Minor laptop cpu overclock

Here it is, I have a gx640 with the i5-450m processor. It is a bottleneck for my graphics card. I experience stuttor when playing starcraft 2, or Black Ops. My FPS were high so I was confused. Performance monitor shows both cores pegging out at 100 percent during game play. Its stock @ 2.40 ghz and I would like to try bumping it up to say 2.8 Just enough to leave some headroom to stop the stutter.

I ran prime at its stock specs and real temp showed the temp under full load at about 59 c. This was at an ambient room temp of around 78 F which is pretty much the temp my laptop will always be in give or take a few degree's.

I know the risks of Overclocking, and the importance of temps so I don't need to be reminded

My real question is since I can't over clock via my bios, which is the only way I know how to do, who can point me in the right direction for a software utility that will do what I need.

Like I said, just need a little bump to overcome this bottleneck, my only other option is a 300 dollar i7 upgrade that fits the laptops motherboard.