Mac mini G4 (original, 2005)

The Mac mini G4 featured a 1.42 GHz G4 processor, 256 MB of SDRAM memory, an 80 GB Ultra ATA/100 hard drive, and a slot-loading 8X DVD/CD-RW Combo Drive. This is the original Mac mini and was sold as a budget Mac that came with no display, keyboard, or mouse. This computer was a great low-cost option for someone switching from Windows to Mac who already owned a display and USB keyboard and mouse.

The Mac mini G4 had ports including DVI (with a DVI-to-VGA adapter included), USB 2.0, FireWire, and a headphone/line out jack. The original Mac mini supported a wireless AirPort Extreme (802.11g) and Bluetooth card as an option. After July 26, 2005, AirPort Extreme and Bluetooth were provided standard.

The entire computer was 6.5 inches square, 2 inches tall, and weighed 2.9 pounds.

From the day the Mac mini was released, I have always had one permanently connected to my living room stereo system and/or flat panel television and used the Mac mini as my iTunes server. I had previously used a Power Mac G4 Cube for this purpose. With this original Mac mini, I was still using a CRT-based TV so I connected to it remotely. 

Source: EveryMac.com

Mac mini Core 2 Duo (2007)

The Mac mini Core 2 Duo featured a 1.83 GHz Intel Core 2 Duo processor, 1 GB of SDRAM memory, an 80 GB Serial ATA hard drive, a slot-loading 8X DVD/CD-RW Combo drive, and it came with an Apple Remote.

Ports included DVI (with a DVI-to-VGA adapter included), Firewire 400, four USB 2.0 ports, a combined optical digital audio input/audio line in, combined optical digital audio output/headphone, a 10/100/1000Base-T Gigabit Ethernet port, and built-in AirPort Extreme/Bluetooth 2.0. It lacks an internal 56k modem.

This model had the same case as the original Mac mini: 6.5 inches square, 2 inches tall, and weighed 2.9 pounds. This and all Mac mini systems ship without a display, keyboard, or mouse.

I upgraded to this Mac mini from the original due to its larger hard drive and optical digital audio output/headphone jack. I used it for the same purpose as the original to access iTunes and digital movies. It also permanently replaced my DVD player in the age of physical-DVD Netflix (before digital streaming, Netflix movies arrived in the mail on DVDs that played in a DVD player).

Now that this Mac mini has been retired as my media server, I use it to power my digital fireplace.

Source: EveryMac.com