GIGABYTE GA-X79-UP4

Hi, I am new to this and have limited knowledge. I upgraded my graphics card from a GTX 770 to an ASUS STRIX GTX 980 ti. I have connected the 2 6+2 connectors as it has 2 8 pin sockets and gotten 2 white LEDs stating they are connected correctly. When I boot up the system all fans, LEDs kick...