These Intel Core i5 2.7 27-Inch Aluminum Mid-2011 iMacs are powered by a Quad Core 2.7 GHz Intel Core i5 Sandy Bridge processor with a dedicated 256k level 2 cache for each core and a 6 MB shared level 3 cache.
They are configured with 8 GB of RAM 1333 MHz PC3-10600 DDR3 SDRAM, a 500 GB 7200 RPM hard drive, a vertically-mounted slot-loading DVD±R DL SuperDrive, and AMD Radeon HD 6770M graphics with 512 MB of dedicated GDDR5 memory.
It also has a built-in FaceTime HD video camera and built-in stereo speakers underneath the 27″ glossy 16:9 LED-backlit TFT Active Matrix LCD (2560×1440 native) display.
Connectivity includes four USB 2.0 ports, a Firewire 800 port, built-in AirPort Extreme, Gigabit Ethernet, and an SDXC card slot as well as dual Thunderbolt ports that are backwards compatible with Mini DisplayPort and, likewise, each support an external display up to 30″ (2560×1600). Thunderbolt also supports other peripherals that use the Thunderbolt standard which provides up to 10 Gbps of bandwidth in both directions.