Apple iMac (21.5-inch, 2017) vs Apple iMac G3 (Revision B)

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iMac (21.5-inch, 2017) compared with iMac G3 (Revision B)

	AppleiMac (21.5-inch, 2017)	AppleiMac G3 (Revision B)
Overview
Released
Released	June 2017	October 1998
Performance
Processor
Processor	Intel Core i5-7360U	PowerPC G3 233 MHz (iMac)
CPU cores
CPU cores	2	1
CPU threads
CPU threads	4	–
Graphics
Graphics	Intel Iris Plus Graphics 640	ATI RAGE Pro (6 MB)
Memory
Memory	8 GB or 16 GB (better)	32 MB or 256 MB
Storage
Storage	256 GB to 1 TB (better)	4 GB
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	233 MHz PowerPC G3 with 66 MHz system bus and 512 KB backside L2 cache. The generic chip record names no supplier; MacGeneration identifies a Motorola PowerPC 750 in its reviewed Revision B unit.
GPU
GPU	Intel Iris Plus Graphics 640; no discrete graphics option	ATI RAGE Pro graphics with 6 MB video memory; Apple’s developer history confirms the graphics change from the original RAGE IIc model.
Memory type
Memory type	8 GB of 2133 MHz DDR4, configurable to 16 GB	32 MB SDRAM standard, two SO-DIMM slots. Current retained Apple Revision B sheet supports up to 256 MB; the older developer history gives 128 MB. Configurations use the current maximum, with the conflict recorded.
Storage type
Storage type	1 TB 5400-rpm hard drive, configurable to 1 TB Fusion Drive or 256 GB SSD	4 GB IDE hard drive and tray-loading 24x CD-ROM.
Display
Screen size
Screen size	21.5″	15″
Resolution
Resolution	1920 × 1080 (better)	1024 × 768
Refresh rate
Refresh rate	–	75 Hz
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.	Nominal 15-inch CRT, 13.8-inch viewable diagonal; no fixed LCD native resolution.
Display features
Display features	–	1024 × 768 at 75 Hz, 800 × 600 at 95 Hz and 640 × 480 at 117 Hz (EveryMac exact A/B specification).
Connections
Ports
Ports	2 × Thunderbolt 3, 4 × USB-A, SD card slot, Ethernet, headphone jack	2 × USB-A, Ethernet, 2 × headphone jack
Ethernet
Ethernet	1 Gb/s (better)	0.1 Gb/s
External displays
External displays	Up to 2	–
Wi-Fi
Wi-Fi	802.11ac	–
Bluetooth
Bluetooth	4.2	–
Camera
Camera	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 USB ports, 10/100BASE-T Ethernet, 56K modem and audio line-in/out, plus two front headphone jacks. The retained combined maker sheet lists IrDA; Apple’s developer comparison lists it only for the original revision, while MacGeneration’s physical Revision B review shows the infrared window. No standard FireWire or VGA output.
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	–
Speakers
Speakers	Stereo speakers; supports Apple iPhone headset with microphone	Built-in stereo speakers and microphone.
Microphones
Microphones	Built-in microphone	–
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	Apple USB Keyboard and round Apple USB Mouse.
Design and power
Type
Type	All-in-one	All-in-one
Weight
Weight	5.44 kg	–
Width × depth × height
Width × depth × height	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. A built-in VESA mount version was available.	Maker retained sheet gives height 15.8, width 15.2 and depth 17.6 inches, weight 40 pounds. Metric figures from the original revision are not borrowed.
Power supply
Power supply	100–240 V AC, 50–60 Hz, single phase	–
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	–
Materials
Materials	Aluminium enclosure; arsenic-free display glass; mercury-, BFR- and beryllium-free with regional exceptions for PVC-free power leads	–
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.	Mac OS 8.5. Conservative October 1998 sale month follows MacGeneration’s exact Revision B retrospective; published introduction days differ and are not treated as a verified worldwide first-sale day.