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Currently I use core i5 system 2320 @ 3.0GHz with x86-64 bit architecture using Ubuntu 12.04. I intend to buy a Graphics Card which supports to work on multiple monitors for multiple workspaces. Any suggestions which graphics card to buy and how to configure my system for this? I have already installed Compiz on my system.

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Did you try some 3D software with your xinerama setup ?

from Xinerama article on Wikipedia :

In some[which?] implementations, OpenGL (3D) direct-rendering only works on one of the screens. Windows that should show 3D graphics on other screens tend to just appear black. This is most commonly seen with 3D screen savers, which show on one of the screens and black on the others. The Solaris SPARC OpenGL implementation, ATI Proprietary Linux driver and nVidia Proprietary Linux driver all support hardware accelerated rendering to all screens in Xinerama mode.

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No I haven't tried to install any 3d software, is there any way to make changes in the system to achieve this without installing any external software? Thanks Aurelien –  Srijan Jun 28 '12 at 10:08
    
in the mesa-utils package you have tiny 3D demos, like glxgears. You can try "glxgears -info" to display openGL info. Its a really small package, it may already be installed due to dependencies. Then it should display gears on at least one of you xinerama screen. –  Arcadien Jun 28 '12 at 10:14
    
Can You intensify your point based on the question, please? –  Srijan Jun 28 '12 at 14:14
    
@Srijan I'm not sure to understand your comment –  Arcadien Jun 28 '12 at 14:16
    
As of now I don't have neither multiple monitors or a graphics card installed on my system, going to buy it in a day or two. So just wanted to make sure that I can setup my environment so as to work as desired. I checked the Xinerama which worked fine with my office system. glxgears -info just works fine. I just want to allocate different workspaces for each monitor. –  Srijan Jun 28 '12 at 14:32

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