Current model Desktop workstation · 2026
Mac Studio M5 Ultra (512GB)
M5 Ultra with 512GB unified memory and 1200GB/s memory bandwidth; currently available new.
- RAM
- 512 GB
- Bandwidth
- 1200 GB/s
- Comfortable model range
- 405B
Local AI fit
405B is the realistic daily range
Capacity estimate: up to roughly 405B comfortably, 500B tightly. Context, quantization, and running apps change real-world fit.
- Comfortable
- 405B
- Tight
- 500B
- Capacity edge
- 500B
500B is a capacity edge, not a benchmark or a guarantee. Even the “comfortable” 405B 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.
512GB 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
Current model
Catalogued as current-generation hardware. Live inventory, exact configuration and checkout price are not verified; confirm all three with the seller.
- Generation
- M5-Ultra
- Released
- 2026
- Catalog data checked
At a glance
Technical Specs
- Chip
- M5-Ultra
- RAM
- 512 GB
- Memory bandwidth
- 1200 GB/s
- Form factor
- Desktop workstation
- Release year
- 2026
What works well
Pros
- 512GB unified memory
- 1200GB/s memory bandwidth
What to consider
Cons
- Actual token rates depend on model and runtime
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.
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