The current line of iMacs are distinguished by the usage of Intel processors as opposed to the older, slower PowerPC processors. Visually, the new iMacs are distinguished by their aluminum casing and widescreen display. Initially released in 2006, the most current model was released in mid 2011, with a variety of different re-releases in that time, with different screen sizes, processors, and hardware adaptability.

Wikipedia: iMac Intel

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