MacMemory Net 16GB DDR3-1333 ECC DIMM PC3-10600 DDR3 1333Mhz Kit for Apple Mac Pro (2x 8GB) 16GB DDR3-1333 MHz SO-DIMM (2x8GB) for Mac Pro 5,1 6-Core and 12-Core All our Mac Pro DIMMs are Error-correcting Code (ECC) memory Optimized and rigorously tested for Macs All Ramjet products are sold exclusively by the Ramjet Store