This high quality Total Micro 8GB DDR4 2666MHz PC4-19200 260-Pin SODIMM module meets or exceeds OEM specs. For HP ElitBook 745 G4, 745 G5, 755 G4, 755 G5, 820 G4, 840 G4, 840 G5, 840r G4, 850 G4, 850 G5, Zbook 15 G5, 17 G5. Lifetime limited warranty