Naturally, things are quite small at that resolution, so you probably won’t want to do this often, but there may be times when you want to keep your eye on several windows at a time, and only a high resolution like that will work.The 2014 iMac limits output to 3840x2160 pixels so the raw pixels should support 5120x1440 with room to spare. I could choose to set its display to 2560×1600 that’s not the resolution that looks like half that, which is the default, but a resolution that actually uses using every pixel of the display. For example, in the screenshot below, you can see the options available on my 12-inch MacBook. This utility lets you quickly switch resolutions without going to System Preferences, but also lets you choose from non-Retina resolutions. Maybe you want even more choice in the resolution of your display. Resolutionator offers a wider range of resolutions, and also lets you switch quickly from the menu bar, or using a keyboard shortcut. Select the display in the preference pane’s popup menu, then hold down the Option key and click the Scaled button to see your options.

If you have a second display connected to your Mac, you can choose a resolution for that display, also from the Displays pane of System Preferences. Naturally, these laptops offer other scaled options each lets you choose from a total of four resolutions, from 1024×640 to 1440 900 (12-inch MacBook) or 1680×1050 (13-inch MacBook Pro).

So it looks like the same number of pixels, but on a display that’s one inch smaller diagonally. Its display has a resolution of 2304×1440, but the default “looks like” resolution it uses is not half that, but a bit more: 1280 x 800, just like the 13-inch MacBook Pro. Things are a bit different with Apple’s 12-inch Retina MacBook. The 13-inch Retina MacBook Pro has a native resolution of 2560×1600 and uses a default “looks like” resolution of 1280×800.

2017 mac mini graphics resolution