Kingston HyperX 4 GB (2 x 2 GB Module) 800MHz DDR2 Desktop Memory - KHX6400D2LLK2/4G 4 GB of 800MHz DDR2 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 240-pin DIMM type