iMac 21.5 A1418 – 2544 Core i7 Late-2012, 16GB, 256GB SSD, 1080p, Silver

The iMac “Core i7” 2.7 21.5-Inch Aluminum (Late 2012) features a 22 nm Quad Core Core i7 (Ivy Bridge) processor with four independent processor cores on a single chip, 16 GB of 1600 MHz DDR3 SDRAM (which is not intended to be upgraded after purchase), a 256GB SSD, and a 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.
This model has a 21.5″ 1920×1080 LED-backlit 16:9 widescreen IPS display with the “cover glass fully laminated to the LCD and anti-reflective coating.” The rear of the case is aluminum and is thicker in the middle and tapers to a razor thin 5 mm at the edges.
Connectivity includes four USB 3.0 ports, dual Thunderbolt ports, Gigabit Ethernet, 802.11n, and Bluetooth 4.0.
In addition to a thinner case design, the “Late 2012” iMac models have faster processors, faster architectures, faster RAM (although it cannot be upgraded easily in the 21.5-Inch models), faster graphics, as well as different connectivity than the “Mid-2011” iMac line replaced.