2nd gen x1c - displayport (version / resolution / frequency) - 4k display?

Hello!
What kind of display am I able to drive via DisplayPort with the 2nd gen x1c?
To be more precise: am I able to drive an external 4k display refreshed more than 30 times / second (as in: 60Hz)?
What version is the DisplayPort about? 1.1? 1.2?
Also, does the used graphics hardware (intel 4400 vs. 5000) make a difference here?
Thanks a lot and have a nice weekend!
daten

Haswell uses DP 1.2. The 2nd Gen X1 Carbon has a DP 1.2.
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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