Whatever benefit you may get from a slight reduction in thermal output & energy consumption is going to be offset by the drop in performance.
Are you sure you're having heat issues, though? What temps are you currently getting at idle/on youtube/during gaming? At stock speeds, the stock cooler should easily keep you under 40C when idle, & 50-60C during gaming (those are the temps my FX-8320 gets, even in newer games like BF4).
If you're running a little hot, have you checked the airflow in your case, & do you have at least 2 case fans (front "pull", rear "push")? If not, at least make sure you have 2 case fans...& if your case can handle them, consider putting in as many case fans as your case will handle.