A:Answer Depends on the Mac, most Mac's support either DP or miniDP (TB/TB2/TB3), given that this monitor only supports HDMI inputs you will need a TB/TB2/TB3 to HDMI converter, on my older 2011 MBP, it would only support QHD resolution with native DP output, whenever I tried to use a miniDP/TB to HDMI converter the mac would only support FullHD resolution.
My other MBP's 2015/2017 didnt have any issues when using a TB2->HDMI or TB3->HDMI adapter cables a such could support QHD resolutions.