This power adapter cable is used in conjunction with PCI Express graphics cards. It allows two standard 4 pin molex plugs to connect into the 6 pin power socket on a PCI-E graphics card. Ideal for connecting high end graphics cards to a power source. The molex connections will also work with other optical drives that use this 6pin power connection. PCI Express graphics card power cable with two molex 4 pin connectors. Please note that there are two types of PCI-e 6 pin connectors, our connector has a square pin 5.