I agree with Tjj, but want to add that the reason I did it myself was almost solely to keep the heat lower, which in theory will prolong the life of the chip. Can I legitimately back up that claim? No, but I wasn't happy with having it at its stock speed and hitting close to 1.3V for no reason, so I overclocked my 3570k to 4.0GHz and undervolted a -.04 offset. Now it idles as low as 0.81V and 35C and at max load it hits 1.17V and stays at or under 70C, and seems way more stable than it did at 4.1 and 4.2 with less of an undervolt.
out if you haven't already, while I get back to you on the settings I changed. It was super easy, but please keep in mind every chip and system is different, and it can be very easy to fubar your stuff if you don't know what you're doing and go crazy in there.
Edit: Disclaimer: I am in no way responsible for anything bad happening to your system by doing the following!
In BIOS Advanced Mode (F7 for me), under Ai Tweaker go to Offset Mode, change sign to - and enter a figure for CPU Offset Voltage. I have this at 0.040 while overclocked to 4.0GHz (see above).
To achieve that light OC, I changed Ai Overclock Tuner from Auto to Manual, which changed the frequency from 103 to 100. Ratio Synchronization Control should be Enabled by default, and I chose 40 as the multiplier.
Pretty simple, but again, read up everything you can find to make yourself feel comfortable with it before pulling the trigger. I don't see any reason a -.040 offset won't work for stock if it works for 4.0. I think -.050 is still pretty conservative for keeping it stable, especially if you don't push it that hard. I guess a bad analogy would be like undervolting and pushing it too hard is like running a car out of gas, it'll stop but it won't blow the engine; whereas too much overclocking (and overvolting) will eventually blow the engine. I don't see any downsides to undervolting if you're keeping it stock.Edited by gauchotodd - 9/14/12 at 12:05am