• 2.7GHz quad-core Intel Core i5 with 6MB on-chip shared L3 cache
  
• 3.1GHz quad-core Intel Core i5 with 6MB on-chip shared L3 cache
• 3.4GHz quad-core Intel Core i7 with 8MB on-chip shared L3 cache

Memory

4GB (two 2GB) of 1333MHz DDR3 memory
Configurable to 16GB, only at the Apple Online Store.

Storage

• 1TB (7200 rpm) hard drive
• 2TB (7200 rpm) hard drive
• 256GB solid-state second drive

Graphics & Display

• AMD Radeon HD 6770M graphics processor with 512MB of GDDR5 memory
• AMD Radeon HD 6970M graphics processor with 1GB of GDDR5 memory
• AMD Radeon HD 6970M graphics processor with 2GB of GDDR5 memory
• 27-inch (viewable) LED-backlit glossy widescreen TFT display with a Resolution of 2560 by 1440
• 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

Audio

• Built-in stereo speakers
• Two internal 17-watt high-efficiency amplifiers
• Headphone/optical digital audio output (minijack)
• Audio line in/optical digital audio input (minijack)
• Built-in microphone

Connections and Expansion

• Two Thunderbolt ports
• Mini DisplayPort output with support for DVI, VGA, and dual-link DVI
• One FireWire 800 port; 7 watts
• 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

Wireless

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