Compatible with Apple 64GB Memory Kit (4x16GB) DDR3 PC3-14900 1866MHz CAS=13 ECC RDIMM Memory for Mac Pro (Late 2013) Apple 64GB Memory Kit (4x16GB) PC3-14900 DDR3-1866MHz ECC RDIMM Memory for Mac Pro (Late 2013) CAS13 ECC RDIMM Memory