Can I Run IBM Granite 4.1 on Mac Studio (M2 Ultra, 192 GB)?

Written by Jakub Rusinowski · Last updated April 29, 2026

Mac Studio (M2 Ultra, 192 GB) — what it gives a model

Usable memory for models	144 GB
Memory bandwidth	800 GB/s
Form factor	Desktop
Operating system	macOS
Memory upgradeable	No — soldered

IBM Granite 4.1 on Mac Studio (M2 Ultra, 192 GB): memory by quantization

Quant	Memory needed	Fits 144 GB?	Max context	Est. speed	Download
F16	62.6 GB	✓ Yes	128K	~7 tok/s	60 GB
Q8_0	34.5 GB	✓ Yes	128K	~12.9 tok/s	31.9 GB
Q6_K	27.2 GB	✓ Yes	128K	~16.4 tok/s	24.6 GB
Q5_K_M	23.8 GB	✓ Yes	128K	~18.7 tok/s	21.3 GB
Q4_K_M	20.7 GB	✓ Yes	128K	~21.6 tok/s	18.1 GB
Q3_K_M	15.4 GB	✓ Yes	128K	~29.2 tok/s	12.8 GB
Q2_K	12.4 GB	✓ Yes	128K	~36.3 tok/s	9.9 GB

Which IBM Granite 4.1 sizes fit

Variant	Needs at Q4_K_M	Fits?	Est. speed
Granite 4.1 30B	20.7 GB	✓ Fits	~21.6 tok/s
Granite 4.1 8B	6.8 GB	✓ Fits	~65.3 tok/s
Granite 4.1 3B	3.5 GB	✓ Fits	~123.7 tok/s

What to watch out for

• 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 M2 Ultra 192 GB limitations

• Superseded by the M3 Ultra, which is why it is often the better used buy for large-model work.
• 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.
• 192 GB unified memory at 800 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.

FAQ

Can I run IBM Granite 4.1 on Mac Studio (M2 Ultra, 192 GB)?

Yes, comfortably — Granite 4.1 30B at Q8_0 needs about 34.5 GB of the 144 GB usable on Mac Studio (M2 Ultra, 192 GB), leaving ~109.5 GB spare and running at ~12.9 tok/s (estimated), with room for about 131,072 tokens of context.

Which quantization of IBM Granite 4.1 should I use on Mac Studio (M2 Ultra, 192 GB)?

Q8_0 — it needs about 34.5 GB of the 144 GB available, downloads as roughly 31.9 GB, and runs at an estimated 12.9 tokens/sec with up to 128K of context.

What limits IBM Granite 4.1 on Mac Studio (M2 Ultra, 192 GB)?

Nothing binding — the model fits with headroom and generates at a usable speed on this hardware.

Which runtime should I use?

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

Other Computers

• IBM Granite 4.1 on RTX 4090 desktop
• IBM Granite 4.1 on RTX 5090 desktop
• IBM Granite 4.1 on Mac Studio M3 Ultra 256 GB
• IBM Granite 4.1 on RTX 3090 desktop

Other Models on Mac Studio (M2 Ultra, 192 GB)

• InternLM 3 on Mac Studio (M2 Ultra, 192 GB)
• Llama 3.1 Family on Mac Studio (M2 Ultra, 192 GB)
• Llama 3.2 Family on Mac Studio (M2 Ultra, 192 GB)
• Llama 3.2 Vision on Mac Studio (M2 Ultra, 192 GB)
• Llama 3.3 on Mac Studio (M2 Ultra, 192 GB)

IBM Granite 4.1 on GPUs

• IBM Granite 4.1 on NVIDIA GeForce RTX 5070
• IBM Granite 4.1 on NVIDIA GeForce RTX 5060 Ti 8GB
• IBM Granite 4.1 on NVIDIA GeForce RTX 5060
• IBM Granite 4.1 on NVIDIA GeForce RTX 4070 Ti

What This Model Is Good At

• Best local LLMs for reasoning
• Best local LLMs for rag
• Best local LLMs for research

Model & Tools

• IBM Granite 4.1 model page
• VRAM calculator
• Check your own hardware

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