I've searched around the net and google but could not find the definitive answer to how to run 2016 rm with 4k@60hz on the new LG 27UD68 4K monitor that i just picked up. I'm using Apple Digital AV Multiport adapter and connecting to the monitor using the included HDMI 2.0 cable, but the best I can get is 4k@30hz, which is very laggy on the monitor this size. From 9to5mac article I'm sure this laptop is capable of driving the monitor at 4k@60hz but I'm not seeing how they connect the laptop. Seems like the max refresh rate from the Apple Digital DV Multiport adapter is only at 30hz. Can someone who have successfully get 4k@60hz working share the type of cable/connections that I need to make and buy? Do I need to get a single USB C to Display Port 1.2 cable or USB C to HDMI 2.0 cable (bypass Apple adapter) in order to achieve 4k@60hz? Any help would be appreciated. Thanks.