Apple iMac Pro (2017) vs Apple iMac (Retina 4K, 21.5-inch, 2017)

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iMac Pro (2017) compared with iMac (Retina 4K, 21.5-inch, 2017)

	AppleiMac Pro (2017)	AppleiMac (Retina 4K, 21.5-inch, 2017)
Overview
Released
Released	December 2017	June 2017
Performance
Processor
Processor	Intel Xeon W-2140B, Intel Xeon W-2150B, Intel Xeon W-2170B or Intel Xeon W-2191B	Intel Core i5-7400, Intel Core i7-7700 or Intel Core i5-7500
CPU cores
CPU cores	8, 10, 14 or 18	4
CPU threads
CPU threads	–	4 or 8
Graphics
Graphics	Radeon Pro Vega 56 (8 GB HBM2), Radeon Pro Vega 64 (16 GB HBM2) or Radeon Pro Vega 64X (16 GB HBM2)	Radeon Pro 555 (2 GB VRAM) or Radeon Pro 560 (4 GB VRAM)
Memory
Memory	32 GB, 64 GB, 128 GB or 256 GB (better)	8 GB, 16 GB or 32 GB
Storage
Storage	1 TB to 4 TB (better)	256 GB to 1 TB
CPU
CPU	Xeon W at 3.2 GHz with 8 cores (Turbo Boost 4.2 GHz), 3.0 GHz with 10 cores (4.5 GHz), 2.5 GHz with 14 cores (4.3 GHz) or 2.3 GHz with 18 cores (4.3 GHz). Exact W-B CPU identities follow Geekbench. The 8/10-core versions launched first; Macworld reports later January 2018 availability for 14/18-core options. Apple changed the standard configuration to 10 cores in August 2020.	3.0 GHz quad-core Core i5 with Turbo Boost up to 3.5 GHz, or 3.4 GHz quad-core Core i5 with Turbo Boost up to 3.8 GHz; both configurable to 3.6 GHz quad-core Core i7 with Turbo Boost up to 4.2 GHz
GPU
GPU	Radeon Pro Vega 56 with 8 GB HBM2, optionally Vega 64 or Vega 64X with 16 GB HBM2. Vega 64X is a later option included in Apple’s current specification sheet, absent from the launch reviews.	Radeon Pro 555 with 2 GB VRAM in the 3.0 GHz base; Radeon Pro 560 with 4 GB VRAM in the 3.4 GHz base
Memory type
Memory type	Quad-channel 2666 MHz DDR4 ECC; 32 GB standard, configurable to 64/128/256 GB. The current maker sheet includes the later 256 GB option; launch reviews cover up to 128 GB. No user-accessible memory door.	2400 MHz DDR4; 8 GB standard, configurable to 16 GB in the lower base or 16/32 GB in the upper base. Two SO-DIMM slots require removal of the glued display and logic board to access (iFixit).
Storage type
Storage type	1 TB SSD, configurable to 2 or 4 TB	Lower base: 1 TB 5400-rpm hard drive, 1 TB Fusion Drive or 256/512 GB SSD. Upper base: 1 TB Fusion Drive or 256/512 GB/1 TB SSD.
Display
Screen size
Screen size	27″	21.5″
Resolution
Resolution	5120 × 2880 (better)	4096 × 2304
Panel
Panel	IPS LCD	IPS LCD
Brightness
Brightness	500 nits	500 nits
Display type
Display type	LED-backlit Retina 5K display; IPS panel confirmed by EveryMac. Native refresh rate omitted because Apple does not publish it in the specification sheet.	LED-backlit Retina 4K display; IPS panel confirmed by EveryMac; Apple does not publish native refresh rate in this model’s specification sheet
Display features
Display features	Wide colour (P3); supports one billion colours	Wide colour (P3); supports one billion colours
Connections
Ports
Ports	4 × Thunderbolt 3, 4 × USB-A, SD card slot, Ethernet, headphone jack	2 × Thunderbolt 3, 4 × USB-A, SD card slot, Ethernet, headphone jack
Ethernet
Ethernet	10 Gb/s (better)	1 Gb/s
External displays
External displays	Up to 4 (better)	Up to 2
Wi-Fi
Wi-Fi	802.11ac	802.11ac
Bluetooth
Bluetooth	5.0	4.2
Camera
Camera	1080p FaceTime HD	FaceTime HD
Back ports
Back ports	Four USB-A ports; four Thunderbolt 3 USB-C ports with DisplayPort 1.2, Thunderbolt up to 40 Gb/s and USB 3.1 Gen 2 up to 10 Gb/s; UHS-II SDXC, Nbase-T Ethernet supporting 1/2.5/5/10Gb and 3.5 mm headphone jack. Thunderbolt 2, HDMI, DVI and VGA require adapters.	Four USB 3 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; SDXC, Gigabit Ethernet and 3.5 mm headphone jack; Kensington lock slot. Thunderbolt 2, HDMI, DVI and VGA require separately sold adapters.
External displays
External displays	Two 5120 × 2880 displays at 60 Hz with one billion colours, four 3840 × 2160 displays at 60 Hz with one billion colours, or four 4096 × 2304 displays at 60 Hz with millions of colours, alongside the built-in display	Built-in display at full 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
Speakers
Speakers	Stereo speakers	Stereo speakers; supports Apple iPhone headset with microphone
Microphones
Microphones	Four microphones; supports Hey Siri	Built-in microphone
Keyboard and mouse
Keyboard and mouse	Space grey Magic Keyboard with Numeric Keypad and Magic Mouse 2; optional space grey Magic Trackpad 2	Rechargeable Magic Keyboard and Magic Mouse 2; optional Magic Keyboard with Numeric Keypad and Magic Trackpad 2
Design and power
Type
Type	All-in-one	All-in-one
Weight
Weight	9.7 kg	5.66 kg (better)
Width × depth × height
Width × depth × height	650 × 203 × 516 mm	528 × 175 × 450 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. Optional VESA mount adapter kit.	Dimensions include the stand; weight varies by configuration. 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 aluminium enclosure; arsenic-free glass and mercury-free LED backlight	Recyclable aluminium enclosure; arsenic-free glass and mercury-free LED backlight
In the box
In the box	iMac Pro, space grey Magic Keyboard with Numeric Keypad, space grey Magic Mouse 2, Lightning to USB cable and power lead	iMac, Magic Keyboard, Magic Mouse 2, power lead and Lightning to USB cable