Samsung Electronics Extreme Low Voltage 30nm SODIMM 4 Dual Channel Kit DDR3 1600 (PC3 12800) 204-Pin DDR3 SO-DIMM MV-3T2G3D/US Add 4 GB (kit contains two 2 GB modules) of memory to your DDR3-compatible laptop Engineered for dual-channel architecture Compatible with PC3-12800, PC3-10600, PC3-8500, PC3-6400 memory solutions Extreme low voltage--high performance with very low energy consumption for superior overclocking without large and expensive heatsinks Very Low Profile--two-thirds as wide as conventional memory modules Backed by a limited lifetime warranty 100% genuine Samsung components individually tested and certified From the #1 manufacturer of DRAM in the World