AthlonXP Underclocking for a Low-Power Fix @ Toms Hardware Guide

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It's a lot easier than you think. A few simple tweaks can transform an AthlonXP with the right motherboard into a mobile version that throttles down to a clock speed of 300 MHz for a range of applications that do not need 1 GHz and more horsepower. We also detail why our power-consumption reducing hacks do not apply to the Pentium 4.