• 27-inch (viewable) LED-backlit glossy widescreen TFT display with support for millions of colours
• Resolution: 2560×1440 pixels
• Processor: 3.4GHz quad-core Intel Core i7 with 6MB on-chip shared L3 cache
• Memory: 16GB of 1333MHz DDR3 memory
• Hard Drive: 2TB (7200 rpm)

Graphics:

• AMD Radeon HD 6970M graphics processor with 2GB 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 (2560×1600 pixels) on an external display
• Support for extended desktop and video mirroring modes

Audio:

• Built-in stereo speakers
• Two internal 17-watt high-efficiency amplifiers
• Headphone / optical digital audio output (mini-jack)
• Audio line in / optical digital audio input (mini-jack)
• Built-in microphone
• Support for Apple iPhone headset with microphone

Connections & Expansions:

• One Thunderbolt port on 21.5-inch iMac
• Two Thunderbolt ports on 27-inch iMac
• Mini DisplayPort output with support for DVI, VGA and dual-link DVI (adapters sold separately)
• One FireWire 800 port
• Four USB 2.0 ports
• SDXC card slot
• Slot-loading 8x SuperDrive with 4x double-layer burning (DVD±R DL/DVD±RW/CD-RW)
• Audio in/out
• 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)
• IR receiver

Input:

• Apple Wired Keyboard – Full-size keyboard
• Wireless Mighty Mouse.

Wireless:

• Wi-Fi
• 802.11n Wi-Fi wireless networking
• 2 IEEE 802.11a/b/g compatible
• Bluetooth
• Bluetooth 2.1 + EDR (Enhanced Data Rate) wireless technology

Size & Weight:

• Height: 45.1 cm (17.75 inches) Width: 52.8 cm (20.8 inches) Depth: 18.85 cm (7.42 inches) Weight: 9.3 kg (20.5 pounds)