I currently have 3 monitors. When I go to Nvidia Control Panel. And Click on Span displays with surround. Whatever monitor I have plugged into the HDMI port will not let me span across that display.
I am running 2 GTX660 SLI with Iiyama E2773HDS plugged into DVI, Iiyama E2773HD plugged into DVI, Iiyama G2773HS Plugged into HDMI port.
Why not plug the 3rd one into the DVI slot of the 2nd card? This is an Nvidia setup, they let you do that.