MacMemory Net 16GB DDR3-1066 PC3-8500 DDR3 1066Mhz SO-DIMM Kit for Apple iMac (4x 4GB) 16GB DDR3 1066MHz SO-DIMM (4x4GB) for iMac10,1 and iMac11,1 iMac Model Numbers A1312 and A1312 released in October 2009 Optimized and rigorously tested for Macs All Ramjet products are sold exclusively by the Ramjet Store