Some other tools you may need while overclocking
http://www.alcpu.com/CoreTemp/
This tool is good for monitoring you CPU temps, and it also has a G15 function so that you are able to watch temps while you are in game.
http://files.extremeoverclocking.com/file.php?f=205
Now while you have you Core temp running stress you overclock to see if it is stable or not, there should be no errors while you are doing this MIN run time an hour.
http://downloads.guru3d.com/IntelBurnTest-v2.3-download-2047.html
Once you have found the sweet spot with you overclock, run burn test to see if it meets Intels standard
Note might only work on INTEL CPUS have not tried it my self.
If any one has something constructive to add, Plz do it will be greatly appreciated.