MacMemory Net 4GB DDR3-1066 PC3-8500 DDR3 1066Mhz SO-DIMM for Apple iMac (1x 4GB) 4GB DDR3-1066 MHz SO-DIMM (1x4GB) for iMac 11,3 (i3,i5 ,i7) 12,1 and 12,2 Optimized and rigorously tested for Macs All Ramjet products are sold exclusively by the Ramjet Store