The Samsung M378B5173DB0-CK0 4GB DDR3-1600 PC3-12800U 1Rx8 Desktop Memory Module is a high-quality memory module designed for desktop computers. With a total capacity of 4GB and a bus speed of PC3-12800 (DDR3-1600), it offers fast and efficient performance for upgrading or replacing existing memory modules. The DIMM form factor and DDR3 SDRAM type ensure compatibility with a wide range of desktop systems. This unit, packaged in a single PC quantity, provides a reliable and stable memory solution for enhancing the overall performance of your computer.