Kingston Hyper X 8GB (2x4GB Modules) 1866MHz DDR3 XMP Desktop Memory (KHX1866C9D3K2/8GX) 8GB Kit (2x4GB modules) of DDR3 Desktop Memory XMP 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 Unbuffered 1866MHz CL9 240-pin DIMM type