UP2414Q

Hi, I've recently purchased a Dell UP2414Q monitor and everything is working fine at 30hz, but having problems running at 60HZ 3840x2160. I've had some success but am getting corruption on the screen when moving windows around, excessive tearing down the middle of the screen (where the 2 halves are joined). This is the 2nd monitor I've tried so I'm beginning to wonder whether anything needs to be setup on the laptop for this mode to function correctly?

thx Lee