Apple iMac “Core i5″ 1.6 GHz 21.5” 2015 Specs

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iMac – MK142LL/A – iMac16,1 – A1418

About this iMac

The Apple iMac Intel Aluminum released October 13, 2015, had some uniqueness of its own from the other models such as the 802.11ac Wi-Fi which is backward compatible with the 802.11 a/b/g/n Wi-Fi. It had an 8 GB of onboard 1867 MHz LPDDR3 SDRAM. The “thick-at-the-middle-thin-at-the edges” design remained the same in this release of the computer just as in late 2012, late 2013, and mid-2014 versions. This a1418 iMac had all the needs of this generation of computing packed into its 45.0 cm, 52.8 cm, 17.5 cm and featured a lightweight of 12.5 lbs. (5.68 kg)casing.

1.6 GHz Intel i5

8 GB

1 TBHard Drive

Plugged-in

Storage & Memory

The device was built with 1 TB Serial ATA (6Gb/s) hard drive storage with a disk speed of 5400 RPM.

Screen Size and Resolution

The iMac Intel Aluminum version featured a 21.5 inch screen 1920×1080 LED-backlit 16:9 widescreen IPS display.

OS & Processor

The iMac had the Mac OS X 10.11 (15A2301) operating system pre-installed on it. It was powered by 14-nm “Broadwell” 1.6 GHz Intel “Core i5” processor (5250U) with two independent processor “cores” on a single chip. Its graphics processor was the “integrated” Intel HD Graphics 6000 graphics processor that shares system memory.

Memory & Architecture

The device was built with a 3 MB on-chip level 3 cache with an 8 GB of onboard 1867 MHz LPDDR3 SDRAM. Its design was centered on a 64-Bit architecture.

Upgradability

The iMac came with 8 GB of RAM it could be upgraded up to 16 GB of RAM.The Operating System of the iMac can also be upgraded from its pre-installed Mac OS X 10.11 (15A2301) up to the current macOS 11. This iMac was also able to run Windows 7 (64-Bit) and more recently Windows 10 (64-Bit).
This iMac had the following dimensions of 45.0 cm, 52.8 cm, 17.5 cm, and a weight of 12.5 lbs. (5.68 kg).

Inclusive Features

The iMac includes the following features and ports:

A Power Adapter (100V-240V (50 Hz to 60 Hz, single phase))
802.11ac Wi-Fi
Gigabit Ethernet
A Mini DisplayPort allowing dual and mirroring operations with resolutions of up to 2560×1600.
Stereo Speakers
Thunderbolt Ports
FaceTime HD webcam

Introduced: October 13, 2015		Discontinued: June 5, 2017
Screen Size and Resolution		Memory
Screen Size	21.5 inches TFT	Level 1 Cache	32k/32k
Resolution	1920×1080	Level 2/Level 3 Cache	256k x2, 3 MB (on chip)
Processor		RAM Type	LPDDR3 SDRAM
Processors	1 (2 Cores)	Min. RAM Speed	1867 MHz
Architecture	64-Bit	Standard RAM	8 GB
Speed	1.6 GHz (Turbo Boost 2.7 GHz)	Maximum RAM	16 GB
Type	Core i5 (I5-5250U)	RAM Slots	No
Processor Upgrade	Soldered	Motherboard RAM	8
FPU	Integrated	Graphics
System Bus Speed	5 GT/s	Video Card	HD Graphics 6000
Cache Bus Speed	1.6 GHz (Built-in)	VRAM Type	Integrated
ROM/Firmware	EFI	Standard VRAM	1.5 GB
EFI Architecture	64-Bit	Maximum VRAM	1.5 GB
Storage		Inclusive Features and Ports
Standard Storage	1 TB HDD	Standard Optical Drive	None
Storage Speed	5400 RPM	Standard Ethernet	10/100/1000Base-T
Storage Dimensions	2.5” (7 mm)	Standard Modem	None
Storage Interface	Serial ATA (6 Gb/s)	Standard AirPort	802.11ac
Battery		Standard Bluetooth	4.0
Type	N/A	USB Port 3.0	4
Battery Life	N/A	FireWire Ports	None
Description		Keyboard	Apple Wireless Keyboard
Case Type	All-in-One	Inclusive Input	Magic Mouse/Trackpad
Form Factor	21.5 iMac Late 2012	S-Video Output	None
Apple Order No	MK142LL/A	Microphone	2 (Built-in)
Apple Subfamily	Late 2015	Headphone	1
Apple Model Number	A1418 (EMC 2889)	Sound Out	1
Model ID	iMac16,1	Power	1

Identifier reference: MK142LL/A, A1418, EMC 2889, iMac16,1. Use these together because one Apple identifier can sometimes cover multiple configurations.

Last reviewed by Techable: August 19, 2025Identifiers checked: order number, A-number, EMC, and model identifier when available.

Model summary

This iMac at a glance

Family: iMac
Order Number: MK142LL/A
Model Number: A1418
EMC: 2889
Model ID: iMac16,1
Year: 2022

Use the order number, A-number, EMC, and model identifier together when comparing, buying, or selling this device.

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Next steps

Use the spec table to confirm the exact device, then choose the right lookup, buy, or sell path.

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Common questions

Is MK142LL/A the same as A1418?

Not exactly. MK142LL/A usually points to a specific retail configuration, while A1418 identifies the broader Apple hardware family. Always check the EMC and model identifier too.

What iMac is model A1418?

A1418 is the Apple A-number shown for this iMac family. Use the order number, EMC, and model identifier on this page to narrow the exact configuration.

What does EMC 2889 mean?

The EMC number is another Apple hardware identifier. It helps separate closely related models that may share a similar name, year, or A-number.

Can the RAM or SSD be upgraded?

Check the spec table for the exact configuration. Many newer Apple Silicon Macs have memory and storage integrated into the board, so RAM and SSD upgrades are often not practical after purchase.

What macOS versions work with this model?

Use the model identifier, release year, and processor family from the spec table when checking macOS compatibility. Compatibility can change as Apple releases new macOS versions.

Is this iMac still worth buying used?

It can be, depending on price, battery health, memory, storage, and condition. Compare this exact order number and model identifier against similar Techable listings before buying.

How much is this iMac worth?

Value depends on RAM, storage, battery health, cosmetic condition, accessories, and market demand. Use the SellMac path on this page for a quote or use the identifiers here when comparing resale prices.

What should I search if this page is not the exact configuration?

Search the order number first when available, then compare the A-number, EMC, model identifier, year, chip, RAM, and storage. The same A-number can cover more than one configuration.

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