Kingston ValueRAM 4GB DDR3 SDRAM Memory Module - For Desktop PC - 4 GB - DDR3-1600/PC3-12800 DDR3 SDRAM - CL11 - 1.50 V - Non-ECC - Unbuffered - 240-pin - DIMM

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