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The Raspberry Pi 5 can't be overclocked past 3 GHz. Why? The secret is hidden in the silicon deep inside.

X-rays don't go deep enough. This video explores modern CPU architecture, clocks and PLLs (Phase-Locked Loops), silicon die shots, and even transistor-level debugging with an electron microscope!

Mentioned in this video:

- Blog post with more images: https://www.jeffgeerling.com/blog/202...
- Open Circuits book: https://amzn.to/3uZRJow
- Kleindiek Nanotechnik: https://www.nanotechnik.com/copyright...
- John McMaster (Twitter):   / johndmcmaster  
- Siliconpr0n die shot - RP1: https://siliconpr0n.org/map/raspberry...
- Siliconpr0n die shot - BCM2712: https://siliconpr0n.org/map/broadcom/...
- der8auer's video on 7nm analysis:    • Unreal Precision - Analyzing a Single...  
- Water cooling block for Pi 5: https://www.jeffgeerling.com/blog/202...
- EDATEC's passive heatsink for Pi 5: https://www.edatec.cn/en/ac/pi5-openc...
- Apple II Pendulum Clock: https://github.com/wkjagt/apple2_pend...
- 32nd note drummer:    • 110 120 Bpm 16th Note Roll 32nd Note ...  
- Monster vs Dave Grohl drum battle:    • Dave Grohl and Animal Drum Battle - T...  

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Sponsor me on GitHub: https://github.com/sponsors/geerlingguy
Merch: https://redshirtjeff.com
2nd Channel:    / geerlingengineering  

Contents:

00:00 - Human DNA on my chip?
00:42 - Overclocking, featuring actual clocks
05:59 - Heat is not an issue (unless you're a candle)
07:14 - Die shots: OCP on the Pi 5's BCM2712
11:51 - Die shots: RP1
12:37 - Probing individual transistors at 16nm
18:35 - Peering deeper inside silicon
20:06 - Learning more...