SAMSUNG 4GB RAM DDR4 PC4-2133P (PC4 17000) Laptop Notebook memory M471A5143DB0-CPB SAMSUNG 4GB RAM DDR4 PC4-2133P Laptop memory 4GB DDR4 1Rx8 PC4-2133P SA0 - 10 260 pin Speed: DDR4 2133Mhz (PC4 17000) 1.2V