MacMemory Net 4GB DDR3-1333 PC3-10600 DDR3 1333Mhz SO-DIMM for Apple iMac (1x 4GB) All MacMemory Net products are sold exclusively by the MacMemory Net Store. MacMemory Net has NOT authorized any Amazon Sellers to list the MacMemory Net brand for resale. MacMemory Net is unable to warranty any product that has NOT been purchased from the MacMemory Net Store. 4GB DDR3-1333 MHz SO-DIMM (1x4GB) for iMac 11,3 (i3,i5 ,i7) 12,1 and 12,2 Optimized and rigorously tested for Macs