Can I Run Gemma 4 31B on a Apple M3 Ultra (192GB)?
Runs at full precision (f32). Zero quality loss.
12 quantizations fit your 192GB
| Quant | Min VRAM | Recommended | File size | Headroom |
|---|---|---|---|---|
| f32BEST | 126.2 GB | 127.7 GB | 2.3 GB | +65.8 GB |
| fp16 | 63.6 GB | 65.1 GB | 0.9 GB | +128.4 GB |
| Q8_0 | 34.3 GB | 35.8 GB | 0.5 GB | +157.7 GB |
| Q6_K | 26.8 GB | 28.3 GB | 25.2 GB | +165.2 GB |
| Q5_K_M | 23.2 GB | 24.7 GB | 21.7 GB | +168.8 GB |
| Q5_K_S | 22.6 GB | 24.1 GB | 21.1 GB | +169.4 GB |
| Q4_1 | 20.6 GB | 22.1 GB | 19.1 GB | +171.4 GB |
| Q4_K_M | 20.0 GB | 21.5 GB | 18.3 GB | +172.0 GB |
| Q4_K_S | 18.9 GB | 20.4 GB | 17.4 GB | +173.1 GB |
| Q4_0 | 18.6 GB | 20.1 GB | 17.3 GB | +173.4 GB |
| Q3_K_M | 14.1 GB | 15.6 GB | 14.7 GB | +177.9 GB |
| Q3_K_S | 13.1 GB | 14.6 GB | 13.2 GB | +178.9 GB |
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All quant variants, benchmark scores, and use-case tags.
Top-ranked open-source models that fit in 192GB.
FAQ
Can the Apple M3 Ultra (192GB) run Gemma 4 31B?
Yes. The Apple M3 Ultra (192GB)'s 192GB of unified memory is enough to run Gemma 4 31B at f32 quantization (126.2GB required).
What's the best quantization to use?
f32 is the highest-precision quantization that fits in your 192GB. It uses about 126.2GB of memory and 127.7GB recommended for comfortable inference.
What if I need more headroom for context length?
KV cache memory grows with context length. The numbers above assume a baseline 2K-4K context. For long-context use (32K+), add another 2-6GB depending on the model architecture.