Well CPU-Z for me does this as well - I researched it and I believe it's because of a feature called Intel SpeedStep whereby on idle the clock speed is reduced to lower power consumption and/or produce less heat - I think that's what it is (correct me if wrong)
Here is where I found the info from - http://forums.hexus.net/showpost.php?p=1042452&postcount=4 - on dot point number 9.
SpeedStep on wiki - http://en.wikipedia.org/wiki/SpeedStep
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