Originally released December 2017:

27-inch (diagonal) Retina 5K display; 5120-by-2880 resolution with support for one billion colors
128GB of 2666MHz DDR4 ECC memory
1TB SSD storage1
1080p FaceTime HD camera
Radeon Pro Vega 64 graphics processor with 16GB of HBM2 memory

Processor
2.5GHz 14-core Intel Xeon W processor, Turbo Boost up to 4.3GHz, 33.25MB cache

Memory
128GB 2666MHz DDR4 ECC memory

Storage
1TB SSD storage1

Graphics
Radeon Pro Vega 64 graphics processor with 16GB of HBM2 memory

Video Support and Camera
1080p FaceTime HD camera

Thunderbolt 3 digital video output

Native DisplayPort output over USB‑C

Thunderbolt 2, HDMI, DVI, and VGA output supported using adapters (sold separately)

Input/Output
Nbase-T Ethernet with support for 1Gb, 2.5Gb, 5Gb, and 10Gb Ethernet using RJ‑45 connector
SDXC card slot with support for UHS‑II
Four USB 3 ports
Four Thunderbolt 3 (USB-C) ports with support for
DisplayPort 1.2
Thunderbolt (up to 40 Gbps)
USB 3.1 Gen 2 (up to 10 Gbps)
Thunderbolt 2, HDMI, DVI, and VGA supported using adapters (sold separately)

Audio
Stereo speakers
Four microphones
3.5 mm headphone jack

Wireless
802.11ac Wi-Fi wireless networking; IEEE 802.11a/b/g/n compatible
Bluetooth 4.2 wireless technology

Size and Weight
Height: 20.3 inch (51.6 cm)
Width: 25.6 inches (65 cm)
Depth: 8 inches (20.3 cm) with stand
Weight: 21.5 pounds (9.7 kg)2