64GB (4 X 16GB) Memory Upgrade Kit for Mac Pro 2013 PC3-14900 DDR3 ECC Registered 1866MHz 240 Pin 64GB OF MEMORY ( 4 X 16GB) WORKS IN 2012 AND 2013 MAC PRO MODULES 2048M x 72, Dual Rank ECC Registered Memory Module2048M x 72, Dual Rank ECC Registered Memory Module LIFETIME WARRANTY Apple Specified Thermal Sensor