Apple Launches M5 Ultra and M6 Chips, Betting Big on On-Device AI with 512GB Unified Memory
Apple officially launched the M5 Ultra and M6 chips on August 25, doubling down on on-device AI. The M5 Ultra, billed by Apple as its most powerful chip ever, fuses two M5 Max dies via the new Ultra Fusion architecture with 4.4TB/s interconnect bandwidth, offering up to a 36-core CPU, 80-core GPU and 512GB of unified memory at 1.2TB/s—50% higher than the M3 Ultra. A single Mac Studio can now run models like DeepSeek R1 671B and Kimi K2.6 1T entirely on-device.
Confirmed
- M5 Ultra uses the Ultra Fusion four-die architecture, with up to 36-core CPU, 80-core GPU, 512GB unified memory and 1.2TB/s bandwidth, 50% higher than M3 Ultra
- The new Mac Studio comes in M5 Max and M5 Ultra versions; the M5 Ultra model starts at $5,499 with 1TB storage, configurable up to 16TB
- M6 is Apple's first 2nm chip with a 12-core CPU, 12-core GPU and dual 16-core Neural Engines, debuting in the Mac mini starting at $899 (from 6,999 RMB in China); per @量子位, AI performance improves up to 4x
- Per @MaySaki2, oversized open-source models like DeepSeek R1 671B and Kimi K2.6 1T can run locally on a single machine; per @dreamwieber, multiple Mac Studios can be linked via Thunderbolt 5 to run even larger models
Unconfirmed
- @Last-Owl-8342 speculates the M5 Ultra uses LPDDR5X and that a future M7 Ultra with DDR6 could reach 1.8TB/s—community guesses, not confirmed by Apple
- A repost claiming October shipping and that stacking four M5 Ultra machines would deliver beyond-API performance for models like Kimi K3 and GLM 5.3 is personal estimation, not an official claim
Why it matters
- 512GB of unified memory makes fully local inference of ultra-large LLMs feasible, and Thunderbolt 5 clustering extends local compute ceilings, reducing reliance on cloud AI
- The 2nm M6 signals Apple's continued process leadership, paving the way for future Mac performance and efficiency gains
2026-08-25 ~ 2026-08-26 · 14 related posts
- Episode 1: Apple Reportedly Set to Launch New Mac Mini for On-Device AI(2026-08-25, 2 posts)
- Episode 2: Apple Launches M5 Ultra and M6 Chips, Betting Big on On-Device AI with 512GB Unified Memory(2026-08-25, 14 posts)
- Episode 3: Apple Launches M6 Mac Mini, Positioning It as a Local AI Machine(2026-08-25, 14 posts)
- Episode 4: Apple M6 Rumored to Pack Dual Neural Engines with 4.8x AI Gains(2026-08-25, 3 posts)
Primary sources
- Apple unveils M5 Ultra chip for 3D rendering and frontier AI models — Polymarket · 2026-08-25
- Apple unveils new Mac Studio with M5 Ultra, up to 512GB unified memory — themixtergames · 2026-08-25
- M5 Ultra bandwidth hits 1.2TB/s, LPDDR5X memory suspected — Last-Owl-8342 · 2026-08-25
- [source] Apple launches M6 and M5 Ultra chips: 2nm process and quad-die architecture — Dimillian · 2026-08-25
- Apple Unveils M6 and M5 Ultra Chips with Up to 512GB RAM for Local AI — rohanpaul_ai · 2026-08-25
- [source] Apple goes all-in on local AI: M5 Ultra hits 512GB unified memory, Mac mini from $899 — haider1 · 2026-08-25
- Apple unveils M5 Ultra with up to 80-core GPU and 1.2TB/s memory bandwidth — JosephJacks_ · 2026-08-26
- M5 Ultra rumored with 1.2TB/s bandwidth, beating API speeds for local LLMs — StefanoGogioso · 2026-08-26
- Apple M5 Ultra Supports Up to 512GB Memory for Local LLMs — dreamwieber · 2026-08-26
- Apple M5 Ultra with 512GB Memory Runs Massive Open-Weight Models Locally — MaySaki2 · 2026-08-26
- Apple's M5 Max and M5 Ultra Chips Promise Monumental Leap in AI Performance — SumitGup · 2026-08-26