RaspberryPi 400 at 4x2.35GHz
Overclock your Pi400 to 2.35GHz CPU speed and 800 MHz GPU — and void warranty.
As soon as I’ve received my RaspberryPi 400 and reading about people running it up to 2 GHz, I decided to give it a go and see if I can get a stable, well-cooled system with a higher clock speed.
The “stock” Pi400 has the same BCM2711 SoC as the RaspberryPi 4, but in a newer revision, apparently with a more efficient design which gives less heat dissipation. In addition to this, the Pi400 has a big piece of aluminum over the whole bottom area of the keyboard, which is used as a heat sink.
Disclaimer
All the instructions here are to be done at your own risk. You will void your warranty by setting over_voltage.
Tuning
Warning again! This voids your warranty.
/boot/config.txt:
force_turbo=1
over_voltage=15
arm_freq=2350
gpu_freq=800
This gives you a GPU Frequency of 800MHz and a CPU Clock of 2.35GHz per core!
Verifying results
Conclusion
I’ve been running the Pi400 for 2–3 weeks at 2.35GHz. Everything seems stable and maximum temperatures while compiling a Linux kernel with “make -j4” resulted in temperatures around 50–60°C. Pretty neat!
