This Samsung 4GB DDR3 desktop memory module has been meticulously tested to ensure optimal performance. It is compatible with DIMM form factor, PC3-10600U (DDR3-1333) bus speed, and has 240 pins. With a total capacity of 4GB and a capacity per module of 4GB, this memory module is perfect for upgrading your computer's memory. The model number is M378B5273CH0-CH9 and it is manufactured by Samsung.