Kingston HyperX Beast 16 GB Kit (4x4 GB) 1866MHz DDR3 PC3-15000 Non-ECC CL9 DIMM XMP Desktop Memory KHX18C9T3K4/16X 16GB Kit (4x4GB) DDR3 XMP Desktop Memory Unique black heatspreader 100-percent factory tested XMP profiles - factory configured for best maximum performance Non-ECC 1866MHz 240-pin Unbuffered DIMM Lifetime warranty, free technical support