Corsair CMSO4GX3M1C1600C11 4GB (1x4GB) 1600MHz PC3-12800 204-Pin DDR3 SODIMM Laptop Memory 1.35V 4GB Module (1x4GB) DDR3L 1600MHz SODIMM 1600MHz, 11-11-11-28 latency Format: SODIMM, Pin Out: 204 Pin, Voltage: 1.35V (also supports 1.5V) Limited Lifetime Warranty