Free Express Shipping! OWC 64GB DDR3 1866 MHz RDIMM Memory Kit (4 x 16GB, 2013 Mac Pro) 64GB (4 x 16GB) Capacity, 1866 MHz Clock Speed, PC3-14900, 240-pin RDIMM, 1.5V, CAS Latency CL=13, ECC, Registered, Apple Thermal Sensor Compatible, Module...