4GB DDR4 2666 (PC4 21300) SODIMM Laptop Memory by NEMIX RAM at Amazon.com
PROVANTAGE: Axiom Upgrades AA086413-AX 4GB DDR4-2666 SODIMM for Dell AA086413
A-Tech 4GB Memory RAM for Dell Latitude 3580 - DDR4 2666MHz PC4-21300 Non ECC SO-DIMM 1Rx16 1.2V - Single Laptop & Notebook Upgrade Module (Replacement for AA086413) at Amazon.com