LG 27UD68-P and MacBook Pro Retina, 13-inch, Mid 2014

Discussion in 'Mac Accessories' started by spscott, Mar 19, 2018.

  1. spscott macrumors newbie

    Joined:
    Sep 29, 2009
    #1
    Hi all,

    I'm trying to figure out if I can power my new monitor 1920x1080 @ 60 Hz from my MacBook Pro Retina, 13-inch, Mid 2014... It's an LG 27UD68-P and I can't figure out from what I'm reading online if there is any way to get 60 Hz using this computer. I just bought the monitor and didn't think it would be a problem but using HDMI it appears to be as I am only getting 30 Hz. I'm a little out of my element here... I'm wondering if using a minidisplayport to DisplayPort adapter would allow me to run 60 Hz?

    Thanks for any help. Worried I bought the wrong monitor :(
     
  2. JTToft macrumors 68040

    Joined:
    Apr 27, 2010
    Location:
    Aarhus, Denmark
    #2
    1920x1080 at 60 Hz is supported on every MacBook Pro ever.

    But the monitor you mention is a 4K monitor, so I'm confused by the question. You can't do 4K 60 Hz on a Mid 2014 13" due to GPU limitations.

    See this article:
    https://support.apple.com/en-us/HT206587
     
  3. spscott thread starter macrumors newbie

    Joined:
    Sep 29, 2009
    #3
    Hey there, thank you so much for replying. So I think I’m misunderstanding what I’m trying to accomplish. Right now, through HDMI, I believe I’m running 1920x1080 @ 30 Hz but in the “HiDPI mode” using HDMI. The resolution I have selected is 1920x1080 but it looks as sharp as my retina on the native display. I’m wondering if, using DisplayPort to minidisplay, I could run 1920x1080 @60hz in HiDPI to avoid the choppiness of the 30Hz.
     
  4. JTToft macrumors 68040

    Joined:
    Apr 27, 2010
    Location:
    Aarhus, Denmark
    #4
    - I suspected that's what you meant. You are actually running 3840 x 2160, but it looks like 1920x1080 due to Apple's "Retina" pixel doubling, which is what makes it look sharp. It should say "looks like" in your System Preferences, too.

    A Mid 2014 13" cannot do 4K 60 Hz no matter the cabling. This is due to limitations of the GPU. Mid 2015 and later can.

    But for the future, try to use DisplayPort instead of HDMI. Even if your computer could do 60 Hz, it would not be able to through its HDMI port which maxes out at 30 Hz. So your intuition on that was correct - it just won't help as the internals of the machine itself are also limited to 30 Hz.
     
  5. spscott thread starter macrumors newbie

    Joined:
    Sep 29, 2009
    #5
    Just in case anybody in this situation stumbles on this thread: After a couple of very frustrating days I was able to get this machine outputting 52 Hz @ 1920x1080 HiDPI!

    Had to use the below patch and SwitchResX to make a custom resolution setting.

    I'm sure taxing the graphics card like this isn't ideal for longevity but 52 Hz is a world of difference from the 30 Hz.

    https://github.com/Floris497/mac-pixel-clock-patch-V2
     

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