Kingston Technology Hyper X Red Limited Edition 4GB (1x4 GB Module) 1600MHz DDR3 PC3-12800 Non-ECC CL9 1.65V 240-Pin DIMM Desktop Memory KHX1600C9D3B1R/4G 4GB of DDR3 Desktop Memory Utilizes HyperX module with faster latency timing for higher performance and speed Specifically designed and tested for compatibility in various makes and models of desktop computers From the industry leader in PC memory Non-ECC 1600MHz 240-pin CL9 Unbuffered DIMM