Expansion cards allow you to add special features to a system or increase a computer's multimedia performance. Video cards previously used AGP technology, a less-powerful interface standard for expansion cards, but high-end graphics adaptors now use PCI Express.
High-powered video cards require a six-pin peripheral power cable to supply power to the video card, as the motherboard can't supply enough voltage to the PCI Express slot on its own. Older power supplies don't have a six-pin PCI Express power adaptor, but you can use a Molex to PCI Express adaptor to add one to the PSU.
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Purchase a four-pin peripheral power cable (or 12V four-pin Molex) to 12V six-pin PCI Express adaptor.
Turn off the computer and disconnect the power cable from the back of the case. Remove any other devices connected to the computer.
Press the power button to drain the circuit board of any residual electricity. Unscrew or pop off the case to the computer.
Touch the chassis to prevent damaging the computer with static electricity. Electrostatic discharge can permanently and irreversibly damage the devices in the system.
Locate two available four-pin peripheral power cables coming from the power supply. Remove the adaptor from its protective packaging.
Connect the four-pin cables on the adaptor to the four-pin cables in the computer.
Insert the other end of the adaptor -- the 12V six-pin PCI Express cable -- into the six-pin interface on the rear of the video card.
Close the case to the computer and reconnect the power cable and any other devices.
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