AMD Socket-A 133MHz FSB/DDR Overclocking Guide

If your motherboard doesn’t support voltage adjustment, you can use the same bridging technique at location L7 to change the voltage of your CPU. 

Remember that all of the current line of Athlon processors run at a 1.75v core voltage setting by default. Earlier chips may be spec'd to run at lower voltages, but all newer ones should be rated at 1.75v.

For Duron owners, all new Duron CPUs run at a default 1.60v, but if you plan on getting a Duron up to the higher clock speeds you'll want to probably bump the voltage up to at least the 1.75v level which, as we just mentioned, is the default for the newer Athlons.

Ideally you will have a motherboard that offers voltage adjustment either on the board or preferrably in the BIOS, keep a look out for upcoming motherboard reviews that feature these new DDR/266MHz FSB chipsets for the Athlon here on AnandTech, we'll make sure you know which ones give you the features you want and which ones fall short.