Sacch,
There's only one laptop I know of that allows you to change the "vid card". It's an expensive laptop from alienware.
With most laptops your pretty much stuck with what's in it.
Maybe possible to send it back to manufacturer and have them change it, but is expensive and not worth it, because the vid chip and ram is soldered on the board.
Basically in a nutshell, on a laptop you can only expand the memory, yourself.
Good Luck