Is this card compatible with my XPS 720? The card requires PCI Express 2.0 x16 and I see conflicting posts on whether this will work in the XPS 720. The card fits in my PCI slot and powers up (fans spin) but no output. The docs on power connector said "(2) 6-pin PCI-E connectors" (which I have) but the actual card had an 8-pin and a 6-pin connector. The card came supplied with a Y to connect 2 6-pins to an 8-pin. The card powers up with only this but I have no additional 6-pin source for the other connector. Is there a way to get power from other type connectors coming from the Power Supply?