The iMac "Core i7" 3.5 27-Inch Aluminum (Late 2013-Present) technically is a "configure-to-order" iMac and this iMac was configured to highest of Available specs except for default 8GB RAM! This Studio standard iMac is the most powerful Non- Retina iMac 27” available!
iMac 27-inch, 3.5GHz CTO (Configure to Order)
Processor:3.5GHz Quad-core Intel Core i7, Turbo Boost up to 3.9GHz
Display:27-inch (diagonal) LED-backlit display with IPS technology; 2560-by-1440 resolution with support for millions of colors.
RAM:8GB 1600MHz DDR3 SDRAM - 2x4GB
Graphics: NVIDIA GeForce GTX 780M 4GB GDDR5
Storage: 3TB Fusion Drive
Ports and bays: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)0/100/1000BASE-T Gigabit Ethernet (RJ-45 connector) Kensington lock slot
Video Support & 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
Audio:Stereo speakers Dual microphones Headphone port
Wireless: 802.11ac Wi-Fi wireless networking; IEEE 802.11a/b/g/n compatible Bluetooth 4.0 wireless technology
Software: OS X Yosemite 10.10.3;
iLife: iPhoto, iMovie, and GarageBand
Also included: Apple Wireless Keyboard, Apple Magic Mouse
Apple Care: Apple Care Protection Plan (Extended warranty)