OWC 16GB DDR4 2666 MHz SO-DIMM Memory Upgrade (2 x 8GB) 16GB (2 x 8GB) Capacity, 2666 MHz Clock Speed, PC4-21300, 260-Pin SO-DIMM, Low-Noise 8-Layer PCB, Voltage: 1.2V, RoHS Certified COMPUTER MEMORY-Computer Memory