21.5-inch (diagonal) LED-backlit display with IPS technology; 1920-by-1080 resolution with support for millions of colors
2.7GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.2GHz) with 4MB L3 cache
2.9GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.6GHz) with 6MB L3 cache
Configurable to 3.1GHz quad-core Intel Core i7 (Turbo Boost up to 3.9GHz).
8GB (two 4GB) of 1600MHz DDR3 memory
Configurable to 16GB.
1TB (5400-rpm) hard drive
Configurable to 1TB Fusion Drive or 256GB or 512GB of flash storage.
Intel Iris Pro graphics
NVIDIA GeForce GT 750M graphics processor with 1GB of GDDR5 memory
Video Support and Camera
FaceTime HD camera
Simultaneously supports full native resolution on the built-in display and up to a 30-inch display (2560 by 1600 pixels) on an external display
Support for extended desktop and video mirroring modes
Support for Target Display Mode via the Thunderbolt port using a Thunderbolt to Thunderbolt cable (sold separately)
Headphone/optical digital audio output (minijack)
Support for Apple iPhone headset with microphone
Connections and Expansion
SDXC card slot
Four USB 3 ports (compatible with USB 2)
Two Thunderbolt ports
Mini DisplayPort output with support for DVI, VGA, and dual-link DVI (adapters sold separately)
10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)
Kensington lock slot