Operating System:
macOS

Processor:
4.2GHz quad‑core Intel Core i5

System Memory:
8GB (two 4GB) of 2400MHz DDR4 memory; four SO-DIMM slots, user accessible

Storage:
1TB

Graphics:
Radeon Pro 580 with 8GB of VRAM

Display:
Retina 5K display
27-inch (diagonal) Retina 5K display
5120‑by‑2880 resolution with support for one billion colors
500 nits brightness
Wide color (P3)

Wireless:
802.11ac Wi-Fi wireless networking; IEEE 802.11a/b/g/n compatible

Weight:
20.8 pounds (9.44 kg)

Operating System:
macOS

Processor:
3.6GHz quad‑core Intel Core i3

System Memory:
8GB of 2400MHz DDR4 memory

Storage:
1TB

Graphics:
Radeon Pro 555X with 2GB of GDDR5 memory

Display:
Retina 4K display
21.5-inch (diagonal) Retina 4K display
4096-by-2304 resolution with support for one billion colors
500 nits brightness
Wide color (P3)

Wireless:
802.11ac Wi-Fi wireless networking; IEEE 802.11a/b/g/n compatible

Weight:
12.1 pounds (5.48 kg)