Can I Run Nex-N1 on Apple M3 Ultra?
作者： Jakub Rusinowski · 最后更新： 2026年9月8日
Only with offload — Nex-N1 spills onto CPU/system RAM on the Apple M3 Ultra (512 GB), so expect a large speed penalty.
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Apple M3 Ultra Specs
| VRAM | 512 GB unified memory |
| Memory Bandwidth | 819 GB/s |
DeepSeek-V3.1-Nex-N1 671B on the Apple M3 Ultra: VRAM by quantization
| Quant | VRAM needed | Fits 512 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 1343.1 GB | ✗ No | — | — |
| Q8_0 | 714 GB | ✗ No | — | — |
| Q6_K | 551.3 GB | ✗ No | — | — |
| Q5_K_M | 476.7 GB | ✓ Yes | 64K | — |
| Q4_K_M | 406.2 GB | ✓ Yes | 64K | — |
| Q3_K_M | 287.1 GB | ✓ Yes | 64K | — |
| Q2_K | 221.7 GB | ✓ Yes | 64K | — |
Assumes a 4K-token context with an f16 KV cache. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 512 GB of unified memory. Figures are estimates from parameter count, quantization and memory bandwidth — the analyzer lets you tune KV-cache quant and context.
Context costs VRAM too. At Q4_K_M on the Apple M3 Ultra: 8K 406.5 GB · 32K 408.2 GB · 125K 414.9 GB. Every window this model publishes still fits 512 GB.
Why It Does Not Fit
Every Nex-N1 variant requires more VRAM than the Apple M3 Ultra provides (512 GB).
Nex-N1 needs ~405 GB but this GPU has 512 GB. Rent a 8× H100 (640 GB)-class GPU by the hour instead of buying one:
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Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.
FAQ
Does the Apple M3 Ultra have enough VRAM for Nex-N1?
Only with offload — Nex-N1 spills onto CPU/system RAM on the Apple M3 Ultra (512 GB), so expect a large speed penalty.
Nex-N1 on Other GPUs
Popular Models on the Apple M3 Ultra
VRAM Tier
Troubleshooting
- Ollama: "model requires more system memory than is available"
- Out of memory at long context (the KV cache, not the weights)
Buying Guide
← Can I Run It? | Nex-N1 Model Page | Apple M3 Ultra GPU Page | Check Your Hardware