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Apple 27-inch iMac (2019): No new ground, but welcome CPU and GPU upgrades

  • Editors' rating
    8.5 Excellent
  • $1,699.00


  • 6-core CPUs now standard
  • Improved GPU performance
  • Extensive BTO options


  • Expensive
  • Limited expansion and repair options
  • Only 8GB of RAM and Fusion drives as standard
Apple 27-inch iMac (2019): The ZDNet verdict

Hardware normally takes centre stage at Apple's big keynote events, but the recent unveiling of Apple News+, TV+ and Apple Card services overshadowed a number of significant hardware updates. Along with new versions of the iPad Air and iPad Mini, and the second-generation wire-free AirPods, the veteran iMac also received its first major update since June 2017.

This year's iMac is essentially a 'speed bump' that brings it up to date with the latest Intel processors. However, Apple's recent discovery of VR and AR has also prompted it to improve the iMac's graphics performance, resulting in what it claims is 'a 2x performance boost' over previous generations. That will be music to the ears of Apple's professional and creative users, who need a fast machine for graphics or video work, but who can't afford the eye-watering price of the iMac Pro that was also launched in 2017 (and recently updated).


Apple has upgraded the 27-inch and 21.5-inch iMacs with new processor and graphics options.

Image: Apple

Design & features

The external design of the 27-inch iMac hasn't changed for this 2019 update, and its 5K display remains the iMac's crowning glory (especially considering the cost of standalone 5K displays). The 5,120-by-2,880 resolution (217.6dpi) is pinpoint sharp and vibrantly colourful. It's practical too, as it allows video editors to work with 4K video at full size on-screen, while still providing some additional space for the complex menus and tool palettes used in various editing programs.


Ports on the 2019 iMac (L to R): headphone, SD card, 4x USB 3, 2x Thunderbolt 3 (USB-C), Gigabit Ethernet.

Image: Apple

Other features, such as the two Thunderbolt 3 ports, four USB 3.0, and Apple's wireless mouse and keyboard remain unchanged. One odd omission, though, is the lack of the T2 'security chip' that Apple has used in most of its recent releases, including the new Mac Mini – Apple's most affordable Mac. Admittedly, the days when the iMac was presented by Apple as an affordable home computer are long gone, but the recently revamped Mac Mini now fills that gap in the Mac range quite impressively, as well as providing a less expensive option for business users who might prefer a more modest or affordable display.

Pricing & options

The real change with the 2019 27-inch iMac arrives in the form of new CPU and GPU options. As with previous generations, the 2019 edition of the 27-inch iMac offers three standard configurations, with prices unchanged since 2017. However, all three configurations have replaced their quad-core, 7th generation Intel processors with new, six-core chips that offer a significant performance boost.

Pricing starts at £1,749 (inc. VAT; £1,457.50 ex. VAT, or $1,799) for a model with a six-core 8th generation processor running at 3.0GHz (with TurboBoost to 4.1GHz), along with 8GB of RAM, a 1TB hybrid Fusion drive and a new Radeon Pro 570X graphics card with 4GB of video memory. The mid-range model takes a modest step up to 3.1GHz (4.3GHz with TurboBoost) and a 4GB Radeon Pro 575X for £1,949 (inc. VAT; £1,624.17 ex. VAT, or $1,999).

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The third configuration offers a more significant upgrade, adopting a 9th generation six-core processor for the first time in the iMac range, increasing the Fusion drive to 2TB, and adding a Radeon Pro 580X with a full 8GB of video memory. The odd thing about Apple's pricing is that it's actually the more expensive, high-end models that offer better value for money, although the miserly 8GB of RAM and Fusion drives used in all three standard configurations models remain annoying – especially given the costs of Apple's memory and storage upgrades.

Thankfully, the 27-inch version of the iMac does still allow you to open a small panel on the back of the display in order to install additional RAM, up to a maximum of 64GB (an option not available on the 21.5-inch model). That, however, remains the only option for user upgrades and repairs, with a conspicuous void continuing to hover over Apple's plans for a more upgradeable Mac Pro revamp.


There's still a clear line drawn between the Core processors used in the iMac, and the Xeon-based iMac Pro, but the 2019 iMac also offers a number of build-to-order upgrades at the time of purchase, and we were able to test the iMac with its top-of-the-range options, including an eight-core, 9th generation Core i9-9900K processor, Radeon Pro Vega 48 (8GB), and 512GB solid-state drive, which comes to a rather imposing total of £3,284 (inc. VAT; £2,736.67 ex. VAT, or $3,449). Even so, that's still far less than the iMac Pro, which starts at an eye-watering 'entry-level' price of £4,899 inc.VAT; £4,082.50 ex. VAT, or $4,999).

A closer look at Apple's claim of 2x performance boost reveals that this figure is averaged out over a number of tests conducted by Apple, but the build-to-order configuration we tested does still provide a real challenge to the iMac Pro.

The raw processor performance of Intel's 9th generation chip is certainly impressive, with the 2019 iMac achieving Geekbench 4 scores of 6395 for single-core performance and 33,700 for multi-core. That gives it a slight edge over the entry-level version of the 2017 iMac Pro we tested, which managed a single-core score of 5,134, and multi-core score of 31,400.

The current R20 version of Cinebench abandons GPU tests, although the older R15 release scores the iMac at an impressive 162fps, compared to 120fps for the iMac Pro, and 99.5fps for the 2017 edition of the iMac. The Unigine Valley graphics benchmark produces a more modest result when running its Extreme HD settings, but still manages a very respectable 54.8fps. Even the Fusion drive performs well, given that it's a hybrid HD/SSD device, recording read and write speeds of 2,864MB/s and 1,885MB/s respectively.


Image: Apple


The overlap between the iMac and iMac Pro ranges is a little puzzling, but the improved performance of the 2019 iMac will be welcomed by owners of older Mac models who have eyed the iMac Pro with envy and empty pockets. The iMac Pro – with up to 18 cores in its Xeon processor – will still be more adept at workstation-level tasks, such as 3D animation or editing multiple streams of 4K video. But for many professional users in fields such as video, design and audio, the 2019 edition of the standard 27-inch iMac will be a very welcome upgrade.

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Desktop type All-in-one desktop system
Type Personal computer
Product Form Factor All-in-one
Packaged Quantity 1
Built-in Devices microphone, stereo speakers
Processor / Chipset
CPU Intel Core i5 (8th Gen) 3 GHz
Max Turbo Speed 4.1 GHz
Number of Cores 6-core
Processor Main Features Intel Turbo Boost Technology
Installed Size 8 GB / 64 GB (max)
Technology DDR4 SDRAM
Memory Speed 2666 MHz
Configuration Features 2 x 4 GB
Technology DDR4 SDRAM
Installed Size 8 GB
Max Supported Size 64 GB
Form Factor SO-DIMM 260-pin
Slots Qty 4
Empty Slots 2
Environmental Parameters
Humidity Range Operating 5 - 95% (non-condensing)
Min Operating Temperature 50 °F
Max Operating Temperature 95 °F
Widescreen Display Yes
Monitor Features LED-backlit, Wide Color Gamut
Type LED
TFT Technology IPS
Diagonal Size (metric) 68.6 cm
Display Resolution Abbreviation 5K
Hard Drive
Features Fusion Drive
Type Hybrid Drive
Installed Qty 1
Capacity 1 TB
Type keyboard, mouse
Localization & Layout English
Wireless Protocol 802.11a/b/g/n/ac, Bluetooth 4.2
Hard Drive (3rd)
Type none
Optical Storage
Drive Type no optical drive
Type none
Installed Qty 1
Max Supported Qty 1
Type Core i5
Generation 8
Manufacturer Intel
Clock Speed 3 GHz
Card Reader
Type card reader
Supported Flash Memory Cards SD Memory Card, SDHC Memory Card, SDXC Memory Card
Storage Removable
Type none
Brand Apple
Product Line Apple iMac
Model with Retina 5K display
Localization English
Country Kits United States
Packaged Quantity 1
Data Link Protocol Bluetooth 4.2, Ethernet, Fast Ethernet, Gigabit Ethernet, IEEE 802.11a, IEEE 802.11ac, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n
Compliant Standards Bluetooth 4.2, IEEE 802.11a, IEEE 802.11ac, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n
Wireless LAN Supported Yes
Compliant Standards BFR-free, PVC-free
Security Slot Type Kensington security slot
Type personal computer
Hard Drive Capacity 1 TB
Monitor Type LED - IPS
Native Resolution 5120 x 2880 (5K)
Diagonal Size 27 in
Image Brightness 500 cd/m2
Dimensions & Weight
Width 25.6 in
Depth 8 in
Height 20.3 in
Form Factor all-in-one
Manufacturer Form Factor all-in-one
Built-in Devices microphone, stereo speakers
Graphics Controller
Graphics Processor AMD Radeon Pro 570X
Video Memory 4 GB GDDR5 SDRAM
Manufacturer Warranty
Type 1 year warranty
Audio Output
Sound Output Mode stereo
Keyboard Name Apple Magic Keyboard
Connectivity wireless
Interface Bluetooth
Type none
Environmental Standards
ENERGY STAR Certified Yes
Audio Input
Type Microphone
Mouse Name Apple Magic Mouse 2
Connectivity wireless
Technology laser
Interface Bluetooth
Features Multi-Touch
Physical Characteristics
Form Factor all-in-one
Weight 20.77 lbs
Type power supply
Voltage Required AC 100-240 V
Min Operating Temperature 50 °F
Max Operating Temperature 95 °F
Operating System / Software
OS Provided Apple macOS Big Sur 11.0
Type App Store, Apple AirDrop, Apple AirPlay, Apple Dashboard, Apple FaceTime, Apple GarageBand, Apple Keynote, Apple Mac OS X Mail, Apple Mission Control, Apple Numbers, Apple Pages, Apple Preview, Apple Safari, Apple Spotlight, Apple Time Machine, Apple iBooks, Apple iMovie, Apple iPhoto, Apple iTunes, Calendar, Contacts, Dictation, Facebook, Family Sharing, Game Center, Maps, Messages, Notes, Notification Center, Photo Booth, Power Saver, Reminders, Twitter, iCloud
Video Output
Graphics Processor Series AMD Radeon Pro
Video Memory
Technology GDDR5 SDRAM
Installed Size 4 GB
Service & Support
Type 1 year warranty
Service & Support Details
Type limited warranty, technical support
Service Included phone consulting
Full Contract Period 1 year, 90 days