2pcs of 8GB PC3-12800 1600mhz single or daul rank 16c 256x8 204-pin SDRAM SODIMM. 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 supported = 16GB Sockets: 2 If 4GB is installed, the recognized memory may be reduced to 3.5GB or less (depending on system configuration and memory allocation). Maximum configurations require a 64-bit operating system. Systems based on Intel GL40 chipset supports up to 4GB maximum. Compatible with: HP/Compaq Pavilion 20-b010, 20-b011, 20-b013w, 20-b014