There are many kinds of i7 CPU models as follows:
http://en.wikipedia.org/wiki/List_of_Intel_Core_i7_microprocessors#Desktop_processors
Windows Key + R will open the run command
Type CMD
and press
Type wmic CPU get NAME
and enter
For me it gives :
Intel(R) Core(TM) i7 CPU **920** @ 2.67GHz
Where the 920 is what I think your looking for...
If its not, if you just type wmic CPU
and press enter it will give you all the information about the processor in a hard to read fashion...
But then you can type wmic CPU get (whatever entry interests you)
to get just that one.
Good Luck