Mobility Radeon HD 4000 series

The following mobile GPU cards or chipsets from the Mobility Radeon HD 4000 series were developed by ATI Technologies (which had been acquired by AMD) and incorporated by Apple into iMacs that were released in 2009 and 2010:

Mobile GPUs

 * Radeon HD 4670M — Late 2009 and Mid 2010 iMac
 * Radeon HD 4850M — Late 2009 iMac