OWC 16GB (2x 8GB) 1333Mhz PC3-10600 DDR3 SO-DIMM 204-Pin Memory Upgrade Kit 2 x 8GB (16.0GB), 1333MHZ, DDR3 SO-DIMM, PC3-10600, 204 Pin, 1.5V, Non ECC, Dual Rank, Non Parity, Memory Upgrade Kit Memory Upgrade Module For Mac Memory Upgrade Module For 2011 MacBook Pro, Mid 2010/2011 21.5 inch & 27 inch iMac Models, 2011 Mac mini and PC Laptops compatible with Intel / AMD Compatible with iMac Models: Mid 2011 27inch iMac (Model ID:iMac12,2); Mid 2010 27inch iMac (Model ID: iMac11,3 except i3 models); Mid 2011 21.5-inch iMac (Model ID:iMac12,1) 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 iMac (27-inch Mid 2011)(May, 2011) Model ID: iMac12,2 (2.7GHz i5, 3.1GHz i5, 3.4GHz i7) iMac (27-inch Mid 2010)(July, 2010) Model ID: iMac11,3 (2.8GHz, 2.93GHz, 3.2GHz, 3.6GHz) iMac (21.5-inch Late 2011)August, 2011) Model ID: iMac12,1 (3.1GHz i3) iMac (21.5-inch Mid 2011)(May, 2011) Model ID: iMac12,1 (2.5GHz i5, 2.7GHz i5, 2.8GHz i7) iMac (21.5-inch Mid 2010)(July, 2010) Model ID: iMac11,2 (3.06GHz, 3.2GHz, 3.6GHz) Mac mini (Mid 2011) Model ID: Macmini5,1 &amp; Macmini5,2 (2.3GHz, 2.5GHz, 2.7GHz) (July 2011) Mac mini (Mid 2011 Server) Model ID: Macmini5,3 (2.0GHz )(July, 2011) MacBook Pro (17-inch 2011)(October, 2011)Model ID: MacBookPro8,3(2.4GHz, 2.5GHz) MacBook Pro (17-inch Early 2011)(February, 2011)Model ID: MacBookPro8,3(2.2GHz, 2.3GHz) MacBook Pro (15-inch 2011)(October, 2011)Model ID: MacBookPro8,2(2.2GHz, 2.4GHz, 2.5GHz) MacBook Pro (15-inch Early 2011)(February, 2011)Model ID: MacBookPro8,2(2.0GHz, 2.2GHz, 2.3GHz) MacBook Pro (13-inch 2011)(October, 2011)Model ID: MacBookPro8,1(2.4GHz, 2.8GHz) MacBook Pro (13-inch Early 2011)(February, 2011)Model ID: MacBookPro8,1(2.3GHz, 2.7GHz) with Intel / AMD Process based PCs