Can I Run Gemma 4 on Mac Studio (M2 Ultra, 192 GB)?
Written by Jakub Rusinowski · Last updated June 3, 2026
Yes — comfortably
Yes, comfortably — Gemma 4 31B at Q8_0 needs about 35.5 GB of the 144 GB usable on Mac Studio (M2 Ultra, 192 GB), leaving ~108.5 GB spare and running at ~12.5 tok/s (estimated), with room for about 131,072 tokens of context.
Confidence: medium · Recommended quantization: Q8_0 · Estimated speed: ~12.5 tok/s
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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 |
Gemma 4 on Mac Studio (M2 Ultra, 192 GB): memory by quantization
| Quant | Memory needed | Fits 144 GB? | Max context | Est. speed | Download |
|---|---|---|---|---|---|
| F16 | 64.6 GB | ✓ Yes | 128K | ~6.8 tok/s | 62 GB |
| Q8_0 | 35.5 GB | ✓ Yes | 128K | ~12.5 tok/s | 32.9 GB |
| Q6_K | 28 GB | ✓ Yes | 128K | ~15.9 tok/s | 25.4 GB |
| Q5_K_M | 24.6 GB | ✓ Yes | 128K | ~18.1 tok/s | 22 GB |
| Q4_K_M | 21.3 GB | ✓ Yes | 128K | ~20.9 tok/s | 18.7 GB |
| Q3_K_M | 15.8 GB | ✓ Yes | 128K | ~28.4 tok/s | 13.2 GB |
| Q2_K | 12.8 GB | ✓ Yes | 128K | ~35.3 tok/s | 10.2 GB |
Which Gemma 4 sizes fit
| Variant | Needs at Q4_K_M | Fits? | Est. speed |
|---|---|---|---|
| Gemma 4 31B | 21.3 GB | ✓ Fits | ~20.9 tok/s |
| Gemma 4 26B-A4B | 18.2 GB | ✓ Fits | ~95.6 tok/s |
| Gemma 4 12B (Unified) | 9.4 GB | ✓ Fits | ~47.6 tok/s |
| Gemma 4 E4B | 6.8 GB | ✓ Fits | ~65.3 tok/s |
| Gemma 4 E2B | 4.9 GB | ✓ Fits | ~89.5 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- Superseded by the M3 Ultra, which is why it is often the better used buy for large-model work.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 Gemma 4 on Mac Studio (M2 Ultra, 192 GB)?
Yes, comfortably — Gemma 4 31B at Q8_0 needs about 35.5 GB of the 144 GB usable on Mac Studio (M2 Ultra, 192 GB), leaving ~108.5 GB spare and running at ~12.5 tok/s (estimated), with room for about 131,072 tokens of context.
Which quantization of Gemma 4 should I use on Mac Studio (M2 Ultra, 192 GB)?
Q8_0 — it needs about 35.5 GB of the 144 GB available, downloads as roughly 32.9 GB, and runs at an estimated 12.5 tokens/sec with up to 128K of context.
What limits Gemma 4 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
Other Models on Mac Studio (M2 Ultra, 192 GB)
- GLM-4.7 / GLM-Z1 on Mac Studio (M2 Ultra, 192 GB)
- GLM-5 / GLM-5.1 on Mac Studio (M2 Ultra, 192 GB)
- GLM-5.3-Flash on Mac Studio (M2 Ultra, 192 GB)
- GLM-6 on Mac Studio (M2 Ultra, 192 GB)
- GPT-OSS on Mac Studio (M2 Ultra, 192 GB)
Gemma 4 on GPUs
- Gemma 4 on NVIDIA GeForce RTX 5090
- Gemma 4 on NVIDIA GeForce RTX 5080
- Gemma 4 on NVIDIA GeForce RTX 5070 Ti
- Gemma 4 on NVIDIA GeForce RTX 5070