The iMac “Core i7” 3.1 21.5-Inch Aluminum (Late 2012) technically is a “configure-to-order” configuration of the iMac “Core i5” 2.9 21.5-Inch Aluminum (Late 2012), but also is documented as a separate model for reader convenience. Other than processor (and the corresponding level 3 cache), these two models are identical.
The iMac “Core i7” 3.1 21.5-Inch Aluminum (Late 2012) features a 22 nm Quad Core 3.1 GHz Intel “Core i7” I7-3770S (Ivy Bridge) processor with fourindependent processor cores on a single chip, an 8 MB shared level 3 cache, 8 GB of 1600 MHz DDR3 SDRAM (which is not intended to be upgraded after purchase), a 1 TB (5400 RPM) hard drive, and a NVIDIA GeForce GT 650M 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.