2pcs 4GB DDR3, 1600MHz, Non-ECC, CL11, 1R, X8, 1.5V, Unbuffered, DIMM, 240-pin Lifetime exchange or repair warranty against manufacturing defects. Brand Computer Memory Solutions 30 Day money back guarantee We don't use Generic brands to avoid incompatibilities Gateway SX2185-UR21, SX2185-UR24, SX2855-UB22P MAX MEMORY 8GB SOCKETS 2