This is a replacement 8pin PCI-E 2.0 Connector housing , designed to be installed on your power supply leads as a replacement or alternative to the existing connector on the power supply. Or use it to make your own cable !
Complete the colour scheme in your case and dump those dull standard connectors !
*NOTE : This is not the same as the EPS 12v 8pin connector for use on motherboards. Please also be aware that if you are making your own lead that PCI-E 2.0 requires a higher power draw then original PCI-E connectors, so splicing a single 6pin PCI-E connection to an 8pin may cause damage to your system - make sure your power supply is capable of handling the load of a new generation card !