Undervolt your Laptop!

Tick the ‘Use P-state transitions (PST)’ checkboxes under both the battery and AC power icons. This will allow you to manually choose which of the P-state settings to use for that profile. Tick the states you prefer, then ‘Apply’. You’ll have noticed that there is a gear icon in your system tray. By right-clicking this you can select which profile to use. Select ‘Performance on demand’ by right-clicking the icon, hovering over ‘Current profile’, then finally ‘Performance on demand’. By having this profile running, we can check for stability using its lower voltages.


There is also an option to ‘Enable profiles selection with left-click’, as shown above. This makes it a little easier.

Note: Before using an undervolted profile, ensure any critical files are closed. It may also pay to backup your system in case Windows decides to corrupt itself, although this is rare.

There are times when RMClock doesn’t work as expected, and voltages don’t actually change. To check this, run CPU-Z and briefly watch the voltage. If it hasn’t decreased from stock (and the multiplier matches the undervolted P-state), it may be that RMClock is not compatible with your hardware. Otherwise, check that you’ve entered and applied the settings properly.

Checking for stability
Much like overclocking, we must check for stability issues. In this case we’re using OCCT to stress test the CPU. Download, install, and run OCCT, and be graced by its glorious red facade. Select the ‘Custom (Infinite)’ and ‘CPU’ options from their respective dropdown lists.


Allow the test to run for 10 minutes. If OCCT or your PC doesn’t crash, then your PC is stable. You can now go back and lower the voltage again, then repeat the stability test. Follow this process until the laptop no longer maintains stability. Once a stable voltage is found, you can set all lower clock speed P-states to the same, or continue and manually lower their voltages independently. To be absolutely sure, you can run OCCT for several hours, as most enthusiasts prefer to do.

Now that the ‘Performance on demand’ profile is ready, go back and set the other two if required. Some people prefer to have SuperLFM on the separate ‘Power saving’ profile to reduce ‘transition lag’ between idle and performance speeds. The disadvantage of this is that you have to choose the profile manually.

So there you have it, a system which consumes less voltage, while giving you the power to manage performance! Just whack it into startup to enjoy the fruits of your labour at every boot.