Does a video card need dual-head (i.e. two D-SUB connectors) in order to hook up two D15 monitors? If yes, then how does this card: http://www.amazon.com/MSI-nVidia-GeForce-6200AX-S-VIDEO/dp/B0011U6502, which from the picture, has only ONE D15 connector, claim to support "Dual VGA." Is there actually a way to add a second one on?