IMac
Timeline of iMac and Macintosh models

IMac

Section Title: Timeline of iMac and Macintosh models
Table Section Text: None

Generation	iMac G3	iMac G4	iMac G5	iMac (Intel plastic)	iMac (aluminum)	iMac (aluminum unibody)	iMac (slim aluminum unibody)	iMac (w/ Retina display)

Slot loading iMac G3.	iMac G4 Sunflower.	iMac G5 Rev A.	Polycarbonate iMac.	Aluminium iMac.	Unibody iMac.	Slim edge unibody iMac.	Retina 4K & 5K iMac.

Display	15″ (13.8″ viewable) CRT	15″, 17″, or 20″ LCD	17″ or 20″ LCD	17″, 20″, or 24″ LCD	20″ or 24″ LCD	21.5" or 27" LED-LCD	21.5" or 27" LED-LCD	21.5" or 27" LED-LCD

Processor	PowerPC G3	PowerPC G4	PowerPC G5	Intel Core Duo/Intel Core 2 Duo	Intel Core 2 Duo	Intel Core 2 Duo/i3/i5/i7	Intel Core i5/i7	Intel Core i3/i5/i7/i9

Included HDD	4 GB to 60 GB	40 GB to 160 GB	40 GB to 500 GB	80 GB to 750 GB	250 GB to 1 TB	500 GB to 2 TB or 256 GB SSD	1 TB to 3 TB HDD, 1 TB to 3 TB Fusion Drive or 256 GB to 1 TB flash storage	1 TB to 3 TB HDD, 1 TB to 3 TB Fusion Drive or 256 GB to 2 TB flash storage

Included Mac OS version	8.1, 8.5, 8.6, 9.0, 9.1, 10.0	9.2, 10.1, 10.2, 10.3	10.3, 10.4	10.4	10.4, 10.5, 10.6	10.6, 10.7, 10.8	10.8, 10.9, 10.10, 10.11, 10.12, 10.13, 10.14	10.10, 10.11, 10.12, 10.13, 10.14

Release date	August 15, 1998	January 7, 2002	August 31, 2004	January 10, 2006	August 7, 2007	October 20, 2009	November 30, 2012 (21.5")/ January 2013 (27")	October 13, 2015 (21.5") / October 16, 2014 (27")

Discontinued	March 2003	July 2004	March 2006	August 2007	October 2009	October 2012	October 13, 2015 (27")	N/A

Sentence(s)

The 21.5-inch iMac was announced in October 2015.

final_sentence: The 21.5-inch iMac was announced in October 2015.