What is the maximum gfx card can my Dimension 3000 hold up to.?

Hi, I've recently come across a Dell Dimension 3000. It is running a 3.0 p4 processor with 1g of ram. the downside to it at the moment for me is the onboard gfx card which is 96mb. I realize that I can only use PCI, and not AGP or PCI express.