Mac Studio (M5 Ultra, 512 GB) — Local LLM Performance

Mac Studio (M5 Ultra, 512 GB) is a Desktop running macOS, with 512 GB unified memory.

Specifications

Memory for models	512 GB unified
Memory bandwidth	1,229 GB/s
Memory upgradeable	No — soldered, decided at purchase
Chip	Apple M5 Ultra
Architecture	ARM, 3nm TSMC
Form factor	Desktop
Operating system	macOS
Released	2026
Llama 3.1 8B Q4_K_M	59–123 tok/s

Worth knowing before you buy

• Memory is soldered; the configuration cannot be changed after purchase.
• The 512 GB configuration is the most unified memory available in any off-the-shelf machine.

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