Apple iMac G5 (20-inch, Ambient Light Sensor) vs Apple iMac (Retina 5K, 27-inch, 2020)

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

Only show differences

Better figure, where one is clearly better

Share comparison

iMac G5 (20-inch, Ambient Light Sensor) compared with iMac (Retina 5K, 27-inch, 2020)

	AppleiMac G5 (20-inch, Ambient Light Sensor)	AppleiMac (Retina 5K, 27-inch, 2020)
Overview
Released
Released	May 2005	August 2020
Performance
Processor
Processor	IBM PowerPC G5 2 GHz (iMac Ambient Light Sensor)	Intel Core i5-10500, Intel Core i5-10600, Intel Core i9-10910 or Intel Core i7-10700K
CPU cores
CPU cores	1	6, 8 or 10
CPU threads
CPU threads	–	12, 16 or 20
Graphics
Graphics	ATI Radeon 9600 (128 MB)	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)
Memory
Memory	512 MB or 2 GB	8 GB, 16 GB, 32 GB, 64 GB or 128 GB (better)
Storage
Storage	250 GB to 400 GB	256 GB to 8 TB (better)
CPU
CPU	2.0 GHz PowerPC G5 with 667 MHz frontside bus, 512 KB L2 cache and SuperDrive. Generic maker-clock chip records retain the single-core identity cross-checked with exact EveryMac sources; uncertain 970/970FX silicon revision is not inferred.	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.
GPU
GPU	ATI Radeon 9600 with 128 MB dedicated video memory; AGP 8x support.	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.
Memory type
Memory type	400 MHz DDR SDRAM (PC3200), two 184-pin DIMM slots; 512 MB standard and 2 GB supported maximum. Configurations conservatively list the published base and maximum; no intermediate factory pairing is inferred.	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.
Storage type
Storage type	250 GB 7200 rpm Serial ATA hard drive, configurable to 400 GB; 8x SuperDrive with 2.4x double-layer DVD writing.	Lower base: fixed 256 GB SSD. Middle base: 512 GB/1/2 TB SSD. Upper base: 512 GB/1/2/4/8 TB SSD.
Display
Screen size
Screen size	20″	27″
Resolution
Resolution	1680 × 1050	5120 × 2880 (better)
Panel
Panel	–	IPS LCD
Brightness
Brightness	–	500 nits
Display type
Display type	Widescreen LCD with millions of colours; panel technology, refresh rate and brightness not published in the retained exact maker specification.	LED-backlit Retina 5K display; IPS panel confirmed by EveryMac. Apple does not publish native refresh rate in the specification sheet.
Display features
Display features	–	Wide colour (P3), one billion colours and True Tone; standard glass or optional nano-texture glass
Connections
Ports
Ports	3 × USB-A, Ethernet, headphone jack	2 × Thunderbolt 3, 4 × USB-A, SD card slot, Ethernet, headphone jack
Ethernet
Ethernet	1 Gb/s	1 Gb/s
External displays
External displays	–	Up to 2
Wi-Fi
Wi-Fi	802.11g	802.11ac
Bluetooth
Bluetooth	2.0 + EDR	5.0
Camera
Camera	–	1080p FaceTime HD
Back ports
Back ports	Three USB 2.0 ports on the computer, plus two USB 1.1 ports on the keyboard; two FireWire 400 ports, Mini-VGA output, Gigabit Ethernet, headphone/optical output and audio line-in. Built-in 56K V.92 modem is confirmed by launch press and exact manual; retained USB-HSP wording describes its internal transport, rather than an extra external USB device.	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.
External displays
External displays	Optional Mini-VGA adapters provide VGA, S-video or composite output; no DVI connector is listed.	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.
Speakers
Speakers	Built-in stereo speakers and microphone.	Stereo speakers
Microphones
Microphones	–	Three-mic array with directional beamforming; supports Hey Siri
Keyboard and mouse
Keyboard and mouse	Apple Keyboard and Apple Mouse; the later Mighty Mouse and iSight-generation remote are not substituted for the launch accessories.	Rechargeable Magic Keyboard and Magic Mouse 2; optional numeric keyboard and Magic Trackpad
Design and power
Type
Type	All-in-one	All-in-one
Weight
Weight	11.4 kg	8.92 kg (better)
Width × depth × height
Width × depth × height	493 × 189 × 472 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.
Power supply
Power supply	–	100–240 V AC, 50–60 Hz, single phase
Materials
Materials	–	Recyclable, low-carbon aluminium enclosure; arsenic-free glass and mercury-free LED backlight
In the box
In the box	iMac G5, keyboard, mouse, power cord, install/restore DVDs and documentation; Mac OS X Tiger, iLife ’05 and AppleWorks. Classic support is available but not preinstalled and cannot boot Mac OS 9.	iMac, Magic Keyboard, Magic Mouse 2, power lead, Lightning to USB cable and polishing cloth