8GB of 2400MHz DDR4 memory, Configurable to 16GB or 32GB
Graphics and Video Support:
Radeon Pro 555X with 2GB of GDDR5 memory
Storage:
1TB (5400-rpm) hard drive
Display :
21.5-inch (diagonal) Retina 4K display 4096-by-2304 resolution with support for one billion colors; 500 nits brightness; Wide color (P3)
Camera & Video Support:
FaceTime HD camera
Simultaneously supports full native resolution on the built-in display at millions of colors (21.5-inch) or 1 billion colors (21.5-inch 4K) and:
One 5120‑by‑2880 (5K) external display at 60Hz with support for 1 billion colors, or
Two 3840-by-2160 (4K UHD) external displays at 60Hz with support for 1 billion colors, or
Two 4096‑by‑2304 (4K) external displays at 60Hz with support for millions of colors
Thunderbolt 3 digital video output: Native DisplayPort output over USB‑C; Thunderbolt 2, HDMI, DVI, and VGA output supported using adapters (sold separately)
Audio:
Stereo speakers
Microphone
3.5 mm headphone jack
Connection and Expansion:
SDXC card slot
Four USB 3 ports (compatible with USB 2)
Two Thunderbolt 3 (USB-C) ports with support for: DisplayPort; Thunderbolt (up to 40 Gbps); USB 3.1 Gen 2 (up to 10 Gbps); Thunderbolt 2, HDMI, DVI, and VGA supported using adapters
