JG is wrong about the video card being integrated and soldered, but the idea of dedicating system memory to the video card is interesting and I have not thought about trying that on my ZT3000 since I could not find where you typically find the setting for notebooks with integrated video cards to changing the memory setting dedicated to the video card.
It is a seperate discrete circuit board, I know, as I have had to replace it.
That said these seperate video cards are usually unique to the model line thus not interchangeable with others.
Your notebook came with a ATI 7500 32MB, ATI 9200 32MB, and ATI 9200 64MB. As you all ready have the most advanced of these three options your only choice will be to UPGRADE THE NOTEBOOK to one with a better video card.
Dell seems to be the best for making notebooks with lots of interchangeable video cards and when you are on the ball can find what other models can be interchangeable but even then I would never buy a notebook thinking I could upgrade a video card.
PS, check out X1000forums.com, this line of notebook has a video card that fails prematurely at about ONE year and a couple months (just out of warranty period).