It seems that with these damn adapters everyone has a different way, some are 4k60hz, some are not. I'm one of those guys who didn't get 60Hz. As you can see in my screenshot of the PC tab in Nvidia Control Panel settings, I can only select 3840x2160 at 30Hz via DisplayPort. My graphics card has 3 DisplayPort (1.4) ports and my TV supports HDMI 1.4 and 2.0. I don't know what to do with it. ::shrugs::
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