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Apple iMac Pro (2017) vs Apple iMac (Retina 5K, 27-inch, Late 2015)

Every spec side by side, from each maker's published figures.

Better figure, where one is clearly better

AppleiMac Pro (2017)AppleiMac (Retina 5K, 27-inch, Late 2015)
Overview
ReleasedDecember 2017October 2015
Performance
ProcessorIntel Xeon W-2140B, Intel Xeon W-2150B, Intel Xeon W-2170B or Intel Xeon W-2191BIntel Core i5-6500, Intel Core i7-6700K or Intel Core i5-6600
CPU cores8, 10, 14 or 184
CPU threads–4 or 8
GraphicsRadeon Pro Vega 56 (8 GB HBM2), Radeon Pro Vega 64 (16 GB HBM2) or Radeon Pro Vega 64X (16 GB HBM2)AMD Radeon R9 M380 (2 GB GDDR5), AMD Radeon R9 M390 (2 GB GDDR5), AMD Radeon R9 M395 (2 GB GDDR5) or AMD Radeon R9 M395X (4 GB GDDR5)
Memory32 GB, 64 GB, 128 GB or 256 GB8 GB, 16 GB or 32 GB
Storage1 TB to 4 TB256 GB to 3 TB
CPUXeon 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 2020.3.2 GHz quad-core Core i5 with Turbo Boost up to 3.6 GHz in the M380 and M390 models; 3.3 GHz quad-core Core i5 with Turbo Boost up to 3.9 GHz in the M395 model. Only the M390 and M395 bases support the 4.0 GHz Core i7 upgrade, with Turbo Boost up to 4.2 GHz.
GPURadeon 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.AMD Radeon R9 M380 or M390 with 2 GB GDDR5; M395 with 2 GB GDDR5 in the upper base, configurable to M395X with 4 GB GDDR5 only in that base
Memory typeQuad-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.1867 MHz DDR3; 8 GB standard as two 4 GB modules, configurable to 16 GB or 32 GB; four user-accessible SO-DIMM slots
Storage type1 TB SSD, configurable to 2 or 4 TBM380 base: 1 TB 7200-rpm hard drive, 1/2/3 TB Fusion Drive or 256/512 GB SSD. M390 base: 1/2/3 TB Fusion Drive or 256/512 GB/1 TB SSD. M395 base: 2/3 TB Fusion Drive or 256/512 GB/1 TB SSD. The 1 TB Fusion Drive has 24 GB of flash; 2/3 TB Fusion Drives have 128 GB.
Display
Screen size27″27″
Resolution5120 × 28805120 × 2880
PanelIPS LCDIPS LCD
Brightness500 nits–
Display typeLED-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 5K display with IPS technology and support for millions of colours
Display featuresWide colour (P3); supports one billion coloursP3 colour gamut; Apple does not publish brightness or refresh rate in this model's specification sheet
Connections
Ports4 × Thunderbolt 3, 4 × USB-A, SD card slot, Ethernet, headphone jack2 × Thunderbolt 2, 4 × USB-A, SD card slot, Ethernet, headphone jack
Ethernet10 Gb/s1 Gb/s
External displaysUp to 4Up to 2
Wi-Fi802.11ac802.11ac
Bluetooth5.04.0
Camera1080p FaceTime HDFaceTime HD
Back portsFour 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 2 ports with Mini DisplayPort output, SDXC card slot, Gigabit Ethernet, 3.5 mm headphone and optical digital audio output; Kensington lock slot. HDMI, DVI, VGA and dual-link DVI require separately sold adapters.
External displaysTwo 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 displayBuilt-in display at full native resolution alongside up to two 4096 × 2160 displays, or one 5120 × 2880 dual-cable display; extended desktop and video mirroring
SpeakersStereo speakersStereo speakers; supports Apple iPhone headset with microphone
MicrophonesFour microphones; supports Hey SiriDual microphones
Keyboard and mouseSpace grey Magic Keyboard with Numeric Keypad and Magic Mouse 2; optional space grey Magic Trackpad 2Rechargeable Magic Keyboard and Magic Mouse 2; optional Magic Trackpad 2 with Force Touch
Design and power
TypeAll-in-oneAll-in-one
Weight9.7 kg9.54 kg
Width × depth × height650 × 203 × 516 mm650 × 203 × 516 mm
Operating systemmacOSmacOS
Size and weight detailDimensions 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 supply100–240 V AC, 50–60 Hz, single phase100–240 V AC, 50–60 Hz, single phase
Noise–Apple's 3.3 GHz Core i5, 8 GB, 2 TB Fusion Drive and Radeon M395 test configuration: operator-position sound pressure 15.5 dB at idle, wireless web and hard-drive seek
MaterialsRecyclable aluminium enclosure; arsenic-free glass and mercury-free LED backlightRecyclable aluminium enclosure; arsenic-free display glass; mercury-free LED backlight
In the boxiMac Pro, space grey Magic Keyboard with Numeric Keypad, space grey Magic Mouse 2, Lightning to USB cable and power leadiMac, Magic Keyboard, Magic Mouse 2, power lead and Lightning to USB cable

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