Apple S9

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<div style="font: bold 2em/1.2 -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Helvetica, Arial, sans-serif; color: var(--wiki-color);">Apple S9</div>
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! class="ios-lab" | Designer
| class="ios-val" | [[Apple]]
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! class="ios-lab" | Introduced
| class="ios-val" | September 2023 (Apple Watch Series 9, Ultra 2)
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! class="ios-lab" | Type
| class="ios-val" | System in Package (SiP) — 5.6 billion transistors
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! class="ios-lab" | CPU
| class="ios-val" | Dual-core, 64-bit — [[Apple A16|A16]]-generation performance cores, ~30% faster
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! class="ios-lab" | Neural Engine
| class="ios-val" | 4-core (first in Apple Watch) — 2× faster machine learning
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! class="ios-lab" | Wireless
| class="ios-val" | [[Apple U2|2nd-generation UWB]]
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! class="ios-lab" | Devices
| class="ios-val" | Apple Watch Series 9 · Apple Watch Ultra 2
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! class="ios-lab" | Predecessor
| class="ios-val" | [[Apple S8]]
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! class="ios-lab" | Successor
| class="ios-val" | [[Apple S10]]
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{{Apple silicon Navbox}}

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.

= 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.

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