I have been scouring the internet looking for answers and have not found one. I have two cards, GT 520 and Geforce 210 in a Linux Mint box. I have the HDMI to the monitor and VGA to a projector on the main graphics card. I can get that set fine using Twinview with a desktop on each (extended). When I enable the other graphics card using separate x it has the first graphics card spanning/extending one desktop from the monitor to the projector which obviously won't work for me. I need the two individual desktops (extended) on the first card described for PowerPoint presentation on the extended desktop. I am using the 3.10 beta driver. I have tried the non-beta driver also. The second card is also hooked up VGA to another single projector and desktop and all I need is a browser open on it. Is there an answer to this puzzle? I have tried the nouveau driver and it does not recognize the second card. This is using KDE.