The internal parts of our computers, including the Hard disk drives, the floppy disk drive, the CD-rom drive, and even the motherboard, are all being driven by a power supply unit. This power supply unit has a designated cable that is alloted for the internal parts mentioned. In certain cases though, cables with two different types of connectors on both ends must be utilized to be able to feed them power from the supply. Discount Computer Parts Center's VGA chip power cable for instance helps you convert two 5 1/4" cables to one VGA power cable for your video cards.