A-Tech 8GB Memory RAM for Dell Latitude 3400 - DDR4 2666MHz PC4-21300 Non ECC SO-DIMM 1Rx8 1.2V - Single Laptop & Notebook Upgrade Module (Replacement for SNPHYXPXC/8G) at Amazon.com
Kimtigo DDR4 2666 8G Laptop Dram 2666MHz (PC4-21300) CL19 (Compatible with 2400MHz or 2133MHz) 1.2V Notebook 1Rx8 Single Rank 260 Pin SODIMM Laptop PC Computer Memory RAM(8GB) at Amazon.com
PNY Performance 8GB DDR4 DRAM 2666MHz (PC4-21300) CL19 (Compatible with 2400MHz or 2133MHz) 1.2V Notebook/Laptop (SODIMM) Computer Memory RAM – MN8GSD42666 at Amazon.com