OWC 4.0GB (2X 2GB) 1333Mhz 204-Pin DDR3 SO-DIMM PC3-10600 CL9 Memory Upgrade Kit, (OWC1333DDR3S04S)

2 x 2GB (4.0GB), 1333MHZ, DDR3 SO-DIMM, PC3-10600, 204 Pin, 1.5V, 128Meg x 8, Non ECC, Dual Rank, Non Parity, Memory Upgrade Kit Memory Upgrade Module Compatible with Mac Memory Upgrade Module Compatible With 2011 MacBook Pro, Mid 2010/2011 21.5 inch & 27 inch iMac Models, 2011 Mac mini and PC Laptops Compatible with iMac Models: Mid 2011 27 inch iMac (Model ID: iMac12,2); Mid 2010 27-inch iMac (Model ID: iMac11,3); Late 2011 21.5-inch (iMac Model ID: iMac12,1); Mid 2011 21.5-inch iMac (Model ID: iMac12,1); and Mid 2010 21.5-inch iMac (Model ID: iMac11,2) Compatible with Mac mini: Mid 2011 Model ID: Macmini5,1 & Macmini5,2 and Mid 2011 Server Model ID: Macmini5,3 Compatible with MacBook Pro: 13inch, 15inch, 17inch 2011 Models:  MacBookPro8,3  MacBookPro8,2  MacBookPro8,1