There are many kinds of i7 CPU models as follows:
http://en.wikipedia.org/wiki/List_of_Intel_Core_i7_microprocessors#Desktop_processors
Use the 'wmic' tool on the shell:
>wmic cpu get name Name Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz
Please note: In some relatively rare case you might see access restrictions to those value.