ThrottleStop

ThrottleStop is a Windows-based software utility designed to monitor and manage processor throttling on Intel CPUs. It provides real-time data on core frequencies, temperatures, voltages, and power usage, while offering controls to modify how the CPU throttles during operation. The program is widely used by enthusiasts and has been employed to improve performance, reduce temperatures, and lower fan noise by adjusting voltage, frequency, and power limits.

Historically, ThrottleStop emerged in the early 2010s as a lightweight tool for laptop users facing thermal throttling. It gained popularity as a means to undervolt processors and tune Turbo Boost behavior, enabling more consistent performance without excessive cooling requirements. Over time, it evolved to include expanded monitoring and tuning options for a range of Intel mobile and desktop CPUs.

Key features commonly associated with ThrottleStop include voltage offset adjustments (undervolting) for CPU cores, the ability to modify multiplier/frequency settings, and control over power-limit parameters such as PL1 ( sustained power) and PL2 (short-term power) along with tau. It also offers Turbo Boost enabling/disabling, historical log capture, and profile-based configurations that can be triggered via hotkeys. The software typically requires administrator privileges and operates by adjusting MSR (model-specific register) settings rather than making BIOS changes. Support and functionality can vary by CPU generation and system firmware.

Caveats include the risk of system instability or crashes if voltages and power limits are set improperly. ThrottleStop is not officially supported by Intel, and misuse can affect warranty coverage or OEM power-management features.