Apple S9
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Apple S9
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| Designer | Apple |
|---|---|
| Introduced | September 2023 (Apple Watch Series 9, Ultra 2) |
| Type | System in Package (SiP) — 5.6 billion transistors |
| CPU | Dual-core, 64-bit — A16-generation performance cores, ~30% faster |
| Neural Engine | 4-core (first in Apple Watch) — 2× faster machine learning |
| Wireless | 2nd-generation UWB |
| Devices | Apple Watch Series 9 · Apple Watch Ultra 2 |
| Predecessor | Apple S8 |
| Successor | Apple S10 |
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The Apple S9 was the S series' biggest leap since 64-bit: 5.6 billion transistors, performance cores from the Apple A16 generation running about thirty percent faster, and the Watch's first 4-core Neural Engine. That on-device ML muscle enabled the Double Tap gesture, dictation twice as accurate, and — for the first time — Siri requests processed entirely on the wrist, health data included.
1 Legacy✎
The S9 put meaningful AI silicon on the wrist and its second-generation ultra-wideband chip made Precision Finding for a nearby iPhone possible. Its T8310 architecture became the platform for the years that followed — the Apple S10 and the 2025 lineup all run it.