Cpu running lower GHZ

I need some help, i installed an amd 4170 4.2ghz processor into my computer, this was an upgrade from my 4100 3.6ghz one, booted up fine and then i had random restarts. I returned the bios back to its default and its booted up fine and yet to restart. My problem is though the processor is now running and 2800mhz on 124w. Whats happened!? How can i get the 4.2ghz i wanted.

All help is appreciated! Thanks
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More about cpu running lower ghz
  1. MB model? Memory kit model? PSU model?
  2. What are you reading that with? If CPU-Z, run some CPU demanding task and see if the speed comes back up. It might just be Cool and Quiet or C1E lowering the speed normally for power saving.
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