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Apple S4
This is r2 (the current revision), saved by jack. Full history
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Apple S4
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| Designer | Apple |
|---|---|
| Introduced | September 2018 (Apple Watch Series 4) |
| Type | System in Package (SiP) |
| CPU | Dual-core, 64-bit (first in Apple Watch) — ~2× faster than S3 |
| Wireless | W3 wireless chip |
| Devices | Apple Watch Series 4 |
| Predecessor | Apple S3 |
| Successor | Apple S5 |
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The Apple S4 brought the Watch into the 64-bit era in September 2018, doubling performance with custom Apple cores. Its bigger story was sensing: a next-generation accelerometer and gyroscope enabled fall detection, and electrodes in the crown and back supported the Series 4's ECG app — the feature that turned the Apple Watch into a regulated health device.
1 Legacy✎
The S4 generation is where the Watch's health pivot happened in silicon — ECG, fall detection, and the 64-bit foundation that watchOS still requires. Its core design carried nearly unchanged through the S5, setting up the S series' pattern of sensor-led rather than speed-led years.
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