If you have a video card installed via an MXM port you can change the video card. Though this does involve some serious dismantling of the laptop. Removing and reseating the heatsink/pipe/fan assembly.
Prior to removal, uninstall the old video drivers.
There are few different MXM specs, with different wattage ratings. You will want to make sure the wattages match (or are lower then the original card)