The iPhone 5's A6 SoC: Not A15 or A9, a Custom Apple Core Instead
When Apple announced the iPhone 5, Phil Schiller officially announced what had leaked several days earlier: the phone is powered by Apple's new A6 SoC. — As always, Apple didn't announce clock speeds, CPU microarchitecture, memory bandwidth or GPU details.
Context & Ripple Effects
Apple's September 12 iPhone 5 announcement put Phil Schiller on stage to confirm what had leaked days earlier: the phone runs a new A6 SoC, and per AnandTech, Apple disclosed none of the details that usually anchor a chip launch — no clock speed, no CPU microarchitecture, no memory bandwidth, no GPU specifics. The open question since early 2012 has been what is actually inside: Patently Apple's February piece on Apple's Macroscalar architecture patents fed speculation that the company was designing something beyond a stock ARM core.
The answer AnandTech lands on — a custom Apple-designed core, neither ARM's A9 nor A15 — matters because it separates Apple from every rival still shipping licensed Cortex designs. The breadth of same-day pickup across Engadget, MacRumors, VentureBeat, AppleInsider, 9to5Mac and others shows the silicon question, not the screen size, became the story technically-minded readers cared about.
First-order effects
- Apple's own microarchitecture team, not ARM's roadmap, now sets the performance ceiling of each iPhone generation — and with no official specs published, third-party teardowns and benchmarks become the only public source of truth on the A6.
- Competitors building phones on standard ARM Cortex-A9/A15 cores can no longer explain away iPhone performance gaps by pointing to identical underlying IP.
Second-order effects
- Handset rivals face pressure to fund in-house CPU design teams of their own, since licensing the same reference cores as everyone else leaves nothing to differentiate on.
- ARM's business model shifts at the top of the market: its most visible customer now buys architectural licenses and builds its own cores, weakening the reference-core story ARM sells to the rest of the industry.
Third-order effects
- If the custom-core economics hold, mobile silicon stratifies into vertically integrated vendors designing their own cores versus a commodity tier licensing ARM reference designs — with disclosure asymmetry (Apple says nothing, rivals publish datasheets) becoming a lasting feature of chip marketing.
- The pattern points toward system-level competition, where the differentiator is the co-design of silicon, OS and apps rather than component specs, raising the barrier for any new entrant without a silicon team.
The trend: Mobile SoC design is shifting from licensed ARM reference cores toward vendor-owned custom microarchitectures, with Apple as the template-setter and undisclosed specs forcing the industry to compete on measured results.