What motherboard and processor do you have? New processors (Aside from the AMD FX series) have locked multipliers - this makes it impossible to increase the multiplier above the set value. (You can, however, lower the multiplier) It is more typical to increase the FSB frequency in order to obtain an overclock. Using my Pentium 4 as an example - the multiplier is locked at 15 - with my FSB being 200MHz. 200MHz x 15 = 3000MHz. But I increased the FSB to 227MHz (227 x 15 = 3405). This is just one example of how overclocking is achieved in processors where the multiplier is locked.