Crucial Basics 4GB DDR4 1.2v 2666Mhz CL19 SODIMM RAM Memory Module for Laptops and Notebooks

Speeds start at 2133 MT/s ~ 2666 MT/sIncrease bandwidth by up to 30 percentReduce power

Crucial RAM 8GB DDR4 2666 MHz CL19 Laptop Memory CT8G4SFRA266

8GB, DDR4 RAMMemory Speed-2666MHz /PC4-21300 (2666MHz)ECC Type = Non-ECC, Form Factor = SODIMM, Pin Count

Increase bandwidth by up to 30%Reduce power consumption by up to 40% and extend battery