Kingston Technology HyperX Red 8GB Kit (2x4GB) 1333MHz 9-9-9 1.5V DDR3 PC3-10666 Non-Ecc DIMM Motherboard Memory KHX13C9B1RK2/8 8GB Kit (2x4GB Modules) of DDR3 Desktop Memory Features HyperX Red heat spreader for greater heat dissipation Non-ECC 1333MHz 240-pin CL9 Unbuffered DIMM Compatible with P55, H67, P67, Z68, Z77and H61 Intel chipsets; as well as A75, A87, A88, A89, A78 and E35 AMD chipsets Compatible - tested with all popular brands of motherboards and Reliable - 100-percent factory tested Guaranteed - lifetime warranty, free technical support