I have a MacBook Pro (13-inch, Mid 2012) running OS X El Capitan version 10.11.4. I am attempting to use an external display with my Dell U2715Q (has 4k capabilities). I purchased an AmazonBasics miniDisplayPort to HDMI adapter and I am getting 1920x 1080 as my max resolution.

My question is: how can I obtain the full max resolution with my mac and monitor set up?

According to the official website I should be able to reach 2560 x 1600:

Dual display and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 2560 by 1600 pixels on an external display, both at millions of colors

  • Can you please change your title to "How to reach full resolution on external monitor?" As the current title indicates you want your built in monitor to display at full resolution. Commented May 11, 2016 at 3:52
  • you might wanna check this link out. worked for a whole lot of other people. although it didn't work for me. apple.stackexchange.com/questions/250528/…
    – Vee
    Commented Oct 3, 2016 at 0:59

1 Answer 1


HDMI is limited to 1920x1080. You will need to connect the monitor with a mini DP to DP cable.

  • The HDMI protocol can support 4K and higher, but maybe the HDMI input on this particular monitor is limited to HD, or the adapter is limited. I agree, MiniDP to DP cable should solve the problem.
    – Elliott
    Commented Jun 24, 2019 at 7:39

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