The Mac mini "Core 2 Duo 2.66 (Late 2009) technically is a "build-to-order" configuration of the Mac mini "Core 2 Duo" 2.53 (Late 2009), but also is documented as a separate model for reader convenience. Other than processor speed, these two models are identical.

The Apple Mac mini "Core 2 Duo" 2.66 (Late 2009) features a 2.66 GHz Intel "Core 2 Duo" (P8800) processor, a 3 MB on-chip level 2 cache, a 1066 MHz frontside bus, 4 GB of 1066 MHz DDR3 SDRAM (PC3-8500) memory, a 320 GB Serial ATA hard drive, a slot-loading 8X double-layer "SuperDrive", and a NVIDIA GeForce 9400M graphics processor with 256 MB of memory shared with the system.

Connectivity includes Mini-DVI and Mini DisplayPort, a Firewire "800" port, five USB 2.0 ports, combined "optical digital audio input/audio line in" and combined "optical digital audio output/headphone" minijacks, a 10/100/1000Base-T Gigabit Ethernet port, and built-in AirPort Extreme (802.11a/b/g/n) and Bluetooth 2.1+EDR.

Late 2009 Mac mini models have the internal components enclosed in a tiny and elegant 2.9 lb, 6.5 inch square, two inch tall case with a built-in speaker and an external power supply. All Mac mini systems ship without a display, keyboard, or mouse, but numerous Apple and third-party options are available.

Also see: What are the differences between the "Late 2009" Mac mini "Core 2 Duo" configurations? What are the differences between these Mac mini models and the models replaced?