2pcs 4GB DDR3, 1600MHz, Non-ECC, CL11, 1R, X8, 1.5V, Unbuffered, DIMM, 240-pin Lifetime exchange or repair warranty against manufacturing defects. 30 Day money back guarantee We don't use Generic brands to avoid incompatibilities Gateway SX2855-UR20P, SX2855-UR21P, SX2865-UR26 MAX MEMORY 8GB SOCKETS 2