I have an old PC I'm working on. I need to upgrade the graphics card so I'm told for windows media center to run right. I'm wondering is it worth it to buy an AGP graphics card cUse thats all the board will take or upgrade the motherboard to something newer that I can harvest my old components from and add to the new board to save money? Why do I need to upgrade the card? What is that going to do for the computer and what will more memory on a graphics cars do?