Use this procedure to add supplemental power to a single PCIe2 card (for example, Nvidia Quad FX3800).
Locate the 6–pin auxiliary power supply cable with the connector labeled To GFX Card or Splitter and release the cable from the cable retainer.
If the splitter cable is attached to the connector, remove and retain the splitter.
Connect the 6–pin power supply connector to the six pin connector on the PCIe2 card.
Secure the cable in the cable retainer.