I just got myself a P2415Q 4K monitor and was looking forward to get more screen real-estate. Unfortunately I either get 3840x2160 Native, which have UI elements way too small, or 1920x1080 HiDPI with elements too big. If I try to do something in between, it just ends up getting not sharp. There's no 1440 HiDPI for some reason. I went through many hoops, went through a lot of posts on both MacRumors and on TonyMacX86.com, resulting in the following attempts... 1. Buying Accell mDP -> DP cable: It's claimed in a thread that this is one of the few properly DisplayPort 1.2 certified cable. But no, it didn't make any difference. 2. SwitchResX with SIP disabled: Anything over 3840x2160 scaled is deemed 'Invalid'. (1440 HiDPI means 5120 x 2880 scaled down by 2...) 3. Manually fiddle with DisplayProductID plists. I put in all the valid resolution between 1080p scaled and 1440p scaled with no avail. All did not appear in either SwitchResX nor RDP. 4. Tried to do (3) with custom EDID that I modified to either 51Hz or 30Hz. They did successfully enable 51Hz 1080 HiDPi or 51hz 2160 Native. But none of the refresh rate combo enabled any HiDPI modes aside from 1080 HiDPI Is this a limitation of a Late 2013 13" rMBP? Something wrong with Sierra? Or am I missing something here? Very disappointed in Mac's support of 4K monitors. Please help.