when you go into the BIOS, the first or second menu should have the overclocking features, set it to manual. and the greyed out FSB (Front Side Bus, External Clock, it can have different labels) will become available. It is supposed to be set to 166MHz on your chip by default.
What is the RAM you have? I thought you have the A7V8X, which is a VIA board. On nF2 board you should be able to at least get 210MHz FSB, which might requiere you to lower multiplier. If your chip is locked then no modding will help, if its unlocked, you just lower it in the BIOS.
You will not need any modding to the chip.
Also something you should make sure is that you run your RAM in sync with the FSB, meaning the RAM Speed ratio should be 1:1 with the FSB, same speed. I'm not too sure how it looks/called in the BIOS of your board but it shouldn't be too hard to spot.