Apple Computer iMac 21.5-inch 2.7/2.9 GHz Core i5 (i5-4570R, i5-4570S) iMac 21.5-inch 3.1 GHz Core i7 (i7-4770S) Compatible Order Number ME086LL/A, ME087LL/A, BTO/CTO Compatible Model Number A1418 Model Year Late 2013 Part Name Memory 8GB Manufacture Part Number N/A EMC Number EMC 2638 EMC 2742 EEE Code N/A Compatible Apple Computer iMac (21.5-inch, Late 2013)