Mac Pro video output question

Discussion in 'Mac Pro' started by packsherpah, Jan 13, 2011.

  1. packsherpah macrumors newbie

    Joined:
    Jul 19, 2010
    #1
    I own a 2010 Mac Pro with an ATI 5870 video card. I recently purchased a Dell u2711 monitor. As some of you may be aware, there is a problem connecting the Mac Pro with the ATI 5870 video card using a minidisplay to displayport cable. Apparently some cables result in no signal - like monoprice.

    This brings me to my question that I would love a detailed answer on....

    Is their any visual downside to just connecting my Mac Pro to the monitor using a DVI cable? Is the video quality the same if I just use DVI? In other words, what is the difference in video quality between DVI and Displayport? If the answer is there is no difference in quality, I will probably just use DVI connecton anway, because it will free up the displayport in on the monitor for me to connect my macbook pro, which I sometimes like to have connected to the monitor if I want to extend my desktop.
     
  2. Hellhammer Moderator

    Hellhammer

    Staff Member

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    Finland
    #2
    As long as you use dual-link DVI, there shouldn't be any difference.
     
  3. initialsBB macrumors 6502a

    Joined:
    Oct 18, 2010
    #3
    Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)

    Why is that ? Because of resolution ?
     
  4. Hellhammer Moderator

    Hellhammer

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    #4
    Yes. Single-link DVI can only provide up to 1920x1200 while OP's monitor has native resolution of 2560x1440
     
  5. packsherpah thread starter macrumors newbie

    Joined:
    Jul 19, 2010
    #5
    Thanks Hellhammer for such a quick response. Am I right in assuming the DVI out on my ATI 5870 is dual link, and that the DVI cable that comes with the U2711 monitor is Dual Link too? How can I tell. I will point out that when I am connected via DVI using the cable that came with the monitor I do get native 2560x1140 resolution - so does that mean its working as intended?

    Thanks
     
  6. Hellhammer Moderator

    Hellhammer

    Staff Member

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #6
    ATI 5870 has dual-link DVI. It's likely that the monitor came with dual-link DVI as well.

    [​IMG]

    If you're getting 2560x1440, then it indeed is dual-link DVI
     

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