Asus p5ql - pro and Intel q6600 question?

Hello. I recently bought a asus p5ql - pro motherboard and a Intel q6600 quad core processor. I've overclocked it at 3.02 ghz.(fsb at 335, pcie freq at 100 and cpu voltage at 1.45). And when I open Asus AI suite or cpuz I can see the cpu's frequency oscillating. I mean for 5-9 seconds it shows 3019 mhz and then it changes to 2019 mhz. Why? What should I do to make it go at 3019 mhz only?