Apple Computer, MacBook Pro 13-inch 2.3/2.4 GHz Core i5 (i5-2415M, i5-2435M), MacBook Pro 13-inch 2.7/2.8 GHz Core i7 (i7-2620M, i7-2640M), Model Year, Early 2011, Late 2011, Part Name, Memory 4GB DDR3 (SDRAM), Manufacture Part Number, N/A, Compatible Apple Order Number, MD313LL/A, MD314LL/A, MC700LL/A, MC724LL/A, Compatible Model Number, A1278, EMC Number, EMC 2419, EMC 2555, EEE Code, N/A, Compatible Apple Computer Family, MacBook Pro (13-inch, Early 2011), MacBook Pro (13-inch, Late 2011)
Order you product here: 661-5861 Memory 4GB DDR3 (SDRAM) for MacBook Pro 13-inch Early 2010-Late 2011 A1278 MD313LL/A, MD314LL/A MC700LL/A, MC724LL/A, 661-5861
source http://info.applepartsellers.com/661-5861-memory-4gb-ddr3-sdram-for-macbook-pro-13-inch-early-2010-late-2011-a1278-md313ll-a-md314ll-a-mc700ll-a-mc724ll-a