Worrying question regarding speedstep on 2500k setup

[Cadno]

I have just overclocked my setup to 4000 but now in core temp and CPU-z the
Frequency is changing from 1600 to 4000 and back again over and over. I only have some Internet windows open and Origin downloading the BF3 update.

Is this normal? I have not noticed it before and am a little worried that it could be causing damgage with the flicking between 1600 and 4000 over and over

 

[Cadno]

Yeah I know its normal but there is little load on the system. Before I did the OC there would be no change unless I opened a game or somthing now its just a couple of Internet windows and Origin updating and its fluctuating every few seconds and that is what has me a little worried

 

[Cadno]

Anyone who may have just got home from work have any ideas on this?