21.5-inch (54.61 cm)  

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21.5-inch (54.61 cm) with Retina display

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27-inch (68.58 cm) with Retina display

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Display1
21.5-inch (54.61 cm) display 21.5-inch (54.61 cm) display Retina 4k display 27-inch (68.58 cm) Retina 5k display
1920*1080 resolution 4096*2304 resolution 5120*2880 resolution
500 nits brightness 500 nits brightness
Processor
Dual-core Intel Core i5 Quad-core Intel Core i5 Quad-core Intel Core i5
Memory
8GB 8GB 8GB
Storage2
1TB hard drive 1TB hard drive or
1TB Fusion Drive
1TB or 2TB Fusion Drive
Graphics
Intel Iris Plus Graphics 640 Radeon Pro 555 or 560 Radeon Pro 570, 575 or 580
Wireless
802.11ac Wi-Fi 802.11ac Wi-Fi 802.11ac Wi-Fi
Bluetooth 4.2 Bluetooth 4.2 Bluetooth 4.2
Connections and Expansion
Two Thunderbolt 3 (USB-C) ports Two Thunderbolt 3 (USB-C) ports Two Thunderbolt 3 (USB-C) ports
Four USB 3 ports Four USB 3 ports Four USB 3 ports
SDXC card slot SDXC card slot SDXC card slot
Camera
FaceTime HD Camera FaceTime HD Camera FaceTime HD Camera
Keyboard and Mouse
Magic Keyboard Magic Keyboard Magic Keyboard
Magic Mouse 2 Magic Mouse 2 Magic Mouse 2