[Pre Order - allow extra time] OWC 64GB DDR4 2666 MHz SO-DIMM Memory Upgrade (2 x 32GB) 64GB (2 x 32GB) Capacity, 2666 MHz Clock Speed, PC4-21300, 260-Pin SO-DIMM, Low-Noise 8-Layer PCB, Voltage: 1.2V, RoHS Certified