Apple Computer iMac 21.5-inch 3.1 GHz Core i3 (i3-2100) Order Number MC978LL/A Model Number A1311 Model Year Late 2011 Part Name Memory 2GB DDR3 1333 MHz Manufacture Part Number N/A Compatible Apple Order Number MC978LL/A Compatible Apple Model Number A1311 EMC Number EMC 2496 EEE Code N/A Compatible Apple Computer iMac (21.5-inch, Late 2011)