Kingston Technology HyperX Red 4GB Kit (2 x 2GB) 1600MHz 9-9-9 1.65V DDR3 PC3-12800 Non-ECC DIMM Motherboard Memory KHX16C9B1RK2/4 4GB Module of DDR3 Desktop Memory Features HyperX Red heat spreader for greater heat dissipation Non-ECC 1600MHz 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