This DDR3 PC10666 4GB has a latency of 9-9-9-24 and test voltage of 1.5 volts. The PCB is a 6 layer PCB, the memory is unbuffered and the error checking is non-ECC. The PC10666 4GB is 240-pin DIMM and compatible with the following motherboard chipsets Intel X48, Intel P45, Intel X38, Intel P35.