1pcs of 4GB PC3-12800 DDR3-1600 CL11 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 Max Memory: 8 GB Sockets: 2 Compatible with: HP Pavilion g6-2125tx, g6-2123us, g6-2106nr, g6-2104so