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Originally Posted by Chevalier
does this slow down the computer in anyway? or have some other side effect?
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Nope, doesn't slow down the computer. The only side effect that you will encounter is when your setting it up for the first time. It's a trial-and-error process to figure out what the lowest limit you can set the voltage to. Once you set it too low, your computer has a safety feature that 'crashes' your computer and displays the 'blue screen of death'. This is when you will know the lowest voltage setting, and you just simply reboot your computer.
I was a bit scared when I first heard about this too, but it just sounds more complex and dangerous than it really is. I'm glad I undervolted my laptop because my computer now runs 20 degrees celsius cooler than even when I was using a cooling pad. You'll also notice that the fan in your laptop won't have to run as hard as it used to.