By request, here is my undervolting tutorial.
Before we begin, download and install these 2 programs:
Notebook Hardware Control - http://www.pbus-167.com/
SuperPi - http://www.xtremesystems.com/pi/
-Step One-
Open NHC and go to the Voltage tab. Here you will find all the settings we will be changing today.
-Step Two-
Select "Use only Multiplier #1 and Voltage #1", this will disable your processors step-up so we can easily test.
-Step Three-
On the one available row, select the highest multiplier on the list (15, in my case).
Now it starts, take note this takes PATIENCE. On the voltage dropdown, select the voltage one spot below your default voltage. Then click Set. This will test the voltage for stability. If that completes successfully, move down one more and test again. If your PC becomes unstable, it will restart. When you start back up, select the voltage above the one that made you crash. This is your lowest voltage possible at your highest clock speed.
-Step Four-
Now that you've found your highest clock speed voltage, now it's time to find your lowest clock speed voltage. Repeat the instructions from Step Three. Once you find your lowest voltage for your lowest clock speed, uncheck "Use only Multiplier #1 and Voltage #1". Now make sure that at the top of list is your minimum clock speed voltage, and at the bottom is your maximum clock speed voltage. Now fill in the blanks. For starting from the top of list, fill in the blanks. For each step up in the multiplier, move the voltage 2 steps up in response. If your list goes from 10 to 12 for example, move the voltage 4 steps up. Use common sense for this step.
-Step Five-
Now for the final test. Open up SuperPi and tell it to calculate to 1 million digits. If the test completes, your voltages are high enough to ensure processor stability. If it fails, go back to NHC and tweak your voltages til' SuperPi completes successfully.
If all goes well, you should add about an hour of extra battery life and a lower operating temperature. Your lap rejoices. :D
NHC can also display stats about your PC (see first picture), feel free to configure it to your needs.
This completes this tutorial, hope I could help. :)
