Apple iMac (21.5-inch, 2017) vs Apple iMac 24″ (M1)

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iMac (21.5-inch, 2017) compared with iMac 24″ (M1)

	AppleiMac (21.5-inch, 2017)	AppleiMac 24″ (M1)
Overview
Released
Released	June 2017	May 2021
Performance
Processor
Processor	Intel Core i5-7360U	Apple M1
CPU cores
CPU cores	2	8
CPU threads
CPU threads	4	–
Graphics
Graphics	Intel Iris Plus Graphics 640	7-core GPU or 8-core GPU
Memory
Memory	8 GB or 16 GB	8 GB or 16 GB
Storage
Storage	256 GB to 1 TB	256 GB to 2 TB (better)
CPU
CPU	2.3 GHz dual-core Intel Core i5 with Turbo Boost up to 3.6 GHz; Geekbench identifies the exact processor as Core i5-7360U	8-core CPU with 4 performance cores and 4 efficiency cores
GPU
GPU	Intel Iris Plus Graphics 640; no discrete graphics option	7-core GPU in the two-port model; 8-core GPU in the four-port model
AI engine
AI engine	–	16-core Neural Engine
Memory type
Memory type	8 GB of 2133 MHz DDR4, configurable to 16 GB	–
Storage type
Storage type	1 TB 5400-rpm hard drive, configurable to 1 TB Fusion Drive or 256 GB SSD	SSD; two-port model configurable to 512 GB or 1 TB, four-port model to 512 GB, 1 TB or 2 TB
Display
Screen size
Screen size	21.5″	24″
Resolution
Resolution	1920 × 1080	4480 × 2520 (better)
Panel
Panel	–	IPS LCD
Refresh rate
Refresh rate	–	60 Hz
Brightness
Brightness	–	500 nits
Display type
Display type	21.5-inch LED-backlit display; 1920 × 1080 with support for millions of colours. Apple does not identify the panel technology, native refresh rate or brightness in its specification sheet; Retina model display figures do not apply.	4.5K Retina display; actual diagonal 23.5 inches; IPS panel and 60 Hz refresh rate confirmed by Notebookcheck
Pixel density
Pixel density	–	218 ppi
Display features
Display features	–	1 billion colours; wide colour (P3); True Tone; anti-reflective coating
Connections
Ports
Ports	2 × Thunderbolt 3, 4 × USB-A, SD card slot, Ethernet, headphone jack	2 × USB4, headphone jack
Ethernet
Ethernet	1 Gb/s	–
External displays
External displays	Up to 2 (better)	Up to 1
Wi-Fi
Wi-Fi	802.11ac	Wi-Fi 6
Bluetooth
Bluetooth	4.2	5.0
Camera
Camera	FaceTime HD	1080p FaceTime HD
Back ports
Back ports	Four USB-A ports, two Thunderbolt 3 (USB-C) ports, SDXC card slot, Gigabit Ethernet, 3.5 mm headphone jack and Kensington lock slot. Thunderbolt 3 supports DisplayPort, up to 40 Gb/s Thunderbolt and up to 10 Gb/s USB 3.1 Gen 2; Thunderbolt 2, HDMI, DVI and VGA require adapters.	Two-port model: two Thunderbolt / USB 4 ports with DisplayPort, Thunderbolt 3 and USB 4 up to 40 Gb/s, and USB 3.1 Gen 2 up to 10 Gb/s; optional Gigabit Ethernet. Four-port model adds two USB 3 ports up to 10 Gb/s and includes Gigabit Ethernet. Both have a 3.5 mm headphone jack.
External displays
External displays	Built-in display at native resolution alongside one 5120 × 2880 display at 60 Hz with one billion colours, two 3840 × 2160 displays at 60 Hz with one billion colours, or two 4096 × 2304 displays at 60 Hz with millions of colours	One external display up to 6K 60 Hz, alongside the built-in display at full resolution
Camera
Camera	–	1080p FaceTime HD camera; advanced image signal processor with computational video
Speakers
Speakers	Stereo speakers; supports Apple iPhone headset with microphone	High-fidelity six-speaker system with force-cancelling woofers; wide stereo sound; spatial audio with Dolby Atmos
Microphones
Microphones	Built-in microphone	Studio-quality three-mic array with high signal-to-noise ratio and directional beamforming; Hey Siri
Keyboard and mouse
Keyboard and mouse	Magic Keyboard, Magic Mouse, Lightning to USB cable and polishing cloth; configurable with Magic Keyboard with Numeric Keypad or Magic Trackpad	Magic Mouse and Magic Keyboard; keyboard has Touch ID on the four-port model and optionally on the two-port model; Magic Trackpad and Magic Keyboard with Touch ID and Numeric Keypad available instead
Design and power
Type
Type	All-in-one	All-in-one
Weight
Weight	5.44 kg	4.46 kg (better)
Width × depth × height
Width × depth × height	528 × 175 × 450 mm	547 × 147 × 461 mm
Operating system
Operating system	macOS	macOS
Size and weight detail
Size and weight detail	Dimensions include the stand; weight varies by configuration and manufacturing process. A built-in VESA mount version was available.	–
Power supply
Power supply	100–240 V AC, 50–60 Hz, single phase	143 W external power adapter with magnetic connection; Gigabit Ethernet built into the adapter where fitted
Noise
Noise	Apple reports operator-position sound pressure of 11 dB at idle and during wireless web, and 12 dB during hard-drive seek, tested on the Core i5 with 8 GB memory and 1 TB hard drive	7 dBA sound pressure at idle and during Apple's wireless web test (operator position)
Materials
Materials	Aluminium enclosure; arsenic-free display glass; mercury-, BFR- and beryllium-free with regional exceptions for PVC-free power leads	Recyclable, low-carbon aluminium enclosure
Colours
Colours	–	Two-port model: Blue, Green, Pink, Silver. Four-port model also comes in Yellow, Orange and Purple.
In the box
In the box	iMac, Magic Keyboard, Magic Mouse, Lightning to USB cable, polishing cloth and power lead. Apple's current support page describes the later macOS Big Sur release.	iMac, Magic Keyboard, Magic Mouse, 143 W power adapter, 2 m power lead, USB-C to Lightning cable