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Jun 27, 2016 9:08 AM in response to walt168by NicCorleone,I had this issue if I used the HDMI cable with the Mini DisplayPort to HDMI Adapter.
Try getting a DisplayPort to Thunderbolt cable to get 4k @ 60Hz. That's what I am using and its working great (Retina Late 2013).
If you use a HDMI cable without the adapter then I think you will only get 4k @ 30hz.
