Abstract: Power supply systems and methods for their use in computer systems. The systems and methods make use of a power supply unit to which a main power cable and multiple cable stubs are electrically connected. The power cable is adapted to provide power to a motherboard of a computer system, and the multiple cable stubs are adapted to provide power to peripheral devices within the computer system. At least two of the cable stubs have different lengths. Each of the cable stubs has a device-specific female connector configured to mate with a specific class of the peripheral devices. The power supply system further includes at least one extension cable adapted to connect to the device-specific female connector of at least one of the cable stubs to allow extension of the cable stub or to power more than one of the peripheral devices.