iMac Retina 4K 21.5-inch Late 2015 Datasheet

iMac 21.5-inch
Source: apple.com – iMac 21.5-inch

The Apple iMac Retina 4K 21.5-inch Late 2015 is a personal computer designed, manufactured, and sold by Apple from 2015 to 2017 as part of the iMac series. The computer was introduced on October 13, 2015, and its price started at $1,499.

The new iMac features a 3.1 GHz Intel Core i5 or 3.3 GHz Intel Core i7 processor, 8 GB or 16 GB of RAM, 21.5-inch high-resolution Retina 4K glossy LED-backlit IPS LCD Display, 1 TB hard drive, Ambient Light Sensor, FaceTime HD camera, two Thunderbolt 2 ports USB 3.0 ports, an SDXD card slot, and 1.5 GB Intel Iris Pro 6200 graphics in the base model.

This iMac has been discontinued on June 5, 2017. Today iMac Retina 4K 21.5-inch Late 2015 is 8 years old!

iMac Retina 4K 21.5-inch Late 2015 Details

IntroducedOctober 13, 2015 – 8 years ago
DiscontinuedJune 5, 2017 – 7 years ago
Last Software UpdateMay 13, 2024 – 35 days ago
Time on the Market19 months (1 year)
Time of Support104 months (8 years)
Model IdentifieriMac16,2
Model NumberA1418
Order NumberMK452LL/A
Original Price$1,499
ColorsSilver Aluminum
Weight12.5 Ibs.
5.669 KG
Dimensions17.7” H x 20.8” W x 6.9” D
44.95 cm H x 52.83 cm W x 17.52 cm D

iMac Retina 21.5-inch Tech Specs


ProcessorIntel Core i5 5675R “Broadwell” (3.1 GHz)
Intel Core i7 5775R “Broadwell” (3.3 GHz)
Processor Speed3.1 GHz
3.3 GHz
Maximum Processor SpeedUp to 3.6 GHz (Core i5)
Up to 3.8 GHz (Core i7)
Number of Cores4
System BusIntel Direct Media Interface (DMI) at 5 GT/s
Cache4 MB L3 (Core i5)
6 MB L3 (Core i7)

Storage & Media

Storage1 TB HDD
1 TB Fusion Drive
2 TB Fusion Drive
256 GB SSD
512 GB SSD


Built-in Memory8 GB integrated PC3-14900 204-pin LPDDR3 1867 MHz
16 GB integrated PC3-14900 204-pin LPDDR3 1867 MHz
Maximum Memory16 GB
Memory SlotsNone
Interleaving SupportYes


Built-in Display21.5″ high-resolution Retina 4K IPS LED-backlit LCD glossy widescreen Display
Display GlassStandard
Color GamutWide color gamut P3
Pixel Density219 ppi
Resolutions4096 x 2304


Graphics CardIntel Iris Pro Graphics 6200
Graphics MemoryUp to 1.5 GB shared from main memory
Display Connection2 – Thunderbolt 2
Display SupportSupport for up to two Thunderbolt displays
Display ModesDual display extended, video mirroring, and AirPlay Mirroring
External ResolutionUp to 4096 x 2304 pixels
CameraFaceTime HD


Expansion Slots1 – Secure Digital (SDXC)
Hard Drive Interface1 – 6 Gbps Serial ATA (SATA)
1 – 8.0 GT/s PCIe x4


Ethernet10/100/1000BASE-T (RJ-45)
BluetoothBluetooth 4.0
USB4 – Up to 5 Gbps
Thunderbolt2 – Thunderbolt 2 (Up to 20 Gbps)
Audio In1 – 3.5-mm analog/optical combo jack
2 – Microphones
Audio Out1 – 3.5-mm analog/optical combo jack
2 – Built-in speakers
Display2 – Thunderbolt 2

Keyboard and Mouse

PeripheralsMagic Keyboard
Magic Mouse 2 or Magic Trackpad 2


Original OSOS X 10.11
Later OSOS X 10.11.1
Maximum OSmacOS 12.7.5
FirmwareIntel Extensible Firmware Interface
Unlock with Apple WatchSupported with macOS Sierra (Apple Watch (1st generation), Apple Watch Series 1, and Apple Watch Series 2)
macOS High Sierra or later (Apple Watch Series 3 or later)
Bundled SoftwareOS X 10.11


Backup Battery3 V CR2032 Lithium
Maximum Continuous Power205 W
Line Voltage100-240 V AC

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Disclaimer: The data presented in this article is under continuous development and has been manually collected from various sources based on their availability. The author of this article may revise this dataset as additional research is conducted and reviewed. Please note that the information is provided “as is” and “as available” without express or implied warranties. The author cannot be held responsible for any omissions, inaccuracies, or errors in the published information. Any warranties relating to this information are hereby disclaimed.