Kingston Technology HyperX Predator 8GB Kit (2x4GB) 2666MHz DDR3 CL11 DIMM Motherboard Memory XMP T2 Series KHX26C11T2K2/8X 8 GB Kit (2x4 GB Modules) of DDR3 Desktop Memory Ultra-responsive multitasking Higher performance and an overall faster system Dense heat spreader for ultimate heat dissipation Non-ECC 2666MHz 240-pin CL11 Unbuffered DIMM Intel XMP Certified Compatible - tested with all popular brands of motherboards and Reliable - 100-percent factory tested Guaranteed - lifetime warranty, free technical support