Late 2013 15" rMBP, can't get 4K at 60Hz. P2715Q

Discussion in 'MacBook Pro' started by ip67, Oct 27, 2016.

  1. ip67 macrumors regular

    ip67

    Joined:
    Sep 8, 2016
    #1
    So it seems my late 2013 15" rMBP should be able to drive my P2715Q at 4K at 60Hz, but no matter what setting I fiddle with, I can only get it to be 30Hz. I use my Mac in clamshell mode.

    What am I missing? I'm using the supplied Dell mDP to DP cable and MST is set to Secondary in the monitor's settings menu.

    Thank you for your help.
     
  2. psymac macrumors 6502

    Joined:
    Jul 17, 2002
    #2

    Get Switchresx, I've gotten 52hz on this exact monitor with a 2013 13" mbp, works great and glorious retina screen. Google this and you will find the settings for Switchresx.
    --- Post Merged, Oct 28, 2016 ---
    Here is the link:

    https://kandrejevs.com/blog/read/50/More-than-30Hz-on-Your-133-Macbook-Pro-and-4K-monitor
    --- Post Merged, Oct 28, 2016 ---
    But install Switchresx first and see if you can select 4K, also be sure you upgrade to Sierra and you may not even need to do anything else.
     
  3. ip67 thread starter macrumors regular

    ip67

    Joined:
    Sep 8, 2016
    #3
    Thanks for replying. I already have Sierra, and am currently running 4K fine but at 30Hz. It seems as if other users didn't need to install any 3rd party tool to get native 60Hz on the 15" late 2013 rMBP. I have the 15" model with GT 750M card.
     
  4. Wallabe macrumors 6502a

    Joined:
    Mar 15, 2015
    #4
    I have this exact monitor. You need to set MST to Off, not Primary or Secondary.
     
  5. ip67 thread starter macrumors regular

    ip67

    Joined:
    Sep 8, 2016
    #5
    Tried this and the fans went to full speed on restart and the monitor didn't show a signal. Also, I thought the late 2013 15" rMBP can only use MST and not SST according to Apple documentation: https://support.apple.com/en-us/HT206587

    Apple says to use MST, which contradicts your advice, so now I'm confused. Regardless, their documentation says I should be able to get 4K at 60Hz with MST.

    Thank you in advance for the help!
     
  6. ip67 thread starter macrumors regular

    ip67

    Joined:
    Sep 8, 2016
    #6
    Solved by installing SwitchResX & rebooting a few times by setting MST to off and unplugging the monitor, I now have the option in macOS Sierra to change the refresh rate now to 60Hz; Have no idea why Sierra doesn't show the refresh rate by default for this monitor?

    [​IMG]


    Thanks again!
     

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