iMac G4 20-inch iMac G4 20-inch

iMac 20-inch Late 2003 Datasheet

In the realm of personal computing, certain milestones stand out, reshaping our expectations and pushing the boundaries of innovation. One such pivotal moment arrived in November 2003 when Apple unveiled the iMac 20-inch Late 2003 (Flat Panel Display). This remarkable addition to the iMac G4 series revolutionized desktop computing with its advanced features and elegant design.

At its core, the iMac 20-inch Late 2003 boasted the largest flat-panel display ever integrated into an all-in-one desktop. Apple’s bold move to introduce this expansive 20-inch display set a new standard for immersive computing experiences. Compared to its predecessors, such as the 15- and 17-inch models, the 20-inch iMac offered twice the screen area, empowering users to effortlessly multitask by viewing more than two full pages side-by-side.

Accompanying its impressive display, the iMac 20-inch Late 2003 came equipped with Apple’s latest operating system, Mac OS X 10.3 Panther. This upgrade introduced over 150 groundbreaking features, including Exposé, iChat AV, and Fast User Switching. With these tools at their fingertips, users could seamlessly manage multiple tasks, engage in video teleconferencing, and swiftly switch between user profiles.

Philip Schiller, Apple’s senior vice president of Worldwide Product Marketing, aptly captured the essence of the iMac’s design ethos, describing it as “unmatched in the industry.” The iMac’s sleek, all-in-one design, coupled with its adjustable display, created an illusion of floating in mid-air. This ergonomic innovation allowed users to effortlessly customize the height and angle of their display, ensuring optimal viewing comfort.

iMac_G4 15-, 17-, and 20-inch
Source: – iMac_G4 15-, 17-, and 20-inch

Underneath its aesthetically pleasing exterior, the iMac 20-inch Late 2003 housed formidable hardware tailored to meet the demands of modern computing tasks. Powered by a robust PowerPC G4 processor clocked at 1.25 GHz, coupled with 256 MB of fast DDR SDRAM, this machine delivered swift and responsive performance. Whether indulging in video editing, DVD creation, or web browsing, users could count on the iMac to handle their tasks with ease.

The iMac 20-inch Late 2003 wasn’t just a productivity workhorse; it also excelled in delivering an immersive multimedia experience. Boasting a pixel resolution of up to 1680-by-1050, the brilliant LCD display provided flicker-free images with unparalleled brightness, sharpness, and contrast ratio. This made it an ideal companion for tasks such as video editing, DVD playback, and gaming, elevating the user’s entertainment quotient.

Apple left no stone unturned in ensuring that the iMac catered to the diverse connectivity needs of its users. With two FireWire 400 and three high-speed USB 2.0 ports, users could effortlessly connect a myriad of devices, including digital cameras, DV camcorders, and iPods. Additionally, support for AirPort Extreme 802.11g wireless networking and optional built-in Bluetooth paved the way for wireless connectivity to peripherals, further enhancing the iMac’s versatility.

Every iMac came bundled with Apple’s iLife applications, a suite of integrated tools designed to streamline digital lifestyle experiences. From managing digital music with iTunes to creating movies with iMovie, users had access to a comprehensive toolkit for unleashing their creativity. Additionally, productivity and entertainment titles such as Quicken 2003 Deluxe and Tony Hawk’s Pro Skater 4 added further value to the iMac experience.

Though nearly 20 years have passed since its release, the iMac 20-inch Late 2003 continues to command attention from collectors and enthusiasts alike. Its vintage design and technological prowess serve as a testament to Apple’s relentless pursuit of innovation. Despite its age, this iconic machine remains functional, capable of running basic software applications and even some modern games, underscoring its enduring legacy in the annals of computing history.

Upon its release, the iMac 20-inch Late 2003 was priced at $2,199, offering a compelling array of features at a competitive price point. Available through the Apple Store, Apple’s retail outlets, and authorized resellers, users had access to build-to-order options and a range of accessories, allowing them to tailor their iMac experience to suit their specific needs.

In retrospect, the iMac 20-inch Late 2003 stands as a testament to Apple’s commitment to innovation and design excellence. Its impact reverberates through the corridors of technological advancement, inspiring future generations of creators and innovators.

iMac with Flat Panel Display
Source: – iMac with Flat Panel Display

iMac 20-inch Late 2003 Details

IntroducedNovember 18, 2003
DiscontinuedJuly 1, 2004
Model IdentifierPowerMac6,3
Model NumberM6498
Order NumberM9290LL/A
Original Price$2,199
Weight40.1 Ibs.
18.189 KG
Dimensions13.93 – 20.9” H x 17.3 – 20.2” W x 10.6 – 17.3” D
35.38 – 51.02 cm H x 43.94 – 51.3 cm W x 26.92 – 43.94 cm D
Base diameter 10.6″ / 26.92 cm

iMac G4 20-inch Tech Specs


ProcessorPowerPC 7445 G4
Processor Speed1.25 GHz
Number of Cores1
System Bus167 MHz
Cache64 KB L1
256 KB backside L2
CoprocessorBuilt-in FPU

Storage & Media

Storage80 GB
160 GB
Media1 – 4x DVD-R/CD-RW “SuperDrive”


Built-in Memory256 MB
Maximum Memory1 GB (Apple)
2 GB (Actual)
Memory Slots1 – PC-2700 200-pin SO-DIMM (User accessible)
1 – PC-2700 184-pin SDRAM (Factory-Installed)
Interleaving SupportNo


Built-in Display20″ TFT LCD Display
Brightness230 cd/m²
Resolutions800 x 500
840 x 524
1024 x 640
1280 x 800
1344 x 840
1680 x 1050 (Native)


Graphics CardNVIDIA GeForce FX 5200 Ultra
Graphics Memory64 MB
Display Connection1 – Mini-VGA (Composite and S-video with adapter)
Display ModesVideo mirroring only
External Resolution640 x 480 at 60Hz
800 x 600 at 75Hz
1024 x 768 at 75Hz


Expansion SlotsNone
Optical Drive InterfaceUltra ATA/66
Hard Drive InterfaceUltra ATA/100 (ATA-6)


Ethernet10/100BASE-T (RJ-45)
Wi-FiAirPort Extreme Card 802.11b/g (Optional)
BluetoothBluetooth 1.1 (Optional)
USB3 – 480 Mbps (USB 2.0)
FireWire2 – 400 Mbps
Audio In1 – 3.5-mm analog input jack
1 – Built-in microphone
Audio Out1 – 3.5-mm analog output jack
1 – 2.5-mm Apple Pro Speaker minijack
1 – Built-in speaker
Display1 – Mini-VGA (Composite and S-video with adapter)

Keyboard and Mouse

PeripheralsApple Keyboard
Apple Mouse


Original OSMac OS X 10.3
Later OSMac OS X 10.3.1
Maximum OSMac OS X 10.5.8
FirmwareMac OS ROM
Bundled SoftwareMac OS X 10.3
iMovie 2
iTunes 2
iDVD 2
DVD Player
Mac OS X Mail
Microsoft Internet Explorer
EarthLink (includes 30 days of free service)
Quicken 2002 Deluxe
World Book Mac OS X Edition
Mac OS X Chess
Otto Matic
Deimos Rising
Acrobat Reader


Backup Battery3.6 V Lithium (922-4760)
Maximum Continuous Power190 W
Line Voltage90-264 V AC

Further Reading and References

Disclaimer: The data presented in this article is under continuous development and has been manually collected from various sources based on their availability. The author of this article may revise this dataset as additional research is conducted and reviewed. Please note that the information is provided “as is” and “as available” without express or implied warranties. The author cannot be held responsible for any omissions, inaccuracies, or errors in the published information. Any warranties relating to this information are hereby disclaimed.

Last updated: February 24, 2024