Don't disable turbo?
Turbo is a mechanism that just elevates your core frequency up and down whenever more performance is needed.
An i5-3570 for example is clocked at 3.4 Ghz but can go up to 3.8 Ghz, when under heavy load. It's a compromise between great performance and lower power consumption.
Turbo comes with every non-k i5 or i7, it's perfectly normal.
Ok thank you for the post. I just read somewhere that i7 non k's where not supposed to be overclocked and i didnt realize that turbo was enabled by default on my motherboard.