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crimsontime
25
Feb 20, 2018
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I have a mid 2015 macbook that has Thunderbolt 2. In order to get 60hz, you have to use the display port connection and you need a Mini DisplayPort to DisplayPort Cable. HDMI connection on this mac will only get you 30hz. I ordered this cable from Amazon and it works: https://www.amazon.com/gp/product/B01N5RY8D7 and it works.
Weirdly, you can't actually see the refresh rate in System Preference monitors for this monitor when using display port (it did display as 30hz when using HDMI. This is all it shows with display port connection:
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To see that I got refresh rate I installed the cscreen terminal app. If you use homebrew, you can install it with 'brew cask install cscreen'. It outputs like this:
DisplayID Index Depth Width Height Refresh 1a49e846 1 32 1920 1080 60
From that I could tell I got the 60hz refresh rate.
Edit: You can also use this one for Thunderbolt 2 to HDMI 2.0 and get 60hz (it's better if you want HDMI Deep Color): https://www.amazon.com/Plugable-DisplayPort-Supports-displays-3840x2160/dp/B00S0BWR2K
Edit: You may also need the SwitchResX app if your mac still won't apply the 60hz resolution
Feb 20, 2018
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