The iMac "Core i7" 3.4 27-Inch Aluminum (Mid-2011) originally was offered as a "configure-to-order" configuration of the iMac "Core i5" 3.1 27-Inch Aluminum (Mid-2011), but it later was offered a standard configuration, as well. Other than processor (and the corresponding level 3 cache), these two models are identical.
The iMac "Core i7" 3.4 27-Inch Aluminum (Mid-2011) is powered by a Quad Core 3.4 GHz Intel "Core i7" I7-2600 (Sandy Bridge) processor with a dedicated 256k level 2 cache for each core and an 8 MB shared level 3 cache. In lieu of a system bus, it has a "Direct Media Interface" (DMI) that "connects between the processor and chipset" at 5 GT/s.
Key Features
A quad-core 3.4 GHz Intel Core i7 processor with 8 MB of shared level 3 cache
8GB, 16GB, 32GB of 1333 MHz DDR3 RAM
256GB, 512GB, 1TB, 2TB SSD
A slot-loading 8x SuperDrive
An AMD Radeon HD 6970M graphics card with 1 GB of GDDR5 memory
A 27-inch LED-backlit display with 2560x1440 resolution and IPS technology
A built-in FaceTime HD camera and stereo speakers
Four USB 2.0 ports, a FireWire 800 port, an SDXC card slot, and two Thunderbolt ports
Model : MD063LL/A
macOS
Year : 2011
Built-in AirPort Extreme
Bluetooth 2.1+EDR
Gigabit Ethernet
A wireless keyboard and a Magic Mouse or Magic Trackpad
