iMac 21.5" A1311 iMac10,1 Late 2009: MB950LL/A (3.06 GHz Core 2 Duo) iMac10,1 Late 2009: MC413LL/A (3.06GHz Core 2 Duo) iMac10,1 Late 2009: MB950LL/A (3.33 GHz Core 2 Duo) iMac11,2 Mid 2010: MC508LL/A (3.06 GHz Core i3) iMac11,2 Mid 2010: MC509LL/A (3.2 GHz Core i3) iMac11,2 Mid 2010: MC509LL/A (3.6 GHz Core i5) iMac12,1 Mid 2011: MC309LL/A (2.5 GHz Core i5) iMac12,1 Mid 2011: MC812LL/A (2.7 GHz Core i7) iMac12,1 Mid 2011: MC812LL/A (2.8 GHz Core i7)iMac 27" A1312 iMac10,1 Late 2009: MB952LL/A (3.06 GHz Core 2 Duo) iMac10,1 Late 2009: MB952LL/A (3.33 GHz Core 2 Duo) iMac11,1 Late 2009: MB953LL/A (2.66 GHz Core i5) iMac11,1 Late 2009: MB953LL/A (2.8 GHz Core i7) iMac11,3 Mid 2010: MC510LL/A (3.2 GHz Core i3) iMac11,3 Mid 2010: MC511LL/A (2.8 GHz Core i5) iMac11,3 Mid 2010: MC511LL/A (3.6 GHz Core i5) iMac11,3 Mid 2010: MC511LL/A (2.93 GHz Core i7) iMac12,2 Mid 2011: MC813LL/A (2.7 GHz Core i5) iMac12,2 Mid 2011: MC814LL/A (3.1 GHz Core i5) iMac12,2 Mid 2011: MD063LL/A (3.4 GHz Core i7)