The iMac is a series of Macintosh desktop computers offered by Apple Inc. The current Apple iMac features either an Intel Core i5 or Core i7 processor, Intel Iris, Nvidia GeForce 700 Series, or AMD Radeon R9 M200 Series graphics cards, and a choice of either a 21.5" or 27" LED-LCD display.Previous iMac models featured either a white polycarbonate enclosure or an aluminium enclosure. The late 2009 iMac model featured a unibody aluminium enclosure, which can still be seen on the current model.