The screen is a Samsung U28D590 3840 x 2160 @ 30Hz (max reso on intel 4000 graphics) via a Thunderbolt->DisplayPort cable. Initially not directly supported, that is, the resolution was not recognized by the OS as-is, but has been enabled with the SwitchResx app here http://www.madrau.com/ which somehow tweaks the system telling it about this new resolution. Many use this utility app. It runs OK from the start since summer 2015. Pharo 5.0 runs fast and stable without problems.
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