VisionTek 2 x 2GB PC3-12800 DDR3 1600MHz 240-pin DIMM Memory Module - 4 GB (2 x 2GB) - DDR3-1600/PC3-12800 DDR3 SDRAM - 1600 MHz - CL8 - 1.55 V - 240-pin - DIMM - Lifetime Warranty

Up to 1600 MHz speed with CL8 latency for smooth computer performance 4 GB of memory to refine your computers performance 240-pin-pin DDR3 SDRAM interface synchronizes electrical and clock signals for an efficient data transfer rate