iMac (Retina 4K, 21.5-inch, 2017) – Technical Specifications Display. When you shell out a little more cash to take home a true 2019 21.5-inch iMac, the most glaring difference is its Retina 4K screen. This display more than doubles the base model’s horizontal and vertical resolution to 4,096 x 2,304 pixels – true 4K, not ‘UHD’.
Retina 4K display
21.5-inch (diagonal) Retina 4K display
4096-by-2304 resolution with support for one billion colors
500 nits brightness
Wide color (P3)
Processor – iMac (Retina 4K 21.5-inch
3.0GHz 3.0GHz quad‑core Intel Core i5 (Turbo Boost up to 3.5GHz) Configurable to 3.6GHz quad-core Intel Core i7 (Turbo Boost up to 4.2GHz)
3.4GHz 3.4GHz quad-core Intel Core i5 (Turbo Boost up to 3.8GHz) Configurable to 3.6GHz quad-core Intel Core i7 (Turbo Boost up to 4.2GHz)
Memory – iMac (Retina 4K 21.5-inch
3.0GHz 8GB of 2400MHz DDR4 memory Configurable to 16GB
3.4GHz 8GB of 2400MHz DDR4 memory Configurable to 16GB or 32GB
3.0GHz 1TB (5400-rpm) hard drive Configurable to 1TB Fusion Drive or 256GB or 512GB SSD
3.4GHz 1TB Fusion Drive Configurable to 256GB, 512GB, or 1TB SSD
3.0GHz Radeon Pro 555 with 2GB of VRAM
3.4GHz Radeon Pro 560 with 4GB of VRAM
Video Support and Camera
FaceTime HD camera
Simultaneously supports full native resolution on the built-in display at millions of colors (21.5-inch) or 1 billion colors (21.5-inch 4K) and:
One 5120‑by‑2880 (5K) external display at 60Hz with support for 1 billion colors, or
Two 3840-by-2160 (4K UHD) external displays at 60Hz with support for 1 billion colors, or
Two 4096‑by‑2304 (4K) external displays at 60Hz with support for millions of colors
Thunderbolt 3 digital video output
Native DisplayPort output over USB‑C
Thunderbolt 2, HDMI, DVI, and VGA output supported using adapters (sold separately)
3.5 mm headphone jack
Support for Apple iPhone headset with microphone
Connections and Expansion
3.5 mm headphone jack
SDXC card slot
Four USB 3 ports (compatible with USB 2)
Two Thunderbolt 3 (USB-C) ports with support for:
Thunderbolt (up to 40 Gbps)
USB 3.1 Gen 2 (up to 10 Gbps)
Thunderbolt 2, HDMI, DVI, and VGA supported using adapters (sold separately)
Magic Keyboard Magic Keyboard comes standard with your iMac. It’s wireless and rechargeable (so you won’t be replacing batteries), with an ultracompact, edge-to-edge design that wastes no surface space. It has a stable scissor mechanism, optimized key travel, and a low profile that provide control and comfort. And it pairs immediately with your iMac right out of the box.
Magic Keyboard with Numeric Keypad You get all the functionality of Magic Keyboard, with an extended layout that makes it even easier to work and play. The new Magic Keyboard with Numeric Keypad includes document navigation controls — page up, page down, home, and end — and full-size arrow keys that are perfect for navigating pro apps, moving through spreadsheets, and playing games.
Magic Mouse 2 Magic Mouse 2 comes standard with your iMac. The design of Magic Mouse 2 lets it glide smoothly across your desk. And since it supports Multi-Touch, you can use simple gestures on its surface to do things such as swipe between web pages and scroll through documents.
Magic Trackpad 2 If you prefer using a trackpad, Magic Trackpad 2 gives you the full range of Multi-Touch gestures and introduces Force Touch to the desktop. Sensors underneath the trackpad surface detect subtle differences in the amount of pressure you apply, bringing more functionality to your fingertips and enabling a deeper connection to your content. This design, along with a low profile, makes it extremely comfortable to use.
Operating temperature: 50° to 95° F (10° to 35° C)
Relative humidity: 5% to 95% noncondensing
Operating altitude: tested up to 10,000 feet
In the Box
21.5‑inch iMac with Retina 4K display
Magic Mouse 2
Lightning to USB Cable
macOS macOS is the operating system that powers everything you do on a Mac. macOS Mojave brings new features inspired by its most powerful users, but designed for everyone. So you can get more out of every click. Learn more
Accessibility features help people with disabilities get the most out of their new iMac. With built-in support for vision, hearing, physical and motor skills, and learning and literacy, you can create and do amazing things. Learn more
Apple takes a complete product life cycle approach to determining our environmental impact. Learn more
iMac is designed with the following features to reduce its environmental impact:
Arsenic-free display glass
Mercury-free LED-backlit display
Recyclable aluminum enclosure
Speaker enclosures made with 60 percent post‑consumer recycled plastic
Fan assembly made with 26 percent bio‑based plastic
Meets ENERGY STAR Version 6.1 requirements
Rated EPEAT Gold5
Apple and the Environment Learn more about Apple’s dedication to reducing the environmental impact of our products and process. Or read our Product Environmental Reports for detailed information on the environmental performance of every Apple product.
Apple GiveBack Letting go of your old Mac is easy with Apple GiveBack. If it’s in good shape, you can trade it in for Apple Store credit. If it’s not eligible for credit, we’ll recycle it responsibly at no cost to you. Good for you. Good for the planet. See how it works
Declared noise emission values in accordance with ECMA-109
Sound Power Level L W A,m (B)
Sound Pressure Level Operator Position L p A,m (dB)
2.0 (K V =0.3)
2.0 (K V =0.3)
Hard drive seek
2.0 (K V =0.3)
L W A,m is the mean A-weighted sound power level, rounded to the nearest 0.1 B.
L p A,m is the mean A-weighted sound pressure level measured at operator position (rounded to the nearest 1 dB).
1 B (bel) = 10 dB (decibel)
K v is the statistical adder for computing upper-limit of A-weighted sound power level.
The quantity, L W A,c (formerly called L W Ad) may be computed from the sum of L W A,m and K v .
The Wireless web test browses 25 popular websites.
Configuration tested: 3.4GHz quad-core Intel Core i5 processor, 8GB memory, 1TB hard drive, Radeon Pro 560 Graphics.
1GB = 1 billion bytes and 1TB = 1 trillion bytes; actual formatted capacity less.
Weight varies by configuration and manufacturing process.
iMovie, GarageBand, Pages, Numbers, and Keynote are available on the Mac App Store. Downloading apps requires an Apple ID and a device that is compatible with the OS version required for each app.
PVC-free AC power cord available in all regions except India and South Korea.
iMac achieved a Gold rating from EPEAT in the U.S. and Canada.
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