Quoted from the technical product specification (TPS) of this motherboard "this connector provides the required additional power when using high power (75 W or greater) add-in cards in either or both the PCI Express x16 and the PCI Express x8 bus add-in card connectors." page 46 http://downloadmirror.intel.com/18132/eng/DP55WG_ProductGuide02_English.pdf
If your video card feeds itself directly from the power supply, the aux power connector for the pci expresss slots is not required.
Thank you Diego!
You are welcome \m/