GTX680 dual monitor problem

Discussion in 'Mac Pro' started by phybron, Mar 11, 2015.

  1. phybron macrumors newbie

    Jan 29, 2014
    I just added a Dell U2412M to my existing U2410. Both work fine from the lower DVI-I port, but neither work from the DVI-D port above. I can't find what I'm missing.

    I'm running 10.10.2 and have tried both OSX and Nvidia drivers.
  2. MacVidCards Suspended

    Nov 17, 2008
    Hollywood, CA
    You should post in the GTX680 4GB thread as that is obviously what you have.
  3. phybron thread starter macrumors newbie

    Jan 29, 2014
    Thanks. I see it's a 4GB problem and I see no sign of a solution other than the one you guys have figured out. I didn't buy the card from you though, so no help there. I'll just get a DisplayPort cable I guess.
  4. hfg macrumors 68040


    Dec 1, 2006
    Cedar Rapids, IA. USA
    I have the same problem with my GTX680 4GB card ... the upper DVI-D port does not function. I sent mine back to MacVidCards for a firmware update, but they were unable to fix it. I ended up using the Display Port to drive my second monitor for now, but am unable to add a 3rd monitor at this time.

    Please post if you find a solution to this problem ...

  5. phybron thread starter macrumors newbie

    Jan 29, 2014
    Well I can't find a modified ROM which addresses this issue, so buying a DisplayPort cable is a cheaper solution than sending it to MacVidCards for flashing. I think I'll have to just do that, which doesn't help you: I'm only trying to run two displays, not three.

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4 March 11, 2015