Apple iMac (Retina 5K, 27-inch, 2020) vs Apple iMac (Retina 5K, 27-inch, Mid 2015)

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iMac (Retina 5K, 27-inch, 2020) compared with iMac (Retina 5K, 27-inch, Mid 2015)

	AppleiMac (Retina 5K, 27-inch, 2020)	AppleiMac (Retina 5K, 27-inch, Mid 2015)
Overview
Released
Released	August 2020	May 2015
Performance
Processor
Processor	Intel Core i5-10500, Intel Core i5-10600, Intel Core i9-10910 or Intel Core i7-10700K	Intel Core i5-4590
CPU cores
CPU cores	6, 8 or 10	4
CPU threads
CPU threads	12, 16 or 20	4
Graphics
Graphics	Radeon Pro 5300 (4 GB GDDR6), Radeon Pro 5500 XT (8 GB GDDR6), Radeon Pro 5700 (8 GB GDDR6) or Radeon Pro 5700 XT (16 GB GDDR6)	AMD Radeon R9 M290 (2 GB GDDR5)
Memory
Memory	8 GB, 16 GB, 32 GB, 64 GB or 128 GB (better)	8 GB, 16 GB or 32 GB
Storage
Storage	256 GB to 8 TB (better)	256 GB to 3 TB
CPU
CPU	Six-core Core i5 at 3.1 GHz (Turbo Boost 4.5 GHz) or 3.3 GHz (4.8 GHz), or eight-core Core i7 at 3.8 GHz (5.0 GHz). Upper two bases configurable to 3.6 GHz ten-core Core i9 (5.0 GHz). Exact CPU identities follow Geekbench. Apple specifies a 5.0 GHz Core i7 limit in this iMac, while Intel lists 5.1 GHz for the chip itself.	Fixed 3.3 GHz quad-core Intel Core i5-4590 with Turbo Boost up to 3.7 GHz; exact chip identified in Macworld and The Register's tests. Apple's configure-to-order section is headed 3.5 GHz and repeats options from the higher model; those processor options are excluded from this entry.
GPU
GPU	Radeon Pro 5300 with 4 GB GDDR6 on the two Core i5 bases. Upper base has Radeon Pro 5500 XT with 8 GB GDDR6, optionally Radeon Pro 5700 with 8 GB or 5700 XT with 16 GB GDDR6.	AMD Radeon R9 M290 with 2 GB GDDR5; the higher model's M290X and optional M295X are outside this configuration
Memory type
Memory type	2666 MHz DDR4; 8 GB standard as two 4 GB modules. Four user-accessible SO-DIMM slots; configurable to 16/32/64/128 GB on every base.	1600 MHz DDR3; 8 GB (two 4 GB modules), configurable to 16 GB or 32 GB; four user-accessible SO-DIMM slots
Storage type
Storage type	Lower base: fixed 256 GB SSD. Middle base: 512 GB/1/2 TB SSD. Upper base: 512 GB/1/2/4/8 TB SSD.	1 TB 7200-rpm hard drive, configurable to 3 TB hard drive, 1 TB or 3 TB Fusion Drive, or 256 GB, 512 GB or 1 TB flash storage (SSD)
Display
Screen size
Screen size	27″	27″
Resolution
Resolution	5120 × 2880	5120 × 2880
Panel
Panel	IPS LCD	IPS LCD
Brightness
Brightness	500 nits	–
Display type
Display type	LED-backlit Retina 5K display; IPS panel confirmed by EveryMac. Apple does not publish native refresh rate in the specification sheet.	27-inch Retina 5K display with IPS technology and support for millions of colours
Display features
Display features	Wide colour (P3), one billion colours and True Tone; standard glass or optional nano-texture glass	–
Connections
Ports
Ports	2 × Thunderbolt 3, 4 × USB-A, SD card slot, Ethernet, headphone jack	2 × Thunderbolt 2, 4 × USB-A, SD card slot, Ethernet, headphone jack
Ethernet
Ethernet	1 Gb/s	1 Gb/s
External displays
External displays	Up to 2 (better)	Up to 1
Wi-Fi
Wi-Fi	802.11ac	802.11ac
Bluetooth
Bluetooth	5.0	4.0
Camera
Camera	1080p FaceTime HD	FaceTime HD
Back ports
Back ports	Four USB-A ports; two Thunderbolt 3 USB-C ports with DisplayPort, Thunderbolt up to 40 Gb/s and USB 3.1 Gen 2 up to 10 Gb/s; UHS-II SDXC, Gigabit Ethernet and 3.5 mm headphone jack; Kensington lock slot. Optional 10Gb Ethernet supports 1/2.5/5/10Gb connections. Thunderbolt 2, HDMI, DVI and VGA require adapters.	Four USB 3 ports, two Thunderbolt 2 ports with Mini DisplayPort output, SDXC card slot, Gigabit Ethernet, headphone and optical digital audio output; Kensington lock slot. DVI, VGA and dual-link DVI require separately sold adapters.
External displays
External displays	One 6K or 5K external display, or two 4K displays; two 6K displays require Radeon Pro 5700 or 5700 XT. All listed external modes run at 60 Hz.	Built-in display at native resolution alongside one external display up to 3840 × 2160; extended desktop and video mirroring
Speakers
Speakers	Stereo speakers	Stereo speakers; supports Apple iPhone headset with microphone
Microphones
Microphones	Three-mic array with directional beamforming; supports Hey Siri	Dual microphones
Keyboard and mouse
Keyboard and mouse	Rechargeable Magic Keyboard and Magic Mouse 2; optional numeric keyboard and Magic Trackpad	Apple Wireless Keyboard and Magic Mouse; optional Magic Trackpad
Design and power
Type
Type	All-in-one	All-in-one
Weight
Weight	8.92 kg (better)	9.54 kg
Width × depth × height
Width × depth × height	650 × 203 × 516 mm	650 × 203 × 516 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 also available.	Dimensions include the stand; weight varies by configuration and manufacturing process. A built-in VESA mount version was also available.
Power supply
Power supply	100–240 V AC, 50–60 Hz, single phase	100–240 V AC, 50–60 Hz, single phase
Materials
Materials	Recyclable, low-carbon aluminium enclosure; arsenic-free glass and mercury-free LED backlight	Recyclable aluminium and glass enclosure; arsenic-free display glass and mercury-free LED backlight
In the box
In the box	iMac, Magic Keyboard, Magic Mouse 2, power lead, Lightning to USB cable and polishing cloth	iMac with Retina 5K display, Apple Wireless Keyboard, Magic Mouse and power lead; OS X Yosemite