27″ Retina 5K iMac (Late 2015)

Apple took the 27″ Retina 5K iMac a step further with fifth generation Intel processor technology, state of the art AMD graphics, an even better Retina display with 25% greater color gamut – and at $500 less than the Late 2014 Retina iMac retailed for a year ago.

27-inch Retina 5K iMac Late 2015As we said then, 4K resolution (4096 x 2160 pixels) is the extra high definition of the future, and to properly edit 4K video, you need a display that has room for all the controls a video editor needs. Hence the 5K Retina iMac with twice the vertical and horizontal resolution of the discontinued non-Retina 27″ iMac.

With OS X 10.11 El Capitan, all Retina iMacs support a new 30-bit color mode with 10 bits per color channel. This is a big step forward from 24-bit color (8 bits each for red, green, and blue) in providing improved color gradation without banding. For now, only some Apple apps support 30-bit color, but that will change over time.

The Late 2015 iMac also ships with the new Magic Keyboard and Magic Mouse 2 plus a Lightning to USB cable to charge them. Options include Magic Trackpad 2, up to 32 GB of memory, 1-3 TB Fusion Drives, and 256 GB to 1 TB SSDs. The 3.3 GHz model can also be ordered with AMD Radeon R9 M395X graphics.

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  • introduced 2015.10.20 at US$1,999
  • Identifier: iMac15,1
  • Model no.:
  • Part no.:

Mac OS

Core System

  • CPU: 3.3 GHz (3.7 GHz Turbo Boost) quad-core Intel Core i5
  • L2 cache: 3 MB shared cache
  • Bus: 1600 MHz
  • RAM: 8 GB (2 x 4 GB) of 1600 MHz DDR3 memory, 4 SO-DIMM slots, expandable to 16 GB or 32 GB
  • Performance:
    • Speedmark 9:
    • Geekbench 3, 32-bit single-core:
    • Geekbench 3, 32-bit multicore:
    • Geekbench 3, 64-bit single core:
    • Geekbench 3, 64-bit multicore:


  • GPU: Radeon R9 M290 graphics with 2 GB memory, supports up to 3840 x 2160 on external display
  • Display: 27″ 5120 x 2880 LED backlit flat panel display supports 30-bit color
  • Video out: Mini DisplayPort, DVI and VGA with optional adapters


  • drive bus: 6 Gbps SATA Rev. 3
  • Storage: 1 TB Fusion Drive standard, 3 TB Fusion Drive optional. 256 GB, 512 GB, or 1 TB SSD optional.
  • SuperDrive: external

ports on iMac 5K


  • Thunderbolt 2: 2 ports
  • USB: 4 USB 3 ports
  • FireWire 400: via Thunderbolt adapter
  • FireWire 800: via Thunderbolt adapter
  • Ethernet: 10/100/gigabit
  • WiFi: 802.11ac AirPort Extreme built in, three antennas support up to 1.3 Gbps bandwidth
  • Bluetooth 4.0: included
  • IR receiver: none
  • SD Card: 1 slot, supports SDXC
  • Microphone: internal
  • Modem: No longer offered by Apple


  • H x W x D: 20.3 x 25.6 x 8.0 in/516 x 650 x 203 mm
  • Weight: 21 lb/9.54 kg
  • Power supply: unknown capacity

CPU Upgrades

  • none

Online Resources

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