It means SLI isnt working. What motherboard are you using? IS the SLI bridge installed? In the Nvidia control panel do you have maximize 3D performance selected? Under SLI configuration it should say 2-way SLI enabled.
Yes It is on the maximize 3D performance on Nvidia already, the SLI bridge is on top of the 2 cards, and on the map of the nvidia control panel it has green SLI mark that points to gtx 680(1) and gtx 680(2)