dual monitors on dual video cards Ubuntu

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http://unix.stackexchange.com – I have been trying this to no avail. I am a linux newb, so a step by step explanation would be greatly appreciated. I have two video cards, nvidia geforce 8600 gt . I want a monitor to run on each card, so twinview cannot be used because my understanding that is only for single video cards. I went to the system monitors tab and my second display is detected but disabled. So I enabled it by clicking configure. It says switch to XScreen (requires restart of x server) and I set up my settings so that the new monitor is to the left of the main one. I apply the changes by updating the xorg.conf fi (HowTos)