Product Features 2.7GHz quad-core Intel Core i5 with 6MB on-chip shared L3 cache 1 TB Hard Drive, 4GB 1333MHz DDR3 SDRAM, DVD SuperDrive 27" LED-backlit display with a widescreen 16:9 aspect ratio, 2560x1440 HD resolution AMD Radeon HD 6770M graphics processor with 512MB of GDDR5 memory Mac OS X v10.6 Snow Leopard, Magic Mouse