Can I Run Gemma 4 31B (free) on a Apple M3 Ultra (512GB)?
Runs at full precision (fp16). Zero quality loss.
5 quantizations fit your 512GB
| Quant | Min VRAM | Recommended | File size | Headroom |
|---|---|---|---|---|
| fp16BEST | 63.0 GB | 64.5 GB | 62.0 GB | +449.0 GB |
| Q8_0 | 33.9 GB | 35.4 GB | 32.9 GB | +478.1 GB |
| Q6_K | 26.5 GB | 28.0 GB | 25.5 GB | +485.5 GB |
| Q5_K_M | 23.0 GB | 24.5 GB | 22.0 GB | +489.0 GB |
| Q4_K_M | 19.8 GB | 21.3 GB | 18.8 GB | +492.2 GB |
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FAQ
Can the Apple M3 Ultra (512GB) run Gemma 4 31B (free)?
Yes. The Apple M3 Ultra (512GB)'s 512GB of unified memory is enough to run Gemma 4 31B (free) at fp16 quantization (63.0GB required).
What's the best quantization to use?
fp16 is the highest-precision quantization that fits in your 512GB. It uses about 63.0GB of memory and 64.5GB 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.