Can I Run Nex-N2.5 Pro on Apple M3 Pro?
Written by Jakub Rusinowski · Last updated September 29, 2026
No. Nex-N2.5 Pro needs 244.7 GB at 8K context (239.7 GB weights + 5 GB KV cache/overhead) at Q4_K_M and the Apple M3 Pro has only 27 GB usable. No quantization we publish closes a gap that size.
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The numbers
| Model | Nex-N2.5 Pro |
| Parameters | 397B (17B active) |
| Quantization | Q4_K_M |
| VRAM needed (8K context) | 244.7 GB |
| Apple M3 Pro usable memory | 27 GB |
| Verdict | Does not fit |
Nex-N2.5 Pro on the Apple M3 Pro: VRAM by quantization
| Quant | VRAM needed | Fits 36 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 799 GB | ✗ No | — | — |
| Q8_0 | 426.8 GB | ✗ No | — | — |
| Q6_K | 330.6 GB | ✗ No | — | — |
| Q5_K_M | 286.4 GB | ✗ No | — | — |
| Q4_K_M | 244.7 GB | ✗ No | — | — |
| Q3_K_M | 174.2 GB | ✗ No | — | — |
| Q2_K | 135.5 GB | ✗ No | — | — |
Assumes an 8K-token context with an f16 KV cache, on an estimated architecture — this model publishes no config we can read. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 36 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 Pro: 8K 244.7 GB ✗ · 32K 257.4 GB ✗ · 128K 308.1 GB ✗. Past 8K it no longer fits 36 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
What to do next
Either step down to a smaller size in this family, or move to a Apple M5 Ultra (512 GB), the card with the least memory we track that holds it.
No compatible GPU? Nex-N2.5 on 24 GB of system RAM, CPU only: runs, but it is tight.
Nex-N2.5 Pro needs ~245 GB but this GPU has 36 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.
Other Nex-N2.5 sizes on the Apple M3 Pro
- Nex-N2.5 Max — does not fit (967.4 GB)
- Nex-N2.5 mini — runs (23.8 GB)
Nex-N2.5 Pro on nearby hardware
- Apple M5 (32 GB) — does not fit
- NVIDIA RTX 6000 Ada Generation (48 GB) — does not fit
All Nex-N2.5 sizes on the Apple M3 Pro | Nex-N2.5 Pro model page | Apple M3 Pro GPU page | VRAM calculator | Check your hardware