski · 最后更新： 2026年2月15日

Yes — comfortably

Yes, comfortably — MiniMax M2.5 230B at Q2_K needs about 79.9 GB of the 192 GB usable on Mac Studio (M3 Ultra, 256 GB), leaving ~112.1 GB spare and running at ~5.7 tok/s (estimated), with room for about 262,144 tokens of context.

Confidence: medium · Recommended quantization: Q2_K · Estimated speed: ~5.7 tok/s

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Mac Studio (M3 Ultra, 256 GB) — what it gives a model

Usable memory for models	192 GB
Memory bandwidth	819 GB/s
Form factor	Desktop
Operating system	macOS
Memory upgradeable	No — soldered

MiniMax M2.5 on Mac Studio (M3 Ultra, 256 GB): memory by quantization

Quant	Memory needed	Fits 192 GB?	Max context	Est. speed	Download
F16	464.3 GB	✗ No	—	—	460 GB
Q8_0	248.7 GB	✗ No	—	—	244.4 GB
Q6_K	192.9 GB	✗ No	—	—	188.6 GB
Q5_K_M	167.3 GB	✓ Yes	64K	~2.7 tok/s	163 GB
Q4_K_M	143.2 GB	✓ Yes	64K	~3.2 tok/s	138.9 GB
Q3_K_M	102.4 GB	✓ Yes	128K	~4.4 tok/s	98 GB
Q2_K	79.9 GB	✓ Yes	256K	~5.7 tok/s	75.6 GB

What to watch out for

Q2_K 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.

Mac Studio M3 Ultra 256 GB limitations

The largest single-box unified memory pool available, but at roughly half the memory bandwidth of a high-end discrete GPU — very large models load, then run slowly.
Memory is soldered; the configuration chosen at purchase is permanent.

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.
256 GB unified memory at 819 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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