Can I Run Mistral Medium 3.5 128B on a Apple M5 Ultra (256GB)?
Runs comfortably at Q6_K — minimal quality loss.
4 quantizations fit your 256GB
| Quant | Min VRAM | Recommended | File size | Headroom |
|---|---|---|---|---|
| Q6_KBEST | 106.2 GB | 107.7 GB | 102.6 GB | +149.8 GB |
| Q5_K_M | 91.7 GB | 93.2 GB | 88.3 GB | +164.3 GB |
| Q4_K_M | 78.4 GB | 79.9 GB | 74.9 GB | +177.6 GB |
| Q2_K | 43.0 GB | 44.5 GB | 46.6 GB | +213.0 GB |
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FAQ
Can the Apple M5 Ultra (256GB) run Mistral Medium 3.5 128B?
Yes. The Apple M5 Ultra (256GB)'s 256GB of unified memory is enough to run Mistral Medium 3.5 128B at Q6_K quantization (106.2GB required).
What's the best quantization to use?
Q6_K is the highest-precision quantization that fits in your 256GB. It uses about 106.2GB of memory and 107.7GB 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.