Late 2015 iMac (Retina 4K & 5K)

General:

• Model: iMac (Retina 4K, 21.5-inch & Retina 5K, 27-inch, Late 2015)
• Release Date: October 2015
• Discontinued: June 2017
• Dimensions:
  • 21.5-inch: Height: 17.7 inches (45.0 cm), Width: 20.8 inches (52.8 cm), Depth: 6.9 inches (17.5 cm)
  • 27-inch: Height: 20.3 inches (51.6 cm), Width: 25.6 inches (65.0 cm), Depth: 8 inches (20.3 cm)
• Weight:
  • 21.5-inch: 12.5 pounds (5.68 kg)
  • 27-inch: 21 pounds (9.54 kg)

Display:

• Size:
  • 21.5-inch: 21.5-inch widescreen LED-backlit Retina 4K display with IPS technology
  • 27-inch: 27-inch widescreen LED-backlit Retina 5K display with IPS technology
• Resolution:
  • 21.5-inch: 4096 x 2304 pixels (4K)
  • 27-inch: 5120 x 2880 pixels (5K)

Processor:

• CPU:
  • 21.5-inch:
    • 3.1 GHz Quad-Core Intel Core i5 (I5-5675R)
    • 3.3 GHz Quad-Core Intel Core i7 (I7-5775R) (Build to order)
  • 27-inch:
    • 3.2 GHz Quad-Core Intel Core i5 (I5-6500)
    • 3.3 GHz Quad-Core Intel Core i5 (I5-6600)
    • 3.4 GHz Quad-Core Intel Core i7 (I7-6700K) (Build to order)
• Turbo Boost: Up to 3.9 GHz
• L3 Cache: 4 MB (Core i5), 8 MB (Core i7)

Memory:

• RAM:
  • 21.5-inch: 8 GB of 1867 MHz LPDDR3 onboard memory
  • 27-inch: 8 GB (two 4 GB SO-DIMMs) of 1867 MHz DDR3 SDRAM
• Expandable:
  • 21.5-inch: Not user-upgradeable
  • 27-inch: Up to 64 GB (four 16 GB SO-DIMMs, user accessible)

Storage:

• Hard Drive:
  • 21.5-inch: 1 TB hard drive (5400 rpm)
  • 27-inch: 1 TB Fusion Drive (base model) or 2 TB/3 TB Fusion Drive (higher-end models)
• Optional Storage:
  • SSD: 256 GB, 512 GB, or 1 TB

Graphics:

• 21.5-inch:
  • Intel Iris Pro Graphics 6200 (base model)
• 27-inch:
  • AMD Radeon R9 M380 with 2 GB of GDDR5 memory (base model)
  • AMD Radeon R9 M390 with 2 GB of GDDR5 memory (mid-range model)
  • AMD Radeon R9 M395 with 2 GB of GDDR5 memory (higher-end model)
  • AMD Radeon R9 M395X with 4 GB of GDDR5 memory (Build to order)

Connectivity:

• Wi-Fi: 802.11ac Wi-Fi wireless networking; IEEE 802.11a/b/g/n compatible
• Bluetooth: 4.0
• Ethernet: 10/100/1000BASE-T Ethernet (RJ-45)
• USB: Four USB 3.0 ports
• Thunderbolt:
  • 21.5-inch: Two Thunderbolt 2 ports (up to 20 Gbps)
  • 27-inch: Two Thunderbolt 2 ports (up to 20 Gbps)
• SDXC Card Slot: One SDXC card slot

Audio:

• Audio Output: Built-in stereo speakers, headphone/optical digital audio output (minijack), support for Apple iPhone headset with microphone
• Audio Input: Dual microphones

Operating System:

• Original OS: OS X El Capitan
• Supported OS: Upgradable to macOS Monterey

Additional Features:

• FaceTime HD Camera: Built-in FaceTime HD camera
• Keyboard and Mouse: Comes with Apple Magic Keyboard and Magic Mouse 2 or Magic Trackpad 2

Design:

• Material: Aluminum and glass unibody enclosure