Mouse & Video Sluggish On 4K

Discussion in 'MacBook Pro' started by dieseltwitch, Mar 9, 2015.

  1. dieseltwitch macrumors regular

    Jan 24, 2008
    I'm loving my 4K display. however I've noticed the mouse is a tad sluggish and video is delayed. Im running a Late 13' MBPr along with a 4k 40" LG via the HDMi port.
  2. Hieveryone macrumors 68040


    Apr 11, 2014
    Yes the 13" MBPr doesn't handle 4K at 60 Hz. It's at 52 Hz. You need to upgrade to the 15" if you want no sluggishness.
  3. dieseltwitch thread starter macrumors regular

    Jan 24, 2008
    I have the 15" sorry, left that out


    I have it running at 30. its the highest I can go with this screen on this MBPr 15". Unless they come out with a DP to HDMI2.0 adapter soon I have to run through the HDMI port :(
  4. Samuelsan2001 macrumors 604

    Oct 24, 2013
    HDMI 30hz

    HDMI will only do a 30 Hz refresh rate. If you are using a 15 inch rMBP you can get 4K at 60 Hz with Minidisplayport to Display Port over thunderbolt.

    You can get 52Hz with the 13 inch over thunderbolt but need some third party software. Don't expect miracles on a 13 inch though that is a lot of pixels for an iGPU to push whatever connection...
  5. yjchua95 macrumors 604

    Apr 23, 2011
    GVA, KUL, MEL (current), ZQN
    You can't use HDMI.

    You must use mDP/DP.

    If your TV only has HDMI, you're out of luck.

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