Previous generation Desktop workstation · 2023

Mac Studio M2 Ultra (64 GB)

Classic for 70B in 4-bit. Previous generation — cheaper than current alternatives.

Find a current alternative Technical data

RAM: 64 GB
Bandwidth: 800 GB/s
Comfortable model range: 35B

Local AI fit

35B is the realistic daily range

Comfortable up to 35B. 70B Q4 is possible at moderate context but requires disciplined headroom.

Comfortable: 35B
Tight: 70B
Capacity edge: 70B

70B 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.

64GB 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

Previous generation

Most compelling when priced clearly below a current model with similar memory.

Generation: M2-Ultra
Released: 2023
Data checked: 2026-06-03

At a glance

Technical Specs

Desktop workstation

Chip: M2-Ultra
RAM: 64 GB
CPU cores: 24
GPU cores: 60
Memory bandwidth: 800 GB/s
Form factor: Desktop workstation
Release year: 2023

What works well

Pros

70B Q4 at moderate context
24 CPU cores

What to consider

Cons

Previous generation
Heavy

Data verified

Product data and links last checked on 2026-06-03. Prices and availability can change at any time.

Compare before buying

Similar Macs

Open Matchmaker

MacBook Pro M5 Pro 16" (64GB)

M5-Pro64 GB Unified Memory

M5 Pro with 64GB unified memory and 307GB/s memory bandwidth; currently available new.

Last checked: 2026-07-28

MacBook Pro M3 Max 16" (64GB)

M3-Max64 GB Unified Memory Refurbished only

M3 Max with 64GB unified memory and 400GB/s memory bandwidth; primarily available used or refurbished.

Last checked: 2026-07-28

MacBook Pro M1 Max 16" (64GB)

M1-Max64 GB Unified Memory Refurbished only

M1 Max with 64GB unified memory and 400GB/s memory bandwidth; primarily available used or refurbished.

Last checked: 2026-07-28

Mac Mini M4 Pro (48 GB)

M4-Pro48 GB Unified Memory12-Core CPU16-Core GPU

Sweet spot for local LLMs. 48 GB is comfortable for 30B in 4-bit, 70B is tight.

Last checked: 2026-06-03