If there is no PCI-Express connector on your power supply you can use the MPE-50 cable to make your own PCI-Express connector. The Nexus MPE-50 makes from two 4-pin Molex connectors one PCI-Express connector.
Installation is easy, plug in the Molex connectors and you have your PCI-Express connector.
The MPE-50 is a Low-Cost solution for users not wanting to upgrade their power supply. Some power supply’s do not come with a PCI-Express connector, if you still want to use the possibilities of a PCI-Express graphics card, and don’t want to upgrade your power supply you can use this low cost solution.