Display:  Retina 5K display / 27-inch (diagonal) Retina 5K display / 5120x2880 resolution with support for one billion colors /  500 nits brightness / Wide color (P3)

Processor :  3.5GHz / 3.5GHz quad‑core Intel Core i5 (Turbo Boost up to 4.1GHz)

Memory : Capacity: 8GB (two 4GB) / MHz: 2400Mz / DDR: DDR4

Storage :  Capacity: 1TB /  Configurable to 2TB Fusion Drive or 256GB, 512GB, or 1TB SSDConfigurable to 2TB or 3TB Fusion Drive or 256GB, 512GB, or 1TB SSD

Size and Weight :  Height: 20.3 inches (51.6 cm) / Width: 25.6 inches (65.0 cm) / Stand depth: 8 inches (20.3 cm) / Weight: 20.8 pounds (9.44 kg)2

Graphics : Radeon Pro 575 with 4GB of VRAM

Video Support & Camera :  FaceTime HD camera : Simultaneously supports full native resolution on the built-in display at 1 billion colors 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

Connections and expansions :  3.5 mm headphone jack 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 (sold separately) / 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector) Kensington lock slot

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

Audio : Stereo speakers Microphone 3.5 mm headphone jack Support for Apple iPhone headset with microphone

Electrical and operating requirements : Line voltage: 100–240V AC Frequency: 50Hz to 60Hz, single phase Operating temperature: 50° to 95° F (10° to 35° C) Relative humidity: 5% to 95% noncondensing Operating altitude: tested up to 10,000 feet

Operating system : macOS High Sierra

In the box : Mac with Retina 5K display Magic Keyboard Magic Mouse 2 Power cord Lightning to USB Cable