Previous generation Desktop workstation · 2023

Mac Studio M2 Ultra (192 GB)

Extreme unified-memory class. Roughly 200B at 4-bit is tight; 405B does not fit realistically. Previous generation.

Find a current alternative Technical data

RAM: 192 GB
Bandwidth: 800 GB/s
Comfortable model range: 120B

Local AI fit

120B is the realistic daily range

Comfortable up to roughly 120B. About 200B Q4 is tight with short context; 405B requires a larger memory tier.

Comfortable: 120B
Tight: 200B
Capacity edge: 200B

200B is a capacity edge, not a benchmark or a guarantee. Even the “comfortable” 120B tier is an editorial estimate, not a tested throughput result. Actual fit depends on weight quantization, model architecture, KV-cache and context size, available RAM, backend and concurrent apps.

192GB 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
Catalog data checked: June 3, 2026

At a glance

Technical Specs

Desktop workstation

Chip: M2-Ultra
RAM: 192 GB
CPU cores: 24
GPU cores: 60
Memory bandwidth: 800 GB/s
Form factor: Desktop workstation
Release year: 2023

What works well

Pros

Up to roughly 200B at 4-bit
Multiple smaller models in parallel

What to consider

Cons

Very expensive
Power draw

Before spending money

Four checks that matter more than a model-size badge

Match the exact RAM, SSD, chip and port configuration to the linked offer. A similar product name does not establish identical hardware.
Estimate memory for your actual quantized model, chosen context and runtime; include macOS and app headroom. Do not treat “70B supported” as a throughput guarantee.
Check the complete checkout total, delivery location, seller and return conditions. Listings here are not real-time price quotes.
For used devices, inspect battery health, hardware locks, repairs and warranty before paying.

Compare other Mac memory configurations →

Data verified

Catalog specifications last reviewed on June 3, 2026; merchant links can have different dates. Live checkout prices, inventory and AI inference speeds have not been independently verified here.

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