dont worry about cpu/z says yuor cpu is automatically downclocked when its not being stressed
nobody here can tell yuo how to overclock your cpu , no one will want to accept responsibility for you screwing something up , its a bit rubbish i know but thats how it is , overclocking is a fantastic way of getting your system to run faster for free , and trust me on this with the right coolin (DONT try to oc your cpu on stock cooling) and the right knowlage that cpu you have there will fly , trust me ive had my grubby overclocking hands on a friend of mines pc with one
you need to research and learn properly how to overclock , dont jump in take your time mate , trust me its all worth it in the end thetr are plenty of forums that can help with specifis questions , for starters read this
http://forums.guru3d.com/showthread.php?t=227317
hope this helps a little , you'll be a pro before you know it , BE CAREFULL