iMac Core 2 Duo 20-inch (2007)

iMac Core 2 Duo 20-Inch featured a 2.4 GHz Intel Core 2 Duo processor (two processors on a single chip), 1 GB of RAM, a 320 GB Serial ATA hard drive, a slot-loading DVD+R DL SuperDrive, a built-in iSight video camera, and built-in stereo speakers. The screen was a 20-inch glossy TFT Active Matrix LCD at 1680×1050. Ports included three USB 2.0 ports, a Firewire 400 port, a Firewire 800 port, Gigabit Ethernet, and mini-DVI. It also included built-in AirPort Extreme.

The exterior aluminum case had a black plastic back. The iMac Core 2 Duo also shipped with a matching aluminum Apple Keyboard with a design similar to the keyboard on the MacBook at the time.

Source: EveryMac.com

iMac Core 2 Duo 2.0 17-inch (2006)

The iMac Core 2 Duo 2.0 was the second iMac design to use a flat-panel display. It featured a 2.0 GHz Intel Core 2 Duo processor (T7200) (with two independent processor cores on a single chip), 1 GB of RAM (667 MHz DDR2 SDRAM, PC2-5300), a 160 GB (7200 RPM) Serial ATA hard drive, a vertically-mounted slot-loading DVD+R DL SuperDrive, a built-in iSight video camera, and built-in stereo speakers. The flat panel display was a 17-inch TFT Active Matrix LCD at 1440×900 pixels.

Ports on this iMac included three USB 2.0 ports, two FireWire 400 ports, Gigabit Ethernet, and mini-DVI supporting an external display in extended desktop mode (rather than only supporting mirrored mode). This iMac also included built-in AirPort Extreme support.

Source: EveryMac.com