three displays + mirroring only two?

Discussion in 'Mac Accessories' started by filmizus, May 23, 2007.

  1. filmizus macrumors newbie

    Oct 14, 2006
    I need to know if the following is possible with OS X (running on a Mac Pro):

    I currently have two dell displays running from the dual DVI card in my Mac Pro. I want to get a third display, which would require another video card. What I need to do is mirror two of the diplays and have the third display seperate, like so:

    Display A - Picture 1
    Display B - Picture 1 (mirrored from display A)
    Display C - Picture 2


  2. Angrist macrumors 6502

    Mar 11, 2005
    MI or NJ
    If you're just mirroring ... I THINK that you can get a splitter cable for the DVI. It'll just send the same signal to both monitors, and your computer will behave as if the two mirrored displays are a single display.

    Disclaimer: I haven't done this, or looked into it, this is just what I remember.\

    Edit: Google turned up this along with a whole bunch of expensive boxes. but this is what I had in mind.
  3. maccap macrumors newbie

    May 25, 2007
    I was trying to get this to work last night with the following setup:
    Mac Pro (two Nvidia Cards)
    2 - 23" Cinema Displays
    1 - 50" Plasma

    I wanted 1 CD to be mirrorred on the Plasma while the 2nd CD was an extension of the first CD. It was super late so I didn't have time to search last night but this morning I found this article on Apple's site, I believe this answers both our questions:

    You want to read the "Tip:" part at the bottom.

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