Samsung 2GB DDR3 Memory SO-DIMM 204pin PC3-12800S 1600MHz M471B5773CHS-CK0 Module Size: 2GB Package: 204-pin SODIMM Feature: DDR3 PC3-12800 Specs: DDR3 PC3-12800 , CL=11 , Unbuffered , NON-ECC , DDR3-1600 , 1.5V , 256Meg x 64 Lifetime warranty. Backward compatible to PC3 10600, 1333MHz.