The one port is CPU 4 Pin for plugging into a modular power supply and another port is PCI-E 6 Pin for connnecting to video cards
PCI Express power splitter cable (4 pin to 6 pin) lets you connect two ports (standard) 4 pin PCI Express power connection provided by the computer power supply to two nVidia SLI or ATI CrossfireX video cards that require a 6-pin power connection
A cost-saving solution, this PCIE 4 pin to 6 pin power cable eliminates the expense of upgrading a computer power supply for the sake of compatibility with video card systems
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