Kingston HyperX Beast 8 GB Kit (2x4 GB) 2133MHz DDR3 PC3-17000 Non-ECC CL11 DIMM XMP Desktop Memory KHX21C11T3K2/8X 8GB Kit (2x4GB) DDR3 XMP Desktop Memory Unique black heatspreader 100-percent factory tested XMP profiles - factory configured for best maximum performance Non-ECC 2133MHz 240-pin Unbuffered DIMM Lifetime warranty, free technical support