The iMac is a line of Macintosh desktop computers released by Apple Inc. The current Apple iMac provides either an Intel Core 2 Duo, Intel Core i5, or Intel Core i7 CPU, nVidia GeForce 9400M integrated graphic card or an ATI Radeon HD 4670 with options to update to the ATI Radeon HD, available for the 27 inches model only, and an alternative of glossy 21.5" or a 27" LCD displays.
In early February 2006, Apple affirmed reports of video display troubles on the new Intel based iMacs. At the replaying of a video on Apple's Front Row browser, some 20 inches iMacs proved random horizontal lines, ghosting, video tearing and other bugs. The problem was solved with a software upgrade.
In late 2006, Apple released a new version of the iMac which included a Core 2 Duo chip and a cheaper price. Apple added a new 24 inches model with a resolution of 1920 x 1200, WUXGA, making it the first iMac that was capable to display 1080 pixels content at a full resolution, and a VESA Flat Display Mounting Interface. Except for the 17 inches 1.83 GHz CPU model, this version also had an 802.11n draft card.
While the elder  iMac models had a white polycarbonate case, same  as iMac G5, this generation has a case shaped like Apple's Cinema Displays but as  styling as the iPhone. In addition, the iMac line is now produced using the same unibody structure as the MacBook Pro. Former aluminium iMac models had a black back made from plastic, but the actual model has an aluminium back extended with the front aluminum plate.
In March of 2009, Apple released a some minor brush up of the iMac class. Changes enclosed a fourth USB port, the removal of the Fire Wire 400 port, leaving only the FireWire 800 port, and a bit redesigned case. The outside design was nearly identical to the elder Intel-based iMacs. This line contains  a  20 inches configuration and three 24 inches configurations, instead of 2 at each monitor size as the previous. Apple Inc. doubled the usual RAM and hard disk capacity on all models, moving the memory to the DDR3 specification. This changes also brought in a new littler and more succinct Apple Keyboard in a QWERTY system that excluded the num keypads.
In October of 2009, a 16:9 aspect ratio display was introduced in 21.5 inches and 27 inches models, taking the place of the 20 inches and 24 inches screens of the elder generation. Video card options completely changed to ATI, save for the classic onboard nVidia card in the base model. The iMac's CPU selection attended a major increase. Existing Core 2 Duo technology provided higher speed on the lower models, and Intel's new Core i5 and Core i7 chips are now accessible in the higher end models, representing the 1st quad-core iMac. Default RAM memory has as well been increased all over the iMac line. With the produce and the release  of the larger displays, Apple doubled the number of memory slots from 2 to 4. Accordingly, the maximum memory capacity was also doubled up to 16GB. The current iMac comes with the wireless Apple Magic Mouse, wireless Apple Keyboard, Bluetooth v 2.0 and AirPort cards, an internal iSight camera, and a power electric cord.
The available processors are at 2.66GHz, 2.93GHz, or 3.06GHz Intel Core 2 Duo processor with 6 MB shared L2 cache memory at full processor speed and 1066 MHz front side bus, Replaced by Intel Direct Media Interface 2.5GT/s available for high-end 27" only.
The video card can be, optional, found as nVidia GeForce 9400M with 256MB shared with main memory for the low-end 21.5" only, or ATI Radeon HD 4670 with 256MB of GDDR3 SDRAM or ATI Radeon HD 4850 with 512MB of GDDR3 SDRAM for 27 inches only.
Wireless-N functionality demands the AirPort Extreme Wireless-N Router, which comprises wireless-N enabler software to be installed on user's iMac. In place of this, the enabler software may be buy from Apple separately. The optical drive speeds are the maximum possible for every drive.
In 2008, a lawsuit action was registered against Apple Inc. in San Jose by Kabateck Brown Kellner, LLP, demanding that Apple is betraying consumers by claiming that both the 20 inches and 24 inches iMac are able of displaying hundreds of colors at all resolutions, when the 20 inch models are only able to display 262,144 colors. The 20 inches screens use 6 bit twisted film (TN) LCD display, which the complainant claims that it is the "least expensive of its type," sporting a not that wider viewing angle than the display of the 24 inches model, lower color depth, lower color accuracy and greater susceptibleness to wash out.
