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.
- 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 benchmark or a guarantee. Even the “comfortable” 70B 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.
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 guidePurchase status
Refurbished only
Buy used or refurbished only when condition, warranty, and returns are clearly documented.
- Generation
- M1-Ultra
- Released
- 2022
- Catalog data checked
At a glance
Technical Specs
- 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
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.
Data verified
Catalog specifications last reviewed on July 28, 2026; merchant links can have different dates. Live checkout prices, inventory and AI inference speeds have not been independently verified here.
Apple technical source Technical data follows Apple specifications; not an independent performance guarantee.
Compare before buying
Similar Macs
MacBook Pro M5 Max 16" (128GB)
M5-Max128 GB Unified Memory
M5 Max with 128GB unified memory and 614GB/s memory bandwidth; currently available new.
Catalog specifications checked: . No live price or inventory check. German-market offers: verify US availability, shipping, taxes and warranty.
Mac Studio M5 Max (128GB)
M5-Max128 GB Unified Memory
M5 Max with 128GB unified memory and 614GB/s memory bandwidth; currently available new.
Catalog specifications checked: . No live price or inventory check. German-market offers: verify US availability, shipping, taxes and warranty.
Mac Studio M4 Max (128GB)
M4-Max128 GB Unified Memory
M4 Max with 128GB unified memory and 546GB/s memory bandwidth; currently available new.
Catalog specifications checked: . No live price or inventory check. German-market offers: verify US availability, shipping, taxes and warranty.
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.
Catalog specifications checked: . No live price or inventory check. German-market offers: verify US availability, shipping, taxes and warranty.