Corsair CML4GX3M1A1600C9 Vengeance LP 4GB (1x4GB) DDR3 1600 MHZ (PC3 12800) Desktop Memory 1.5V Density: 4GB (1x4GB Module) Speed: 1600MHz Timing: 9-9-9-24 Voltage: 1.5V Format: DIMM Pin Out: 240 Pin Limited Lifetime Warranty. Memory Type: DDR3; Speed: 1600MHz