I have a Probook 4520s and it overheats so I can't use more than 50% of my CPU and I know it is because of its water resistant design which doesn't leave much air vents. I'd like to ask if it is possible to change my graphics card (Radeon Mobility 5470) with another one preferably an NVidia card which doesn't use the CPU as much as ATI. If you need more information about anything don't hesitate to ask.