Enable 4k @ 60Hz on 2015 Macbook Pro 13"

Discussion in 'MacBook Pro' started by croco_dile, Sep 1, 2016.

  1. croco_dile macrumors regular

    Joined:
    Jun 3, 2016
    #1
    HI,

    I have a 2015 Macbook Pro 13" Retina, and a LG 27UD88 4k monitor.

    I tried to connect the laptop to the monitor using 2 methods:
    1. HDMI to HDMI cable, and the max I was able to get 4k @ 30hz
    2. Mini Display to HDMI cable, and the max I was able to get 1080p @ 60hz

    I know the laptop is capable of doing 4K @ 60hz. What am I doing wrong?
     
  2. wegster macrumors 6502

    Joined:
    Nov 1, 2006
  3. croco_dile thread starter macrumors regular

    Joined:
    Jun 3, 2016
    #3
    Thanks. Will give that a go.

    Also, given I am waiting for the new MacBook Pro which is likely to come with USB-C and Thunderbolt 3, I might just hold off until these become available.
     
  4. Samuelsan2001 macrumors 604

    Joined:
    Oct 24, 2013
    #4
    It's quite possibly the cable quality is not up to spec you'll need a mini display port 1.2 to HDMI 2.0 or DP1.2
     
  5. Ries macrumors 68000

    Joined:
    Apr 21, 2007
    #5
    https://support.apple.com/en-us/HT206587

    HDMI max is
    3840x2160 at 30 Hz refresh rate
    4096x2160 at 24 Hz

    You need DisplayPort and:
    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)
     
  6. croco_dile thread starter macrumors regular

    Joined:
    Jun 3, 2016
    #6
    On 30 Hz, cursor movements feels sloppy/jumpy, gives the perception that performance of the Macbook Pro is lagging.

    Looks like HDMI hasn't caught up with the bandwidth required to provide 60 Hz on 4K? And why does my monitor (a very recent model) still offer 2 HDMI inputs vs just 1 DP input. Should be the other way around?
     
  7. kalex macrumors 65816

    Joined:
    Oct 1, 2007
    #7
    HDMI 2.0 is capable of doing 4k resolution. hdmi port on macbook is not 2.0 so you will need to use displayport and possibly use switchresx and clock pixel patch
     
  8. Patcell macrumors 6502

    Joined:
    Aug 8, 2016
    Location:
    Bergen County, NJ
    #8
    As long as you connect the monitor via Displayport 1.2 (supplied by Thunderbolt 2 in this case), your machine will push 3840x2160 @ 60hz. The HDMI interface on all current Macs is HDMI 1.4, which as stated previously is limited to3840x2160 @ 30hz. Minidisplayport/ Thunderbolt to HDMI adapter will not work either - the only option to connect is Displayport or Minidisplayport.
     
  9. croco_dile thread starter macrumors regular

    Joined:
    Jun 3, 2016
    #9
    Thanks. Makes sense and just shows how backwards the Apple pro machines have become.

    And I want to also say that you guys are much more knowledgeable than Apple tech support. I rang them got transferred 3 times and they had no clue.
     
  10. Patcell macrumors 6502

    Joined:
    Aug 8, 2016
    Location:
    Bergen County, NJ
    #10
    Apple is way overdue for a refresh on the Pro line; however, they could not have added HDMI 2.0 in 2015 when the current 13" Pro was released - the Intel Broadwell processors do not support HDMI 2.0.
     

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