This Raspberry Pi 4 overclock guide documents how to safely push the Pi 4B beyond its stock 1.5 GHz clock. With a few lines added to /boot/config.txt and decent cooling, you can push it noticeably …
overclocking
Raspberry 3B+ Overclock
Starting with the Raspberry Pi 3B, raspi-config no longer exposes overclock options in its menu. That does not mean overclocking is gone — it means you reach for a lower-level knob: /boot/config.txt. …