ThrottleStop

Tuesday
ThrottleStop is a small application designed to monitor for and correct the 3 main types of CPU throttling that are being used on many laptop computers.
  
For each throttling type, you can adjust several options. 'Clock Modulation' and its variant, 'Chipset Clock Modulation' allow you to slow down your CPU or make it run at 100% of its designed capability.

Also, you can set the multiplier value for your processor. For example, reducing this value results in a CPU lower speed; this can reduce power usage when the laptop is running on battery. Furthermore, if your processor is Core 2 based, you are able to adjust its VID or voltage values. 

With ThrottleStop, you can disable the turbo boost feature of your CPU, as well as protect your computer from overheating using the 'BD PROCHOT' option.