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 Logic Board 3.1 GHz Manufacture Part Number 820-2641 Compatible Apple Order Number MC978LL/A Compatible Apple Model Number A1311 EMC Number EMC 2496 EEE Code DNY3, DP00 Compatible Apple Computer iMac (21.5-inch, Late 2011)