desktop computers designed and built by Apple Inc. It has been the primary part of Apple's consumer desktop offerings since its introduction in 1998, and has evolved through four distinct forms. In its original form, the iMac G3, the iMac was gum-drop or egg-shaped with a CRT monitor, mainly enclosed by colored, translucent plastic. The second major revision, the iMac G4, moved to a design of a hemispherical base containing all the main components and an LCD monitor on a freely moving arm attached to the top of the base. The iMac G5 and the Intel iMac placed all the components immediately behind the display, creating a slim unified design that tilts only up and down on a simple metal base. The current iMac shares the same form as the previous models, but is now thinner and uses anodized aluminum and black-bordered glass for its case.
2009 redesign
In October 2009, Apple released a refresh of the iMac line. An LED-backlit 16:9 widescreen was introduced in 21.5" and 27" models, replacing the 20" and 24" 16:10 aspect ratio screens of the previous generation. The 27" models also have a digital video input port to allow the system to serve as a display for other systems or devices. Video card options entirely switched to ATI, save for the standard onboard Nvidia card in the base model. The iMac's processor selection saw a significant increase. Existing Core 2 Duo technology offered speed bumps in the lower models, and Intel's new Core i5 and Core i7 chips are now available in the high end model, signifying the first quad-core iMac. Default RAM has also been increased across the iMac range. With the advent of larger screens, Apple doubled the number of memory slots from two to four. Consequently, the maximum memory capacity was also doubled (to 16GB).
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