The device is running -very smoothly and fast- on a genuine WINDOWS-10 PRO (worth 900+ SAR) along with its original mac OS (2 PCs in 1 device).
Please find the full specs below:
27-inch (diagonal) LED-backlit display with IPS technology; 2560-by-1440 resolution with support for millions of colors
3.4GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.8GHz) with 6MB L3 cache
Configurable to 3.5GHz quad-core Intel Core i7 (Turbo Boost up to 3.9GHz).
8GB (two 4GB) of 1600MHz DDR3 memory; four user-accessible SO-DIMM slots
Configurable to 16GB or 32GB.
1TB (7200-rpm) hard drive
Configurable to 3TB hard drive, 1TB or 3TB Fusion Drive, or 256GB, 512GB, or 1TB of flash storage.
NVIDIA GeForce GTX 775M graphics processor with 2GB of GDDR5 memory
Configurable to NVIDIA GeForce GTX 780M with 4GB 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 by 1600 pixels) on an external display
Support for extended desktop and video mirroring modes
Support for Target Display Mode via the Thunderbolt port using a Thunderbolt to Thunderbolt cable (sold separately)
Headphone/optical digital audio output (minijack)
Support for Apple iPhone headset with microphone
Connections and Expansion:
SDXC card slot
Four USB 3 ports (compatible with USB 2)
Two Thunderbolt ports
Mini DisplayPort output with support for DVI, VGA, and dual-link DVI (adapters sold separately)
10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)
Kensington lock slot
Apple Wireless Keyboard
Full-size keyboard with 78 (U.S.) or 79 (ISO) keys, including 12 function keys and 4 arrow keys (inverted “T” arrangement)
Smooth, seamless Multi-Touch surface with support for simple gestures (scrolling and swiping). Click and double-click anywhere. Ambidextrous construction accommodates left- and right-handed users.
802.11ac Wi-Fi wireless networking;2 IEEE 802.11a/b/g/n compatible
Bluetooth 4.0 wireless technology