Can I Run Nex-N2.5 Pro on Apple M3 Ultra?

Name: LLM Configurator — GPU VRAM Checker
Author: LLM Configurator

Written by Jakub Rusinowski · Last updated September 8, 2026

Yes. Nex-N2.5 Pro needs 239.7 GB at Q4_K_M and the Apple M3 Ultra has 512 GB, leaving about 272.3 GB of headroom, at roughly 33 tok/s (estimated) with room for up to 128K of context.

The numbers

Model	Nex-N2.5 Pro
Parameters	397B (17B active)
Quantization	Q4_K_M
VRAM needed	239.7 GB
Apple M3 Ultra VRAM	512 GB
Verdict	Runs
Max context	128K
Estimated speed	~33 tok/s

What to do next

Nothing to change — run it at Q4_K_M. If you want more capability, check whether the next size up also fits.

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Running Nex-N2.5 Pro on this card:

Apple Mac Studio M3 Ultra

512 GB VRAM · 60 W board power

2026 prices are volatile — check the current listing.

Check price on Amazon

Buy vs. rent Nex-N2.5 Pro

Buy the GPU

~$3,999

Apple M3 Ultra · MSRP

Rent by the hour

from $23.12/hr

8× H100 (640 GB) class

At 2 hrs/day, buying (~$3,999) beats renting at $23.12/hr after about 3 months.

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RunPod $23.12/hr

Rent on RunPod →

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 Ultra

Nex-N2.5 Max — does not fit (966.0 GB)
Nex-N2.5 mini — runs (21.1 GB)

Nex-N2.5 Pro on nearby hardware

NVIDIA L40S (48 GB) — does not fit

All Nex-N2.5 sizes on the Apple M3 Ultra | VRAM calculator for Nex-N2.5 Pro | Apple M3 Ultra GPU page | Check your hardware