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) display21.5-inch (54.61 cm) display Retina 4k display27-inch (68.58 cm) Retina 5k display
1920*1080 resolution4096*2304 resolution5120*2880 resolution
500 nits brightness500 nits brightness
Processor
Dual-core Intel Core i5Quad-core Intel Core i5Quad-core Intel Core i5
Memory
8GB8GB8GB
Storage2
1TB hard drive1TB hard drive or
1TB Fusion Drive
1TB or 2TB Fusion Drive
Graphics
Intel Iris Plus Graphics 640Radeon Pro 555 or 560Radeon Pro 570, 575 or 580
Wireless
802.11ac Wi-Fi802.11ac Wi-Fi802.11ac Wi-Fi
Bluetooth 4.2Bluetooth 4.2Bluetooth 4.2
Connections and Expansion
Two Thunderbolt 3 (USB-C) portsTwo Thunderbolt 3 (USB-C) portsTwo Thunderbolt 3 (USB-C) ports
Four USB 3 portsFour USB 3 portsFour USB 3 ports
SDXC card slotSDXC card slotSDXC card slot
Camera
FaceTime HD CameraFaceTime HD CameraFaceTime HD Camera
Keyboard and Mouse
Magic KeyboardMagic KeyboardMagic Keyboard
Magic Mouse 2Magic Mouse 2Magic Mouse 2