Monitors Want to run external 4k display at 60hz

Hi,
I have a samsung 27-inch 4k monitor which has a HDMI (1.2) and display port (1.3) I think.
I use a HDMI cable and get 4k @ 30hz . I want to use the display port.
But very little laptops have this port.
I'm going to buy the new xps 15 or the latest macbook pro 15 .
XPS still has HDMI 1.2 and no display port , and both XPS and macbook has thunderbolt 3.
How can I get 4k at 60hz from these machines?
Gonna use it for work and no gaming
 
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