You'll also need an active (Mini-)DisplayPort to HDMI 2.0 adapter. You'll have to disable System Integrity Protection (which normally prevents system files from being modified - mostly for security purposes) to add custom "supported" resolutions to the Mac, which involves a reboot once to turn SIP off and again to turn it back on, all the while being more vulnerable than normal to viruses, although probably not vulnerable enough to worry too much as long as you remember to turn it back on. I'm using a Sony 43" 4k TV with HDMI 2.0 right now.įor some reason the MBP insists it can only run it at 30Hz, but with a piece of software such as SwitchResX you can manually add your resolution/refresh rate combination to the list of "supported" resolutions. If any reader has a logical explanation and/or solution for this, please post your answer.Ĭan I do with my early 2015 MacBook Pro Retina? This result has persisted despite restarting my Mac but I do not know if this behavior is limited to my example. The refresh rate on the 4K screen is dropped to 30 Hz if it's one of only two active displays. To sum up, this means that my early 2015 rMBP 13" will only display 4K 60 Hz on the screen capable of doing so if either all 3 displays are active or the 4K display is the only active display. Scenario 3 = 2 desktops without builtin screen:ĭisplay 1 (old) is connected with 900x1440 60 Hz,ĭisplay 2 (4K) is connected with 3840x2160 60 Hz Scenario 2 = 2 desktops with builtin screen:ĭisplay 2 (4K) is connected with 3840x2160 only 30 Hz RMBP Early 2015 with macOS 10.12.6 and 16 GB RAM ĭisplay 1 (old): 900x1440 via mDP-DVI adaptor and DVI cable Display 2 (4K): 3840x2160 via mDP-DP cableĭisplay 2 (4K) is the only desktop displayed at 3840x2160 Hz Also, MacOS does not let me choose the refresh rate for the 4K screen when it's connected through the Mini DisplayPort to DisplayPort cable - other than feeling the difference, I only see the refresh rate in the system profiler. However, there are anomalies on my side when it comes to the refresh rate depending on my screen setup. And the only iMac with a 4K display used a 21.5" panel size (204 ppi).I have a similar device (Early 2015 rMBP with 16 GB running macOS Sierra 10.12.6) and can confirm that it will power an external 4K display at 60 Hz - it's supposed to power two external displays at 4K (3840x2160) in addition to the builtin display, in fact. Notice that on Apple's own iMacs, the 27" versions use either 1440p (108 ppi) or 5K (216 ppi). And if you use a "scaled" setting instead, then content will be rendered in one of those two modes and then will be blown up or shrunken down post-render to resize it as needed, which introduces scaling artifacts. If it instead treats it as a Retina display by using art assets, things will be a bit too large. If your Mac treats it as a standard display, things will be a bit too small. macOS is optimized for standard displays (100-110 ppi) and Retina displays (200-220 ppi), which means that display falls right in between those optimization targets and is therefore an equally bad fit with both. A 27" 4K display is a bad choice for a Mac because that setup results in a pixel density of 163 ppi. If you can, then I suppose it's possible there's some strange interoperability issue that affects that specific combination of equipment.Īlthough fyi if you just got that display and were planning to use it with your Mac a lot, you might want to rethink your display choice if you can still return it. Ok, then it would be helpful if you could test whether you can get 60 Hz even at just 1080p when connecting your MacBook to another display, or even a TV.
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