Just read through all the threads here in the Overclock section, read through your manual and the try it out on your system. That's what I do and it helps!
[img width=777 height=600]http://i1301.photobucket.com/albums/ag110/dougfitz/48_zps2768e6b0.png[...
[img width=777 height=600]http://i1301.photobucket.com/albums/ag110/dougfitz/48_zps2768e6b0.png[...