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Apple 21.5″ iMac with Retina 4K display, Quad-Core Intel Core i5 3.1GHz, 8GB RAM, 1TB SATA hard drive, Intel Iris Pro Graphics 6200, Two Thunderbolt 2 ports, 802.11ac Wi-Fi, Apple Magic Keyboard, Magic Mouse 2 – Late 2015 (MK452LL/A)

The 21.5″ iMac with Retina 4K Display has a native resolution of 4096 by 2304 pixels and provides 9.4 million pixels, which is 4.5 times more than the Full HD 1080p. It also features a P3-based color gamut that’s designed to let the Retina display provide 25% larger color space than standard sRGB displays.

With higher resolution and more available colors, the 21in iMac Retina i5 desktop is able to produce more vivid images with greater detail, and allow for crisp, clear text and support for 4K photos and videos.

The iMac with Retina 4K Display runs the macOS Sierra operating system, which is specifically designed for the Retina display. Built on a solid UNIX foundation, macOS Sierra was engineered to take full advantage of the iMac’s hardware. It features performance improvements and updates to built-in apps. It also brings a system font called San Francisco that was fine-tuned for optimal readability on a Retina 4K display.

The iMac is also fused with a quad-core 5th-gen Broadwell Intel Core i5 processor. Its quad cores can reach a stock speed of 3.1 GHz and can be overclocked up to 3.6 GHz, thanks to Intel Turbo Boost 2.0 technology. Even more, the 5th-gen Broadwell Intel processor on this iMac uses low voltage for better energy efficiency while still providing fast performance. And, combined with 8GB of 1867 MHz LPDDR3 onboard RAM, the iMac 3.1ghz Intel core i5 desktop allows you to multitask quickly and efficiently.

Other great features of the iMac 4K 21 3.1GHz i5 include 802.11ac Wi-Fi & Bluetooth 4.0 wireless technologies, dual Thunderbolt 2 ports (which also double as Mini DisplayPorts), four USB 3.0 ports, an SDXC card slot, a Gigabit Ethernet (RJ-45) jack, and a Kensington lock slot for added security.

Order your 21.5″ iMac with Retina 4K Display here at MacMall now! Also available, Apple AirPort Time Capsule 2TB with 802.11ac Wi-Fi.

The idea behind iMac has never wavered: to craft the ultimate desktop experience. The best display, paired with high-performance processors, graphics, and storage – all within an incredibly thin, seamless enclosure. And that commitment continues with the all-new 21.5-inch iMac with Retina 4K display. Like the revolutionary 27-inch 5K model, it delivers such spectacular image quality that everything else around you seems to disappear. Adding up to the most immersive iMac experience yet – and another big, beautiful step forward.

Retina Display

More than just a display, it’s a vision.

Accuracy. Brightness. Clarity. Regardless of how you measure the quality of a display, Retina is in a class by itself. The pixel density is so high that you won’t detect a single one while using iMac. Text is so sharp, you’ll feel like you’re reading email and documents on a printed page. And with a new, wider color gamut, the Retina display is able to deliver even more available colors – 25 percent more. So every photo and video you see appears even more true to life.


Innovation from edge to cutting edge.

An incredible amount of engineering was required to bring the Retina display to the iMac family. Witness a design that’s just 5 mm at its edge – yet entirely capable of making everything around you fade into the distance. This ensures that nothing gets between you and your favorite content. Seamless and beautiful, iMac with Retina display is an elegant addition to your workspace, representing a depth of technology at the height of design.

Fusion Drive

Storage that’s lightning fast. And whip smart.

Storage is about space. But it’s also about speed and performance. A Fusion Drive gives you the best of both worlds. This innovative storage technology intelligently combines speedy flash storage with a high-capacity hard drive. Your frequently used apps, documents, and photos stay on the faster flash storage, while infrequently used items move to the hard drive. And as the system learns how you work, you’ll experience faster application launching and quicker file access. Fusion Drive can be configured with up to 3TB of storage. But for those who want the ultimate performance, there’s an all-flash option that’s now up to 2.5 times faster than the previous version.


Built for speed. And everything else.

Faster and more powerful than ever, the 27-inch iMac is equipped with a sixth-generation Intel Core processor and the latest AMD high-performance graphics. And the 21.5-inch iMac features a fifth-generation Intel Core processor and enhanced Intel Iris Pro Graphics. Both deliver stirring visual effects with maximum impact – at maximum speed.


Fast connections for high performance.

iMac is astonishingly thin. But it’s jam-packed with advanced technology. Two Thunderbolt 2 ports come standard on all iMac models and deliver blazing-fast data transfer for external drives and cameras. Four USB 3 ports give you plenty of options for connecting peripherals, including your printer, video devices, and more. And with ultrafast three-stream Wi-Fi and Bluetooth 4.0 wireless technology, you’re instantly connected to all your favorite content.

OS X El Capitan

The world’s most advanced desktop operating system.

OS X is what makes a Mac a Mac. Not only is it designed to be intuitive and easy to use, but it’s also engineered to take full advantage of the Retina display, so you’ll see everything on your desktop with stunning clarity. It features an incredible collection of apps you’ll use – and love – every day. And it’s designed to enable your Mac and iOS devices to work together in amazing ways.


Personal computer
Product Form Factor
Built-in Devices
Stereo speakers, 2 microphones
English / United States

Processor / Chipset

Intel Core i5 (5th Gen) 3.1 GHz
Max Turbo Speed
3.6 GHz
Number of Cores
Max CPU Qty
Processor Main Features
Intel Turbo Boost Technology 2

Cache Memory

Installed Size
L3 cache – 4 MB
Cache Per Processor
4 MB


Installed Size
8 GB
Effective Memory Speed
1867 MHz

Hard Drive

1 x 1 TB
Interface Type
SATA 3Gb/s
Spindle Speed
5400 rpm

Card Reader

Card reader
Supported Flash Memory Cards
SD Memory Card, SDHC Memory Card, SDXC Memory Card


Monitor Type
Diagonal Size
Native Resolution
4096 x 2304 ( 4K )
Widescreen Display
Monitor Features

Graphics Controller

Graphics Processor
Intel Iris Pro Graphics 6200

Audio Output

Sound Output Mode
Speakers Included
2 x right / left channel

Input Device

Mouse, keyboard


Keyboard Name
Apple Magic Keyboard
Localization & Layout


Mouse Name
Apple Magic Mouse 2

Audio Input

Two microphones


Wireless LAN Supported
Data Link Protocol
Ethernet, Fast Ethernet, Gigabit Ethernet, IEEE 802.11b, IEEE 802.11a, IEEE 802.11g, IEEE 802.11n, Bluetooth 4.0, IEEE 802.11ac
Compliant Standards
IEEE 802.11b, IEEE 802.11a, IEEE 802.11g, IEEE 802.11n, Bluetooth 4.0, IEEE 802.11ac

Expansion / Connectivity

2 x Thunderbolt 2 ¦ 4 x USB 3.0 ¦ 1 x LAN (Gigabit Ethernet) ¦ 1 x SPDIF output/headphones


Cables Included
Lightning to USB cable
Theft/Intrusion Protection
Security lock slot (cable lock sold separately)


Device Type
Power supply
Nominal Voltage
AC 120/230 V ( 50/60 Hz )

Operating System / Software

OS Provided
Apple OS X 10.12 Sierra
Apple iTunes, Apple Mac OS X Mail, Apple iPhoto, Apple iMovie, Apple Safari, Apple GarageBand, Apple Dashboard, Apple Spotlight, Photo Booth, Power Saver, Apple Time Machine, Apple FaceTime, Apple Mission Control, Apple Preview, Maps, Reminders, App Store, Contacts, Notes, Calendar, Apple AirDrop, Notification Center, Messages, Dictation, iCloud, Game Center, Apple AirPlay, Apple iBooks, Apple Keynote, Apple Pages, Apple Numbers, Facebook, Twitter, Family Sharing

Environmental Standards


Manufacturer Warranty

Service & Support
Limited warranty – 1 year ¦ Technical support – phone consulting – 90 days

Dimensions & Weight

20.8 in
6.9 in
17.7 in
12.52 lbs

Environmental Parameters

Min Operating Temperature
50 °F
Max Operating Temperature
95 °F
Humidity Range Operating
5 – 95% (non-condensing)

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