The 64GB DDR4 2666Mhz SODIMM Memory Upgrade Kit (2 x 32GB) from OWC features a total capacity of 64GB, which is made up of two 32GB modules. It features a clock speed of 2666 MHz. This non-ECC module has a 260-pin DIMM form factor and is dual-ranked. It operates using 1.2V. Plus, the memory module is backed by a lifetime limited manufacturers warranty.
eBay