@patio - I didn't actually post a link to the information from Intel. Instead, I went to the page and snipped the relevant information and attached it to my post. The link I provided was to a program which can reveal the type and build revision of the processor in your system so that you can compare it.
For the sake of completeness, here are the links from Intel:
You manually set your voltages when you overclocked yes? you didnt leave it on automatic did you? What voltage and clock are you running? and have you disabled intel speed step and / or C1E? (all this can seriously affect your idle temps)
That said dont worry too much about your idle temps (unless of course they are ridiculously high ) , its your full load temps you need to worry about.