The Iris Xe GPU on that processor core cannot run 240 Hz refresh, no.  
Hey I Have a Latitude 3520, the I7 version, and i would like to attach a 240hz at 1920x1080 screen to it. Is this possible? I have a wd19 dock that i have tried to connect to it, bu i can only go to 120hz. Can i run it through this? Hope you will be able to help   Kristian Dybdal
Latitude 3520 and wd19