Laptop cpu clock being weird ?


Dec 19, 2014
In task manager my laptop reads my cpu clock at 3ghz but when I open Properties through my computer ('This PC' ) it says its at 2.2ghz why is this happening ? the sales person showed me the task manger and said its at 3 Ghz , was I tricked? I check both on the same power option(high performance )
some info on my laptop
i7 4702MQ @ 2.2ghz<--- according to properties 3.02ghz<--- according to task manager
8 gigs ram
Geforce 740m 2 gigs
windows 8.1 64 bit
I have not changed any settings what so ever . Can anyone explain this ?