Can I Run Qwen3.5-27B on a Apple M3 Ultra (512GB)?
Runs at full precision (f32). Zero quality loss.
12 quantizations fit your 512GB
| Quant | Min VRAM | Recommended | File size | Headroom |
|---|---|---|---|---|
| f32BEST | 112.2 GB | 113.7 GB | 1.8 GB | +399.8 GB |
| fp16 | 56.6 GB | 58.1 GB | 0.9 GB | +455.4 GB |
| Q8_0 | 30.5 GB | 32.0 GB | 28.6 GB | +481.5 GB |
| Q6_K | 23.9 GB | 25.4 GB | 22.4 GB | +488.1 GB |
| Q5_K_M | 20.7 GB | 22.2 GB | 19.6 GB | +491.3 GB |
| Q5_K_S | 20.2 GB | 21.7 GB | 18.9 GB | +491.8 GB |
| Q4_1 | 18.4 GB | 19.9 GB | 17.2 GB | +493.6 GB |
| Q4_K_M | 17.9 GB | 19.4 GB | 16.7 GB | +494.1 GB |
| Q4_K_S | 16.9 GB | 18.4 GB | 15.8 GB | +495.1 GB |
| Q4_0 | 16.6 GB | 18.1 GB | 15.7 GB | +495.4 GB |
| Q3_K_M | 12.6 GB | 14.1 GB | 13.5 GB | +499.4 GB |
| Q3_K_S | 11.7 GB | 13.2 GB | 12.3 GB | +500.3 GB |
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All quant variants, benchmark scores, and use-case tags.
Top-ranked open-source models that fit in 512GB.
FAQ
Can the Apple M3 Ultra (512GB) run Qwen3.5-27B?
Yes. The Apple M3 Ultra (512GB)'s 512GB of unified memory is enough to run Qwen3.5-27B at f32 quantization (112.2GB required).
What's the best quantization to use?
f32 is the highest-precision quantization that fits in your 512GB. It uses about 112.2GB of memory and 113.7GB 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.