When you need to install two video cards, it's likely because you are installing identical cards that use ATI's Crossfire or Nvidia's SLI. If your original video card is onboard and you're adding a Peripheral Component Interconnect Express (PCIe) video card, then you are really installing one card, not two. The key to get this working is to make sure the onboard card is fully disabled, preventing it from interfering with your new card.
Instructions
1. Insert the CD in the drive and wait for setup to begin. Follow the navigation prompts (usually just by clicking next and accepting default settings) until the driver installation is completed.
2. Disable the onboard drivers. This can be done in the device manager but is not recommended as it could reinstall itself at boot. Instead, restart the computer, load the BIOS (usually by pressing "F2" or "Delete" when prompted during startup) and locate the settings for your onboard adapter. You may need to consult the manufacturer for the details regarding your specific onboard settings.
3. Shut the computer down and open the side panel. You may need to unscrew approximately four screws first. Once inside, locate the appropriate slot for your PCIe card. If the card is an x1 card, the slot will be only 1 1/2 to 2 inches long. A 4x card will be twice as long, and an x16 card will be about three times as long. They can be any color, but most will be either white or yellow.
4. Plug the card into the slot until a faint snap is heard. Secure it with a screw (or two) in the metal mounting plate.
5. Plug the card into the slot until a faint snap is heard. Secure it with a screw (or two) in the metal mounting plate.
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