PHC is a patch with the purpose to downvolting capable processor. This is the most tweak to reduce power consumation in modern PCs, therefore it's very interesting, specially for laptop computers.
PHC support the two most common processor:
Mobile Centrino, Atom (N2xx), Core/Core2 (T and P - Series)
Installing the necessaire
Install phc-intel if you have an Intel processor else if you have an AMD cpu you must install phc-k8 version.
Because needed packages aren't in main repository, we must install from AUR. In this wiki i use the client yaourt.
Then, from the terminal type: (i assume that i'm using an Intel cpu)
sudo yaourt phc-intel
sudo yaourt phctool