Mac computers with built-in HDMI ports Any Mac with a built-in HDMI port can support 4K displays and Ultra HD TVs via HDMI at 3840 x 2160 at 30Hz, or 4096 x 2160 at 24Hz.
Note that mirroring isn't supported at 4096 x 2160 at 24Hz.
Additionally, the built-in HDMI port on Mac mini (2018) supports resolutions up to 4096 x 2160 at 60Hz.
Mac computers compatible with HDMI via adapter The following Mac models support resolutions and refresh rates of up to 1080p at 60Hz, and 3840 x 2160 at 30Hz, over HDMI 1.4b when using the Apple USB-C Digital AV Multiport Adapter with mac OS Sierra 10.12 or later: If the HDMI display that's connected to your Mac starts up to the Apple logo but then goes dark, you might need to update your HDMI cable.
To ensure compatibility, and to achieve 4K resolution, Apple recommends a cable that supports HDMI 2.0 or later, such as the Belkin Ultra High Speed 4K HDMI Cable.
If you use a 60Hz MST display with the Mac Book Pro (Retina, 15-inch, Mid 2015) with AMD Radeon R9 M370X graphics card or i Mac (Retina 5K, 27-inch, Late 2014), only one additional Thunderbolt display is supported. Your Mac automatically detects MST-enabled displays. However, your display might require a firmware update to support 60Hz operation. You need to manually configure 4K displays to use MST.
Follow these steps to use the display's built-in controls to enable this feature: System Preferences, then click Displays to adjust or scale the resolution on your display.
This can make text and objects appear larger or give you more space on your screen.
If your Mac doesn’t recognize a display you’ve just connected, hold down the Option key to make the Detect Displays button appear, then click that button.
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