Apple iMac 27" 3TB 5K
Installed Memory: 8 GB (1867MHz LPDDR3 SDRAM)
Installed Memory: 3TB Fusion Drive
Operating System: Mac OS X 10.10 Yosemite
Processor: 4.0GHz quad-core Intel Core i7, Turbo Boost up to 4.2GHz
Video: 4GB of GDDR5 AMD Radeon R9 M395X
Video: 27-inch Retina 5K display with IPS technology (5120-by-2880 resolution)
Display
Retina 5K display
27-inch (diagonal) Retina 5K display with IPS technology;
5120-by-2880 resolution with support for millions of colors
Processor
4.0GHz quad-core Intel Core i7, Turbo Boost up to 4.2GHz
Memory
8GB of 1867MHz LPDDR3 memory four SO-DIMM slots,
user accessible Configurable to 64GB
Storage
3TB Fusion Drive
Graphics
4GB of GDDR5 AMD Radeon R9 M395X
Audio
Stereo speakers
Dual microphones
3.5 mm headphone jack Headphone/optical digital audio output (minijack)
Support for Apple iPhone headset with microphone
Connections and Expansion
3.5 mm headphone jack SDXC card slot
Four USB 3 ports (compatible with USB2) Two Thunderbolt 2 ports Mini DisplayPort output Support for HDMI, DVI, VGA,
and dual-link DVI (adapters sold separately)
10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector) Kensington lock slot.
Wireless
Wi-Fi 802.11ac Wi-Fi wireless networking
IEEE 802.11a/b/g/n compatible
Bluetooth
Bluetooth 4.0 wireless technology
Size and Weight
Height:20.3 inches (51.6 cm)
Width:25.6 inches (65.0 cm)
Stand depth:8 inches (20.3 cm)
Weight:21 pounds (9.54 kg)
IMac 27" 3TB 5K * 4.0GHz quad-core Intel Core i7, Turbo Boost up to 4.2GHz * 8 G 
