16pc of 8GB DDR3L, 1600MHz, Non-ECC, CL11, 1R, X8, 1.35V, Unbuffered, SODIMM, 204-pin Genuine CMS brand, CMS is one of the most trusted names in the Computer Memory industry and this product carries a Lifetime Warranty from CMS Maximum Memory: 16GB Expansion: 2 Sockets COMPATIBLE WITH: Panasonic Toughbook 53 Mk3 CF-53 (Touchscreen) If 4GB is installed, the recognized memory may be reduced to 3.5GB or less with 32-bit operating system.(depending on system configuration and memory allocation). Maximum configurations require a 64-bit operating system.