Help with 4k display and Mac Pro

Discussion in 'Mac Pro' started by kalex, Jul 13, 2016.

  1. kalex macrumors 65816

    Joined:
    Oct 1, 2007
    #1
    I have a Early 2009 Mac Pro with GeForce GTX 680 video card.
    Just bought a UN48JS9000 Samsung 4k TV and can't get it to work at 60hz.

    Tried connecting it by itself, with another HDMI display and nothing helps.

    Any ideas? Should I install nvidia drivers? I'm out of ideas on what needs to be done

    Here is a screenshot of graphics property.

    [​IMG]

    I'm using Club3D Displayport 1.2 to HDMI 2.0 UHD adapter
    https://www.amazon.com/gp/product/B017BQ8I54

    OSX 10.11.5
     
  2. kalex thread starter macrumors 65816

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    Oct 1, 2007
    #3
    Yes thats my thread. That was more of choosing what to get. This is more of a direct problem that I'm facing now.
     
  3. CapnDavey macrumors 6502

    CapnDavey

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    Apr 11, 2015
    #4
    I get similar results same card 2 gig version seki 4k tv also 2009 mac pro
     
  4. nigelbb macrumors 6502a

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    Dec 22, 2012
    #5
    You have nothing to lose by downloading the Nvidia web drivers & trying them out.
     
  5. kalex thread starter macrumors 65816

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    Oct 1, 2007
    #6
    Is yours flashed or non flashed card?
     
  6. kalex thread starter macrumors 65816

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    Oct 1, 2007
    #7
  7. h9826790 macrumors 604

    h9826790

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    Apr 3, 2014
    Location:
    Hong Kong
    #8
    No experience on this. However, since the Connection Type shows DVI or HDMI. I doubt if the OS really allow you to display 4K 60Hz with this adaptor but without SwitchResX.
     
  8. kalex thread starter macrumors 65816

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    Oct 1, 2007
    #9
    I ordered another adapter just incase. Should I try SwitchResX?
     
  9. h9826790 macrumors 604

    h9826790

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    Apr 3, 2014
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    #10
    If your new adaptor will arrive within 10 days, then I think you can try it now (the free trial period is 10 days).
     
  10. MRU macrumors demi-god

    MRU

    Joined:
    Aug 23, 2005
    Location:
    Ireland
    #11
    Keep us posted. I'm trying to connect a HD7970 to 4k, I can get 24,25,30hz options but no 60hz but I know the TV can handle that.
     
  11. CapnDavey macrumors 6502

    CapnDavey

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    Apr 11, 2015
    #12
    Flashed I got it for 90 bucks at the hamfest then flashed it
     
  12. kalex thread starter macrumors 65816

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    Oct 1, 2007
    #13
    Flashed what?
     
  13. kalex thread starter macrumors 65816

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    Oct 1, 2007
    #15
    Just swapped out my gtxt680 for non flashed gtx 670. Same issue, Didn't fix it.
     
  14. kalex thread starter macrumors 65816

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    Oct 1, 2007
    #16
    Update - installed fresh copy of 10.11.5 no 60p, tried SwitchResX also didn't have that option in there. Looks like I'll be returning the TV and getting something else. Might even be looking at getting rid of mac pro as its getting up there in age (early 2009)
     
  15. MRU macrumors demi-god

    MRU

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    Aug 23, 2005
    Location:
    Ireland
    #17
    Yeah I can't get my 2009 MacPro or my late 2014 MacBook Pro Retina to see my LG 42UH750V at 60hz no matter what I try and likewise the MBP doesn't even seem to show right ration (things are a little stretched vertically on screen) and yet I know the TV supports 1:1 pixel mapping and chroma 4:4:4
     
  16. kalex thread starter macrumors 65816

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    Oct 1, 2007
    #18
    Yep I have no idea why. TV supports it, my friend is running it perfectly fine on skull canyon nuc at full 60hz. At this point I'm going to return my samsung and see what else i can get. I might even do what he did and go with skull canyon nuc and replace my mac pro. Its already getting there in age and nothing new from Apple is looking good to me
     
  17. CapnDavey macrumors 6502

    CapnDavey

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    Apr 11, 2015
    #19
    The GTX680 you ask hehe
     
  18. LogicalVue macrumors member

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    Aug 28, 2007
    Location:
    USA (Maine)
    #20
    It seems like the specs for the GTX680 say its HDMI can only support 4K at a max of 30Hz. And DVI certainly cannot do it. I run 4K using a GTX750ti using DisplayPort to a Samsung U28E590.
     
  19. kalex thread starter macrumors 65816

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    #21
    Thats correct but I was using display port via hdmi 2.0 adapter
     
  20. nigelbb macrumors 6502a

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    Dec 22, 2012
    #22
    As we know that the GTX680 delivers 4K@60Hz via DP 1.2 then the problem must be the adapter not working correctly (perhaps with that specific monitor).
     
  21. kalex thread starter macrumors 65816

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    Oct 1, 2007
    #23

    something wasn't working. I tried 2 adapters and 2 video cards. Friend of mine tried it with his nuc and it worked perfectly over hdmi 2.0 port without adapters running windows 10.
     
  22. h9826790 macrumors 604

    h9826790

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    Apr 3, 2014
    Location:
    Hong Kong
    #24
    May be you should ask your friend to test the adaptor via DP1.2. He has a working computer that can output 4K, a working HDMI 2.0 input 4K monitor, and I am sure his display card has DP as well.
     
  23. kalex thread starter macrumors 65816

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    Oct 1, 2007
    #25
    NUC doesn't have full display port connector. only mini and we don't have mini adapters.
     

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