Patriot Memory VIPER 4 Series 2666MHz (PC4 21300) 16GB Dual Channel DDR4 Kit PV416G266C5K Viper 4 Series DDR4 for Intel X99, Skylake, and later compatible platforms XMP 2.0 for no hassle overclocking and extreme performance Hand tested performance ICs It comes with 16GB (2 x 8GB) Quad Kit Custom designed high performance heat shield