iMac G5 2.0 20-inch (2005)

The iMac G5 featured a 2.0 GHz PowerPC 970 (G5) processor, 512 MB of 400 MHz PC3200 DDR SDRAM, a 250 GB (7200 RPM) Serial ATA hard drive, a vertically-mounted slot-loading 8X DVD-R/CD-RW SuperDrive, and built-in stereo speakers at the bottom of the display. The screen was a 20-inch TFT Active Matrix LCD at 1680×1050. Wired ports included FireWire 400 and USB 2.0. Wireless connections included AirPort Extreme (802.11g) and Bluetooth 2.0+EDR.

Like its predecessors, the iMac G5 rested on an aluminum stand with an adjustable hinge. It also supported the VESA (Video Electronics Standards Association) mounting interface standard which allowed the iMac to be mounted directly on a kiosk, wall, or arm. The iMac G5 also had an Ambient Light Sensor under the edge of the display that dims the sleep indicator light when the room is dark.

Source: EveryMac.com

iMac G4/1.25 20-inch (2003)

The iMac G4/1.25 20-inch Flat Panel featured a 1.25 GHz PowerPC 7445 (G4) processor, 256 MB of RAM (333 MHz PC2700 DDR SDRAM), an 80.0 GB Ultra ATA/100 hard drive (7200 RPM), a tray-loading 4X SuperDrive, support for AirPort Extreme (802.11g)/Bluetooth with optional cards, and a 20-inch TFT Active Matrix LCD display at 1680×1050.

The internal components of this iMac are contained in a 10.6-inch half-sphere. Protruding from the top of the half sphere was a chrome stainless steel neck supporting the display. This design is sometimes referred to as the “sunflower iMac.” In addition to the polished stainless steel, the case and display are “ice white.” It shipped with two clear spherical external Apple Pro Speakers.

This iMac shipped with MacOS X 10.3 Panther and cannot boot into “Classic Mode” (MacOS 9).

Source: EveryMac.com