intel-undervolt is a tool for undervolting and throttling limits alteration for Intel CPUs.

Undervolting works on Haswell and newer CPUs and based on the content of this article.

This tool may damage your hardware since it uses reverse engineered methods of MSR usage. Use it on your own risk.

Run make && make install to build and install intel-undervolt to your system. Run systemctl daemon-reload to reload unit files.

You can configure parameters in /etc/intel-undervolt.conf file.

By default it contains all voltage domains like in ThrottleStop utility for Windows.

The following syntax is used in the file: undervolt ${index} ${display_name} ${undervolt_value}. For example, you can write undervolt 2 'CPU Cache' -25.84 to undervolt CPU cache by 25.84 mV.

power package ${short_term} ${long_term} can be used to alter short term and long term package power limits. For example, power package 35 25.

You can also specify a time window for each limit in seconds. For instance, power package 35/5 25/60 for 5 seconds and 60 seconds respectively.

tjoffset ${temperature_offset} can be used to alter temperature limit. This value is subtracted from max temperature level. For example, tjoffset -20. If max temperature is equal to 100°C, the resulting limit will be set to 100 - 20 = 80°C. Note that offsets higher than 15°C are allowed only on Skylake and newer.

Run intel-undervolt read to read current values and intel-undervolt apply to apply configured values. You can apply your configuration automatically enabling intel-undervolt.service.

intel_rapl module is required to measure the power consumption. Run intel-undervolt measure to display power consumption in interactive mode.

Sometimes power and temperature limits could be reset by EC, BIOS, or something else. This behavior can be suppressed applying limits periodically. intel-undervolt-loop.service allows you to run the program in daemon mode which will apply limits with the specified interval. You can change the interval using interval ${interval_in_milliseconds} configuration paremeter.