Manufacturer: G.Skill. This DDR2 PC6400 4GB Kit includes 2 x 2GB Sticks of RAM. The memory has a latency of 5-5-5-15 and test voltage of 1.8 volts.? The PCB is a 6 layer PCB, the memory is unbuffered and the error checking is non-ECC.? The PC6400 4GB Kit is 240-pin DIMM and compatible with the following motherboard chipsets Intel X48, Intel P45, Intel X38, Intel P35, Intel 965, Intel 975, nVidia n6xx I (for Inel series), nVidia n7xx I (for Intel series), nVidia nForce 5 series (590SLI, 570Ultra. Others for AM2) and nVidia n7xx series.