This is the most common method.
Step 1: Restart your PC and press Del, F2, or F10 (common keys) during boot to enter BIOS/UEFI.
Step 2: Look for one of these menus (varies by brand): how to disable overclocking
Step 3: Change the following settings to Auto or Disabled:
Step 4: Press F10 to Save & Exit.
Note: If you used Intel XTU or AMD Ryzen Master software, open that app and click "Reset" or "Default".
Overclocking often increases Vcore (CPU voltage) . Set the following to Auto: This is the most common method
Overclocking voids warranty, increases electromigration, reduces mean time between failures (MTBF), and—critically in regulated or secure environments—violates FIPS 140-3 operational environment constraints. Disabling overclocking ensures deterministic timing, prevents thermal covert channels, and maintains power budgeting. However, because overclocking capabilities are often fused into hardware at manufacture, "disabling" requires a combination of permanent fuses, locked registers, runtime monitoring, and OS policy enforcement.
Most consumer boards store OC settings as setup variables in EFI_GLOBAL_VARIABLE GUID. To disable permanently: Step 3: Change the following settings to Auto
Example for AMI BIOS: