iMac (Retina 5K, 27-inch, Late 2013)
Display
◾27-inch (diagonal) Retina display with IPS technology;
◾5120‑by‑2880 resolution with support for millions of colors

Processor
◾3.5GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.9GHz)
Configurable to 4.0GHz quad-core Intel Core i7 (Turbo Boost up to 4.4GHz).

Memory
◾8GB (two 4GB) of 1600MHz DDR3 memory; four SO-DIMM slots, user accessible
Configurable to 16GB or 32GB.

Storage1
◾1TB Fusion Drive
Configurable to 3TB Fusion Drive or 256GB, 512GB, or 1TB of flash storage (SSD).

Graphics
◾AMD Radeon R9 M290X graphics processor with 2GB of GDDR5 memory
Configurable to AMD Radeon R9 M295X 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 3840 by 2160 pixels on an external display
◾Support for extended desktop and video mirroring modes

Audio
◾Stereo speakers
◾Dual microphones
◾Headphone port ◦Headphone/optical digital audio output (minijack)
◦Support for Apple iPhone headset with microphone