on The dell insperon you have the option of popping out the graphics chip and replacing this. They did this so that after taking a persons money by selling him a laptop with a Radeon7500 chip, they can take more money from him when the 9000 chip came out. They also give you the option of a GeForce4GO, but i duno why anyone in their right mind would take that option.
Hope that helps,
--Art