A tutorial on undervolting. http://www.notebookforums.com/showth...t=undervolting
I've used "Centrino Hardware Control" to undervolt my Vaio S360. Now the CPU runs much cooler, and the fan hardly comes on any more.
With Centrino Hardware Control you can easily control the hardware components of your Intel Mobile Notebook. Centrino Hardware Control helps you to:
-prolong the battery lifetime and cool down the system with CPU Voltage Control and ATI Clock Control.
-full processor speed control with custom dynamic switching and CPU Speed Control (CPU policy)
-monitor the battery charge level and system temperature.
-control and monitor the Hard Drive with S.M.A.R.T management, acoustic & advanced power management and Hard Drive temperature monitoring.
-reduce noise with Notebook FAN Control.