Refurbished only Desktop workstation · 2022

Mac Studio M1 Ultra (128GB)

M1 Ultra with 128GB unified memory and 800GB/s memory bandwidth; primarily available used or refurbished.

Find a current alternative Technical data

RAM: 128 GB
Bandwidth: 800 GB/s
Comfortable model range: 70B

Local AI fit

70B is the realistic daily range

Capacity estimate: up to roughly 70B comfortably, 120B tightly. Context, quantization, and running apps change real-world fit.

Comfortable: 70B
Tight: 120B
Capacity edge: 120B

120B is a capacity edge, not a blanket promise: it generally requires strong weight quantization, a short context, and little parallel load. KV-cache precision and the model architecture can materially change the result.

128GB explained Why unified memory is more than model weights Understand quantization, KV cache, macOS headroom, and the difference between “fits” and “runs well.” Open RAM guide

Purchase status

Refurbished only

Buy used or refurbished only when condition, warranty, and returns are clearly documented.

Generation: M1-Ultra
Released: 2022
Data checked: 2026-07-28

At a glance

Technical Specs

Desktop workstation

Chip: M1-Ultra
RAM: 128 GB
Memory bandwidth: 800 GB/s
Form factor: Desktop workstation
Release year: 2022

What works well

Pros

128GB unified memory
800GB/s memory bandwidth

What to consider

Cons

Best sourced used or refurbished
Check battery condition on mobile devices

Data verified

Product data and links last checked on 2026-07-28. Prices and availability can change at any time.

Apple technical source Technical data follows Apple specifications; not an independent performance guarantee.

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