Corsair Vengeance 4GB DDR3 SDRAM Memory Module - 4 GB (1 x 4GB) - DDR3-1600/PC3-12800 DDR3 SDRAM - 1600 MHz - CL9 - Non-ECC - Unbuffered - 240-pin - DIMM

Up to 1600 MHz speed for smooth computer performance 4 GB memory allows you to have more programs open at a time 240-pin-pin DDR3-1600/PC3-12800 interface synchronizes electrical and clock signals for an efficient data transfer rate