Hynix original 16GB (2 x 8GB), 204-pin SODIMM, DDR3 PC3L-12800, 1600MHz memory module Module Size: 16GB (8GBx2) Package: 204-pin SODIMM Feature: DDR3 PC3L-12800 Specs: DDR3 PC3L-12800 , CL=11 , Unbuffered , NON-ECC , DDR3-1600 , 1.35V Lifetime warranty. For Windows laptops and PCs, please make sure, your machine can support 8GB ram into one memory slot.Also make sure, your windows is 64bit, as 32bit Windows OS has limitations and can support 4GB ram ONLY.