iMac “Core i5” 2.7 21.5-Inch Aluminum (Late 2012)

Features

A 22 nm Quad Core 2.7 GHz Intel “Core i5” I5-3330S (Ivy Bridge) processor with four independent processor cores on a single chip.
A 6 MB shared level 3 cache, 8 GB of 1600 MHz DDR3 SDRAM (which is not intended to be upgraded after purchase),
A 1TB (5400 RPM) hard drive
An NVIDIA GeForce GT 640M graphics processor with 512 MB of dedicated GDDR5 memory.
It also has a built-in “FaceTime HD” webcam and stereo speakers, but lacks an optical drive.