Don't mean to derail the conversation, but, -wha?!?!? That's amazing, I had no idea you could do that. How do you do that?
on Windows: http://superuser.com/questions/565347/how-does-windows-limit...
On Linux: https://wiki.archlinux.org/index.php/CPU_frequency_scaling
You can also play with the BIOS, according to https://en.wikipedia.org/wiki/Underclocking