Restart your PC and press Del , F2 , or F10 (common keys) during boot to enter BIOS/UEFI.

If your overclock was so unstable that the PC won't boot into Windows (or even into BIOS), you can perform a hardware reset. Clearing the CMOS (Complementary Metal-Oxide-Semiconductor) resets to factory defaults, disabling every overclock instantly.

RAM overclocking is unique because it is often necessary to achieve advertised speeds. A DDR4-3600 kit runs at 2133MHz or 2400MHz by default. Enabling (Intel), DOCP (AMD for DDR4), or EXPO (AMD for DDR5) is technically overclocking.