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the frequency that is displayed in cpu-z is the frequency at which the cpu is run right on the moment you open it. it wont go full frequency until it need to like playing or opening demanding apps.
at time you can see this when you record 4k and open asap cpu-z it will show the a57's are running at 2ghz.
you cannot modify cpu speed unless you are rooted. snapdragon 810 has been reported to be overheating and the solution for that is called thermal throttling, if you modify this , there is high chance that your device will go note 7 in your hand. (burn, burst in to flames, explode)