Kingston HyperX Genesis 4 GB Kit (2x2 GB Modules) 1866MHz DDR3 PC3-15000 240-Pin Non-ECC CL9 1.65V DIMM XMP Desktop Memory KHX1866C9D3K2/4GX 4GB Kit (2x2 GB Modules) 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 1866MHz 240-pin CL9 Unbuffered DIMM Intel XMP Ready