Can I Run Qwen 3.5 397B A17B on a Apple M3 Ultra (512GB)?
Runs at Q8_0 — near-lossless quality.
4 quantizations fit your 512GB
| Quant | Min VRAM | Recommended | File size | Headroom |
|---|---|---|---|---|
| Q8_0BEST | 422.8 GB | 424.3 GB | 421.8 GB | +89.2 GB |
| Q6_K | 328.0 GB | 329.5 GB | 327.0 GB | +184.0 GB |
| Q5_K_M | 282.9 GB | 284.4 GB | 281.9 GB | +229.1 GB |
| Q4_K_M | 241.7 GB | 243.2 GB | 240.7 GB | +270.3 GB |
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Top-ranked open-source models that fit in 512GB.
FAQ
Can the Apple M3 Ultra (512GB) run Qwen 3.5 397B A17B?
Yes. The Apple M3 Ultra (512GB)'s 512GB of unified memory is enough to run Qwen 3.5 397B A17B at Q8_0 quantization (422.8GB required).
What's the best quantization to use?
Q8_0 is the highest-precision quantization that fits in your 512GB. It uses about 422.8GB of memory and 424.3GB 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.