Retina display: 15.4-inch (diagonal) LED-backlit display with IPS technology; 2880-by-1800 native resolution at 220 pixels per inch with support for millions of colors
Scaled resolutions: 1920 by 1200, 1680 by 1050, 1280 by 800, and 1024 by 640 pixels
2.3GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.3GHz) with 6MB shared L3 cache
Configurable to 2.6GHz quad-core Intel Core i7 (Turbo Boost up to 3.6GHz) with 6MB shared L3 cache or 2.7GHz quad-core Intel Core i7 (Turbo Boost up to 3.7GHz) with 8MB shared L3 cache.
8GB of 1600MHz DDR3L onboard memory
Configurable to 16GB.