4GB Total memory using 1pc of 4GB 1DDR3, 1600MHz, Non-ECC, CL11, X8, 1.5V, Unbuffered, DIMM, 240-pin Lifetime warranty for exchange. BRAND CMS We don't use Generic modules to avoid incompatibility issues. Guaranteed to work or you get all of your money back including shipping. MAX MEMORY 16 GB SOCKETS 4 OR 2 COMPATIBLE WITH HP/Compaq ProDesk 400 G2