An integrated (built onto the motherboard) card is not upgradable other than updated drivers. A stand alone video card, be it PCI or AGP (the extra slots on the motherboard) can be basic or major expensive. To change, two things need to happen.
1.) Go to the BIOS and disable the integrated card.
2.) Plug in the new card, plug the monitor cable into the card, and run the install CD.
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A friend of mine had some gateway, that is fairly new. It has the Intel Graphics Media Accelerator 950, he wants to upgrade the graphics card. I think what would happen is the integrated card stays there and the new one is installed. When you plug in a monitor it just goes to the new card not the old port. Right?