With 14.7M pixels and a 5120x2880 resolution, the iMac with Retina 5K display has seven times the resolution of a standard HDTV and 67% more pixels than a 4K display Improved contrast for brighter whites and darker blacks Full lamination of the display cover glass creates a brilliant display that's 75% less reflective The extremely precise antireflective coating allows uncompromised vibrant, accurate colors to show through Next-generation graphicsThe AMD Radeon R9 M290 graphics processor with 2GB of GDDR5 memory provides jaw-dropping graphics performance Amazing ultrathin designiMac has a stunningly thin, gorgeous aluminum and glass design that is only 5mm thick at its edge Packs a remarkably powerful computer into an amazingly thin enclosure The fully integrated design takes up very little space, the stand is just 6.9" deep on the 21.5" models and 8" deep on the 27" models Fourth-generation Intel Core i5 processorsAll models feature fourth-generation dual-core or quad-core Intel Core i5 processors with Turbo Boost - delivering great performance while using less energy High-speed I/OFour USB 3 ports for 10 times faster performance than USB 2.0 Two Thunderbolt 2 ports (Mini DisplayPort output, support for DVI, VGA and dual-link DVI with adapters, sold separately) 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector) SDXC Card slot 802.11ac Wi-FI; IEEE 802.11a/b/g/n compatible Bluetooth 4.0 Product Details 3.3GHz quad-core Intel Core i5 Turbo Boost up to 3.7GHz 8GB (two 4GB) me...