Intel Turbo Boost Technology - Why the constant overclocking?

[Uncertainty]

Hi,
I'm against overclocking my CPU (core i5 750) coz I need it for so many years. Also I'm using the stock fan and my country is hot most of the year bla bla bla. I used to disable the Intel Turbo boost technology in the BIOS but nowadays, I thought of enabling it and enjoy the extra boost on high demand times only which sounds very attractive for me since I don't wanna overclock all the time (saving heat, processor, and energy).

My question is: Why I do notice that the PC is always overclocked (by checking cpu-z) even if I'm not doing anything (Idle state). For example, it's around 3100 MHz (Default is: 2600) even if I'm NOT doing anything at all on the PC. I'm surprised because I thought that the extra speed of the CPU is only when needed and not all the time.

[TheGlasMan]

Enable speed step in bios Also look in power settings (in display properties) to make sure you haven't disabled power management in windows as well.

Speed step will lower clocks and voltage at low usage.

[Uncertainty]

I got it. I got my power plans sets to maximum performance and in that mode, the least amount of cpu to be used is 100% so I edited this to make it 5%. Now everything is working the way it should be. Low consumption on normal usages and overclocking on the fly when needed. Great technology from Intel.