For GPU overclocking you want: ATI Overdrive (recommended), ATI Clock Tool or Afterburner also work from what I have used in the past. ATI overdrive accessed through the CCC facility has a clever facility to check for artifacts and makes sure that clock is stable enough to prevent them and then you can stress test it using
Furmark and if it does not lock up/glitch/artifact after around 5-10 minutes you should be ok using those clocks. Overclocking is also dependent on the software as well some programs/games can still crash or cause the display driver to crash when overclocking.
I use 800/1100 but can handle 840/1135. Good to test and find what is stable and works best for you. Above 825/1100 I notice flickering in some games so I stick with what I have apart from when benchmarking.
For the CPU overclocking you want
SETFSB and if you have the 740QM you might be able to get away with the free settings
here otherwise it might be an idea to pay the donation and get the JH settings for the 720QM like I did its only $8-$10 I believe now. With this you can simply raise the PLL and test every couple of mhz by using something like
Prime 95 to make sure it does not lock up or BSOD.
Also have a read through
this and apply this fix if you plan to o/c the CPU as Windows 7 has an adverse effect which needs correcting with a simple timing fix applied through DOS prompt using administrator settings.
Both overclocks are limited by voltage and thanks to Asus it would appear because of hardwiring these cannot be changed so as long as you have good temps at the moment or good paste you wont really need to worry about the small increase in temperature, but use
HWINFO to make sure everything is running as it should by using the sensors. Also every chip is different so do not expect to reach what others have or expect to reach more, as Tijo has explained on another recent overclocking post that chips are put through certain tests to make sure they can handle the stock clocks, voltage, watts, etc and if they pass the tests they are allowed into the OEM production world, they do not necessarily test for the chip to reach the sort of output we aim for which in my case is excessive and im nearing the point of attaching a car battery to the GPU/CPU
As always overclock at your own risk.