Corsair's mainstream DDR2 4GB memory kit for maximum reliability and performance. The XMS brand family is Corsair's mainstream line of performance memory. These modules allow users to experience outstanding memory performance and stability. Density: 4GB (2 x 2GB Module); Speed: 800MHz; Timing: 5-5-5-18; Type: DDR2; Format: DIMM; Pin Out: 240 Pin; Voltage: 1.8V