Monitor Refresh Rate Confusion

Nov 6, 2018
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My monitor is 60hz and 4k. When I am running it @4k it only gives me 30hz, but anything below 1440p gives me 60hz. Is it that my computer is unable to run 4k@60hz?
Monitor: Samsung U28E510D
Do I need a better computer to run 4k@60hz?
 


Yes, Im using HDMI, with my macbook pro plugged in. Is the computer just too weak to run 4k@60hz?