iMac G3

The iMac G3 was released on July 18, 2001.

It had a PowerPC G3 CPU at 700MHz with a integrated FPU.

Also, it had 256MB of 168-pin PC100 SDRAM, which is expandable to 1GB.

It has a internal 13.8 Inch Display at a 800 by 600 or 1024 by 768 Pixel Resolution.

iMac G4

The iMac G4 was released on November 18, 2003.

It had a PowerPC G4 CPU at 1.25GHz with a integrated FPU.

Also, it had 256MB of  PC2700 DDR SDRAM, which is expandable to 2GB.

It has a internal 20 Inch TFT Active Matrix Display at a  1680 by 1050 Pixel Resolution.

iMac G5

The iMac G5 was released on October 12, 2005.

It had a PowerPC G5 CPU at 2.1GHz with a integrated FPU.

Also, it had 512MB of  PC2-4200 DDR2 SDRAM, which is expandable to 2.5GB.

It has a internal 20 Inch TFT Active Matrix Display at a  1680 by 1050 Pixel Resolution.

iMac Core 2 Duo

The iMac Core 2 Duo was released on October 20, 2009.

It had a Intel Core 2 Duo CPU at 3.33GHz with a integrated FPU.

Also, it had 4GB of 204-pin PC3-8500 DDR3 SDRAM, which is expandable to 16GB.

It has a internal 27 Inch 16:9 Widescreen LED-Backlit TFT Active Matrix Display at a 2560 by 1440 Pixel Resolution.

iMac Core 2 Extreme

The iMac Core 2 Extreme was released on August 7, 2007.

It had a Intel Core 2 Extreme CPU at 2.8GHz with a integrated FPU.

Also, it had 2GB of 200-pin PC2-5300 DDR2 SDRAM, which is expandable to 6GB.

It has a internal 24 Inch 750:1 Widescreen  TFT Active Matrix Display at a 1920 by 1200 Pixel Resolution.

iMac Aluminum Unibody

The iMac Aluminum Unibody was released on October 20, 2009.

It had a Intel Core i7 at 2.8GHz with a integrated FPU.

Also, it had 4GB of 204-pin PC3-8500 DDR3 SO-DIMM, which is expandable to 32GB.

It has a internal 27 Inch 750:1 Widescreen TFT LED-Backlit

Active Matrix Display at a 2560 by 1440 Pixel Resolution.

iMac Slim Aluminum Unibody

The iMac Slim Aluminum Unibody was released on June 5, 2017.

It had a Intel Core i5 at 2.3GHz with a integrated FPU.

Also, it had 8GB of PC4-17000 DDR4 SO-DIMM, which is expandable to 16GB.

It has a internal 21.5 Inch 16:9 Widescreen TFT LED-Backlit

Active Matrix Display at a 1920 by 1080 Pixel Resolution.

iMac Retina 4K

The iMac 4K was released on March 19, 2019.

It had a Intel Core i7 at 3.2GHz with a integrated FPU.

Also, it had 8GB of PC4-21300 DDR4 SO-DIMM, which is expandable to 32GB.

It has a internal 21.5 Inch 16:9 Widescreen TFT LED-Backlit

Active Matrix Display at a 4096 by 2304 Pixel Resolution.

iMac Retina 5K

The iMac 5K was released on March 19, 2019.

It had a Intel Core i9 at 3.6GHz with a integrated FPU.

Also, it had 8GB of 260-pin PC4-21300 DDR4 SO-DIMM, which is expandable to 128GB.

It has a internal 27 Inch 16:9 Widescreen TFT LED-Backlit

Active Matrix Display at a 5120 by 2880 Pixel Resolution.