M5 Ultra Mac Studio Review: 256GB of RAM Makes It the Dream Machine for Local AI Agents
pcuenq · x · 2026-09-22
MacStories' Federico Viticci reviewed the M5 Ultra Mac Studio with 256GB of unified memory and calls it the dream machine for local AI agents.
- He compared it against the M3 Ultra (512GB) and a custom RTX 5090 desktop: the 5090 still edges ahead on memory bandwidth, but the M5 Ultra wins decisively on size, thermals, noise, and the macOS app ecosystem — and he's gone fully local.
- Key takeaway: the machine makes locally-powered personal assistants (Hermes Agent, OpenClaw) genuinely usable day-to-day with no extra cloud costs, changing his view of what local models can now enable.
Related event: M5 Ultra Mac Studio Hailed as the Dream Machine for Local AI Agents(6 posts)→
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