Apple Computer , iMac 21.5-inch 3.2/3.06 GHz Core i3 (i3-540, i3-550), iMac 21.5-inch 3.06 GHz Core i5 (i5-680), iMac 27-inch 3.2 GHz Core i3 (i3-550), iMac 27-inch 2.8/3.6 GHz Core i5 (i5-760, i5-680), iMac 27-inch 2.93 GHz Core i7 (i7-870), Order Number, MC508LL/A, MC509LL/A, BTO/CTO, MC510LL/A, MC511LL/A, BTO/CTO, Model Number, A1311, A1312, Model Year, Mid 2010, Part Name, Memory 2GB DDR3 1333 MHz, Manufacture Part Number, N/A, EMC Number, EMC 2389, EMC 2390, EEE Code, N/A, Compatible Apple Computer, iMac (21.5-inch, Mid 2010), iMac (27-inch, Mid 2010), ,
Order you product here: 661-5528 Memory 2GB DDR3 for iMac 21.5/27 inch Mid 2010 A1311 A1312 MC508LL/A, MC509LL/A, MC510LL/A, MC511LL/A, BTO/CTO, 661-5528
source http://info.applepartsellers.com/661-5528-memory-2gb-ddr3-for-imac-21-5-27-inch-mid-2010-a1311-a1312-mc508ll-a-mc509ll-a-mc510ll-a-mc511ll-a-bto-cto