dapww :
So basicly you are saying that if there is a performance need this intel speed step increases my CPU GHz up to its full potential (3,0 GHz)
Intel SpeedStep will slow down your CPU clock speed when it is not at high load. So when your computer is idle, and all you are running is CPU-Z, then it will probably slow it down to 2.2 or 2.4 because the computer does not currently need the clock speed to be very high. However when you boot up a high demanding application like a game, the clock speed will rise to it's full potential because the computer needs it to be faster. I usually disable SpeedStep to avoid this kind of confusion, as it is more of a power saving function.
You do not need SpeedStep for your CPU to run at full capacity. With it turned on, it will only run at full capacity when it needs to.