KVR16S11S8/4 4GB 1600MHz DDR3 Non-ECC CL11 SODIMM SR X8 Standard 512M X 64 Non-ECC 1600MHz 204-pin Unbuffered SODIMM (DDR3, 1.5V, CL11, FBGA, Gold) Form Factor: Memory Module Pieces/Unit: 1 Warranty: Lifetime