New mac pro only showing 24hz via 4k, not 60hz?

Discussion in 'Mac Pro' started by kjhman, Oct 21, 2016.

  1. kjhman macrumors newbie

    Joined:
    Jun 14, 2009
    #1
    Hi there everyone. I'm trying to get to the bottom of this problem. I know that my current setup will support 4k @ 60hz but currently (according to 'about this mac') my 2016 LG 4k OLED tv is only running at 24hz @ 4k resolution. I mainly purchased this mac pro (2013 model, 64gb ram, d700 video card) because of the 4k @ 60hz support. I am coming from a mac mini that ran @ 60hz via 1080p and the difference in smoothness is extremely noticeable.



    I can't seem to find a way to change the refresh rate in the settings. Can someone help me out here? The help would be extremely welcomed!



    I'm currently running macOS Sierra 10.12



    Keith
     
  2. Phil A. Moderator

    Phil A.

    Staff Member

    Joined:
    Apr 2, 2006
    Location:
    Shropshire, UK
    #2
    Are you connecting via HDMI? If so, that's the only refresh rate supported: to get 60hz you need to connect to a monitor that supports DisplayPort and connect via one of the DisplayPort / thunderbolt sockets

    Have a look here for more information. https://support.apple.com/en-gb/HT206587
     
  3. kjhman thread starter macrumors newbie

    Joined:
    Jun 14, 2009
    #3
    Yeah i am connecting via HDMI... Is there any way to connect this LG OLED tv to get 60hz? maybe an adapter?
    --- Post Merged, Oct 21, 2016 ---
    i guess i'm confused because it says the following:

    With OS X Yosemite v10.10.3 and later, most single-stream 4K (3840x2160) displays are supported at 60Hz operation on the following Mac computers:

    • MacBook Pro (Retina, 13-inch, Early 2015)
    • MacBook Pro (Retina, 15-inch, Mid 2014)
    • Mac Pro (Late 2013)
    • iMac (27-inch, Late 2013) and later
    • MacBook Air (Early 2015)
    With OS X Yosemite v10.10.3 and later, most single-stream 4K (4096x2160) displays are supported at 60Hz operation on the following Mac computers:

    • Mac Pro (Late 2013)
    • iMac (Retina 5K, 27-inch, Late 2014)
    --- Post Merged, Oct 21, 2016 ---
    How about these minidisplay port to hdmi adapters?
     
  4. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4
    The nMP can display 4K 60Hz only via the dp (thunderbolt port). It support 4K 60Hz doesn't mean that can be displayed via any port (e.g. HDMI).

    However, I guess your TV only has HDMI input. So, an adaptor is a MUST in your case.

    Also, from memory, you need an active adaptor to make it work.

    Without adaptor, the Mac may detect your TV's max resolution as 4096x2160 (even though the actual resolution is 3840x2160, but your TV may able to accept 4096x2160 signal), and only 24Hz avail via HDMI 1.4 under this resolution.
     
  5. kjhman thread starter macrumors newbie

    Joined:
    Jun 14, 2009
    #5
    I appreciate your help. I just ordered a few minidisplay port to HDMI adapters from amazon so hopefully that works to solve my problem. I'm assuming thats what youre getting at with your last message.

    thanks!
     
  6. Fl0r!an macrumors 6502a

    Joined:
    Aug 14, 2007
    #6
    You'll need an active DP1.2 to HDMI 2.0 adapter. All other adapters won't work.
     
  7. kjhman thread starter macrumors newbie

    Joined:
    Jun 14, 2009
    #8
    Aesome. thanks so much for the help. cant wait to try out that adapter. I just ordered it!
     
  8. rawweb macrumors 6502a

    rawweb

    Joined:
    Aug 7, 2015
    #9

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