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)

Processor

• 3.6GHz
  3.6GHz quad‑core Intel Core i3
  Configurable to 3.2GHz 6-core Intel Core i7, Turbo Boost up to 4.6GHz
• 3.0GHz
  3.0GHz 6-core Intel Core i5 (Turbo Boost up to 4.1GHz)
  Configurable to 3.2GHz 6-core Intel Core i7, Turbo Boost up to 4.6GHz

Memory

• 3.6GHz
  8GB of 2400MHz DDR4 memory
  Configurable to 16GB or 32GB
• 3.0GHz
  8GB of 2666MHz DDR4 memory
  Configurable to 16GB or 32GB

Storage¹

• 3.6GHz
  256GB SSD
  Configurable to 1TB Fusion Drive
• 3.0GHz
  256GB SSD
  Configurable to 1TB Fusion Drive

Graphics

• 3.6GHz
  Radeon Pro 555X with 2GB of GDDR5 memory
• 3.0GHz
  Radeon Pro 560X with 4GB of GDDR5 memory
  Configurable to Radeon Pro Vega 20 with 4GB of HBM2 memory

Video Support and Camera

• 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

Connections and Expansion

• 3.5 mm headphone jack
• SDXC card slot
• Four USB-A ports
• Two Thunderbolt 3 (USB-C) ports with support for:
  • DisplayPort
  • Thunderbolt (up to 40Gb/s)
  • USB 3.1 Gen 2 (up to 10Gb/s)
  • Thunderbolt 2, HDMI, DVI, and VGA supported using adapters (sold separately)
• 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)
• Kensington lock slot

Input

• Magic Keyboard
• Magic Mouse 2
• Configurable with Magic Keyboard with Numeric Keypad
• Configurable with Magic Trackpad 2

Wireless

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

Size and Weight

• Height: 17.7 inches (45.0 cm)
• Width: 20.8 inches (52.8 cm)
• Stand depth: 6.9 inches (17.5 cm)
• Weight: 12.1 pounds (5.48 kg)²

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 90% noncondensing
• Operating altitude: tested up to 16,400 feet (5000 meters)

In the Box

• iMac with Retina 4K display
• Magic Keyboard
• Magic Mouse 2
• Power cord
• Lightning to USB Cable
• Polishing cloth

Operating System

macOS