ASUS m/bs are about the easiest to OC available. Goto jumperfree configuration as Rbstr said, set AI over clocking or whatever it is, the section with standard, manual, 10%, 20%, 30% etc. to manual. Bam, you get a whole heap more settings which are hidden when OCing is set to auto or disabled (standard). Play with your FSB to increase your CPU speed. Find a source online that has someone sharing their experience with OCing the same CPU as you, often you can just get their settings, stress test and go.
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