Hi, here is the link I was referring to.
I now own a PB287Q and can confirm that it runs without any problems at 3840x2160 @30Hz. I guess the trouble I have with this is that Intel has always advertised the D54250WYK as a 4K device. If you look up the definition of what 4K is you will find that it clearly states that 4K is either 3840x2160 @50Hz (PAL) or 3840x2160 @60Hz (NTSC). In recent weeks Intel is now carrying on about H and U class processors with only the H (ie HD5200 IRIS) supporting true 4K. For example, my Gigabyte BRIX 4570 happily runs at both "true" 4K resolutions
Perhaps it is time you came clean and simply said that no current NUC device will ever support true 4K!