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Should I upgrade my iMac (Retina 5K, 27-inch, 2020)?

6 years old · Not on the current macOS; last is macOS Tahoe 26

Quick look

Price
£1,7992launch price
Chip
Core i53.1GHz 6-core 10th-generation Intel
CPU
6-coreCPU
GPU
Not available3GPU
Memory
8GBmemory, base
Storage
256GBstorage, base
Display
27-inchdisplay
Released
4 August 20204Available 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.

Software support

Security updates
Not available5
macOS
macOS Tahoe 26, not the current macOSThe iMac (Retina 5K, 27-inch, 2020) is not on the current macOS (macOS 27 Golden Gate); the newest it runs is macOS Tahoe 26. Apple has historically shipped security updates to the two releases before the newest, which would put the end of its updates around autumn 2028; that is Apple’s past pattern, not a commitment.

No newer Mac with a store price we hold

We hold no Apple UK store price for any Mac in the iMac 27-inch line, so this page names no newer Mac to set the iMac (Retina 5K, 27-inch, 2020) against. That is a gap in what we hold, not a statement about what Apple sells.

Specifications

Body

Dimensions
516 x 650 x 203 mm
Weight
8.92 kg
Ports
Two Thunderbolt 3 (USB-C) ports, four USB-A ports, SDXC card slot (UHS-II), 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
27 in
Resolution
5120 x 2880
Display type
5K Retina display
Brightness
500 nits
Wide colour (P3)
Yes
Nano-texture option
Yes

Chip and memory

Chip
3.1GHz 6-core 10th-generation Intel Core i5
Apple silicon
Intel processor, not Apple silicon.7
CPU cores
6
Graphics
AMD Radeon Pro 5300 with 4GB of GDDR6 memory
Chip options
3.1GHz 6-core Intel Core i5, 3.3GHz 6-core Intel Core i5, 3.8GHz 8-core Intel Core i7, or 3.6GHz 10-core Intel Core i9
Memory (base)
8GB
Memory (maximum)
128GB
Memory options
8GB, 16GB, 32GB, 64GB or 128GB
Memory upgradeable by user
Yes, as Apple documents8
Storage (base)
256GB
Storage (maximum)
8TB
Storage options
256GB, 512GB, 1TB, 2TB, 4TB or 8TB SSD

Connectivity

Wi-Fi
802.11ac Wi-Fi
Bluetooth
5.0
Ethernet
10/100/1000BASE-T Gigabit Ethernet (RJ-45); configurable to 10Gb Ethernet
External displays (base)
2

Camera and audio

Camera
1080p FaceTime HD camera
Speakers
Stereo speakers
Microphones
Studio-quality three-mic array with high signal-to-noise ratio and directional beamforming

Platform

Newest macOS
macOS Tahoe 269
Model identifier
iMac20,1 or iMac20,210
Part numbers
MXWT2xx/A, MXWU2xx/A, MXWV2xx/A11
Model year
2020

Benchmarks

Geekbench 7 (CPU, single-core)
1,45512
Geekbench 7 (CPU, multi-core)
6,31912

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

Software support

Feature updates until
Not available5
Security updates until
Not available5
Basis
our inference from history13

Trade-in and used prices

No used or trade-in figures for the iMac (Retina 5K, 27-inch, 2020): we have not matched it to a CeX listing we can confirm is this exact Mac, and we would rather show nothing than a near miss.

More

Sources

  1. Apple Support (UK) — iMac (Retina 5K, 27-inch, 2020) - Technical Specifications · Default for iMac (Retina 5K, 27-inch, 2020) · Apple’s figure · read 15 Sep 2026

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  2. Apple Newsroom (UK) — 27-inch iMac gets a major update · Apple’s figure · read 15 Sep 2026

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  3. Not published by Apple. Pages checked: Apple Support (UK) — iMac (Retina 5K, 27-inch, 2020) - Technical Specifications; Apple Support (UK) — Identify your iMac model; Apple Newsroom (UK) — 27-inch iMac gets a major update. Read 9 Oct 2026

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  4. Apple Newsroom (UK) — 27-inch iMac gets a major update · Apple’s figure · read 22 Sep 2026

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  5. Apple publishes no date for the end of updates, and this site does not guess one. Checked: endoflife.date. Read 22 Sep 2026

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  6. No HDMI port. No Touch ID. Checked: Apple Support (UK) — iMac (Retina 5K, 27-inch, 2020) - Technical Specifications. Read 9 Oct 2026

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  7. Intel processor, not Apple silicon. Checked: Apple Support (UK) — iMac (Retina 5K, 27-inch, 2020) - Technical Specifications. Read 15 Sep 2026

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  8. Apple Support (UK) — Install memory in an iMac · Apple’s figure · read 18 Oct 2026

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  9. Apple Support (UK) — macOS Tahoe 26 is compatible with these computers · Apple’s figure · read 22 Sep 2026

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  10. Apple Support (UK) — Identify your iMac model · Apple’s figure · read 15 Sep 2026

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  11. Apple Support (UK) — Identify your iMac model · Apple’s figure · read 18 Oct 2026

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  12. Geekbench Browser (Primate Labs) · third-party figure · read 11 Oct 2026

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  13. The newest macOS Apple lists this Mac for is macOS Tahoe 26; Apple’s macOS 27 Golden Gate list does not name it. endoflife.date shows Tahoe 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 2028; that is an inference, not a commitment. Source: endoflife.date. Read 22 Sep 2026

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Not published by Apple

iMac (Retina 5K, 27-inch, 2020). Apple doesn’t publish for this Mac: colours, pixel density, refresh rate, GPU cores, storage upgradeable by user, maximum continuous power, the macOS it shipped with. 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 5K, 27-inch, 2020) - Technical Specifications; Apple Support (UK) — Identify your iMac model; Apple Newsroom (UK) — 27-inch iMac gets a major update, read 9 Oct 2026.

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