iMac (Retina 4K, 21.5-inch, 2019)

Quick look

Price: £1,249²launch price
Chip: Core i33.6GHz quad-core Intel
CPU: 4-coreCPU
GPU: Not available³GPU
Memory: 8GBmemory, base
Storage: 256GBstorage, base
Display: 21.5-inchdisplay
Released: 19 March 2019⁴Available online; Apple gave no in-store day
Security updates: Not available⁵Security updates

Each figure is from the source marked¹ unless it carries its own number.

Drawn to scale from the published dimensions below: the front face. Outline only — the corner radius, where the display sits in the face and the stand’s width are our drawing conventions, not measurements; the display rectangle is Apple’s diagonal at its aspect ratio.

Specifications

Body

Dimensions: 450 x 528 x 175 mm
Weight: 5.48 kg
Ports: Two Thunderbolt 3 (USB-C) ports, four USB-A ports, SDXC card slot, Gigabit Ethernet (RJ-45), 3.5 mm headphone jack
Thunderbolt ports: 2
Thunderbolt version: Thunderbolt 3
USB-A ports: 4
HDMI: No HDMI port.⁶
SD card slot: Yes
Headphone jack: Yes
Keyboard: Magic Keyboard
Touch ID: No Touch ID.⁶

Display

Display size: 21.5 in
Resolution: 4096 x 2304
Display type: Retina 4K display
Brightness: 500 nits
Wide colour (P3): Yes

Chip and memory

Chip: 3.6GHz quad-core Intel Core i3
Apple silicon: Intel processor, not Apple silicon.⁷
CPU cores: 4
Graphics: Radeon Pro 555X with 2GB of GDDR5 memory
Chip options: 3.6GHz quad-core Intel Core i3, 3.0GHz 6-core Intel Core i5, or 3.2GHz 6-core Intel Core i7
Memory (base): 8GB
Memory (maximum): 32GB
Memory options: 8GB, 16GB or 32GB
Memory upgradeable by user: No, as Apple documents⁸
Storage (base): 256GB
Storage (maximum): 1TB
Storage options: 256GB SSD or 1TB Fusion Drive

Connectivity

Wi-Fi: 802.11ac Wi-Fi
Bluetooth: 4.2
Ethernet: 10/100/1000BASE-T Gigabit Ethernet (RJ-45)
External displays (base): 2

Camera and audio

Camera: FaceTime HD camera
Speakers: Stereo speakers
Microphones: Microphone

Platform

Shipped with: macOS Mojave⁹
Newest macOS: macOS Sequoia¹⁰
Model identifier: iMac19,2¹⁰
Part numbers: MRT3xx/A, MRT4xx/A, MHK23xx/A¹¹
Model year: 2019

Benchmarks

Geekbench 7 (CPU, single-core): 1,169¹²
Geekbench 7 (CPU, multi-core): 3,336¹²

An iMac has no battery, so battery rows do not apply.

Software support

Feature updates until: Not available¹³
Security updates until: Not available¹³
Basis: our inference from history¹⁴

Previous and next model

Previous model

iMac (Retina 4K, 21.5-inch, 2017), June 2017

What changed

Weight: 5.66 kg iMac (Retina 4K, 21.5-inch, 2017)5.48 kg iMac (Retina 4K, 21.5-inch, 2019)
Ports: Two Thunderbolt 3 (USB-C) ports, four USB 3 ports, SDXC card slot, Gigabit Ethernet (RJ-45), 3.5 mm headphone jack iMac (Retina 4K, 21.5-inch, 2017)Two Thunderbolt 3 (USB-C) ports, four USB-A ports, SDXC card slot, Gigabit Ethernet (RJ-45), 3.5 mm headphone jack iMac (Retina 4K, 21.5-inch, 2019)
Chip: 3.0GHz quad-core Intel Core i5 iMac (Retina 4K, 21.5-inch, 2017)3.6GHz quad-core Intel Core i3 iMac (Retina 4K, 21.5-inch, 2019)
Storage (base): 1TB iMac (Retina 4K, 21.5-inch, 2017)256GB iMac (Retina 4K, 21.5-inch, 2019)

Full comparison

Comparisons

Against its own line

Against the rest of the range

Compare it with any other Mac

Sources

Apple Support (UK) — iMac (Retina 4K, 21.5-inch, 2019) - Technical Specifications · Default for iMac (Retina 4K, 21.5-inch, 2019) · Apple’s figure · read 15 Sep 2026
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Apple Newsroom (UK) — iMac gets a 2x performance boost · Apple’s figure · read 15 Sep 2026
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Not published by Apple. Pages checked: Apple Support (UK) — iMac (Retina 4K, 21.5-inch, 2019) - Technical Specifications; Apple Support (UK) — Identify your iMac model; Apple Newsroom (UK) — iMac gets a 2x performance boost. Read 9 Oct 2026
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Apple Newsroom (UK) — iMac gets a 2x performance boost · Apple’s figure · read 22 Sep 2026
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Security updates: no end date published. Checked: endoflife.date. Read 22 Sep 2026
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No HDMI port. No Touch ID. Checked: Apple Support (UK) — iMac (Retina 4K, 21.5-inch, 2019) - Technical Specifications. Read 9 Oct 2026
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Intel processor, not Apple silicon. Checked: Apple Support (UK) — iMac (Retina 4K, 21.5-inch, 2019) - Technical Specifications. Read 15 Sep 2026
↩
Apple Support (UK) — Install memory in an iMac · Apple’s figure · read 18 Oct 2026
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Apple Newsroom (UK) — iMac gets a 2x performance boost · Apple’s figure · read 9 Oct 2026
↩
Apple Support (UK) — Identify your iMac model · Apple’s figure · read 15 Sep 2026
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Apple Support (UK) — Identify your iMac model · Apple’s figure · read 18 Oct 2026
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Geekbench Browser (Primate Labs) · third-party figure · read 11 Oct 2026
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Feature and security updates: end dates not published by Apple. Checked: endoflife.date. Read 22 Sep 2026
↩
The newest macOS Apple lists this Mac for is macOS Sequoia; Apple’s macOS 27 Golden Gate list does not name it. endoflife.date shows Sequoia still receiving security updates on 22 September 2026. Apple’s habit of patching the two releases before the newest points to those updates ending around autumn 2027; that is an inference, not a commitment. Source: endoflife.date. Read 22 Sep 2026
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Not published by Apple

iMac (Retina 4K, 21.5-inch, 2019). Apple doesn’t publish for this Mac: colours, pixel density, refresh rate, nano-texture option, GPU cores, storage upgradeable by user, maximum continuous power. Geekbench 7 Metal: the Mac chart has no Metal score for this Mac (chart read 10 Oct 2026). Pages checked: Apple Support (UK) — iMac (Retina 4K, 21.5-inch, 2019) - Technical Specifications; Apple Support (UK) — Identify your iMac model; Apple Newsroom (UK) — iMac gets a 2x performance boost, read 9 Oct 2026.