How can I change the CPU clock speed of my computer? It is a Dell Inspiron 5720 laptop, running Windows 8.1 Pro. In Linux, I know there are ways of doing this from the operating system itself, instead of having to go through the BIOS, like this and this. Is this possible in Windows?
I believe you can achieve lower frequencies from power options menu:
Setting maximum and minimum processor state to some percentage will probably fix the frequency on some level depending on your maximum CPU frequency.
However, this appears not to be under-clocking. A more detailed answer explains this in depth.