The Kingston 4GB DDR3 DIMM KHX1866C9D3/4G Desktop Memory RAM is a high-quality memory module designed for desktop computers. With a capacity of 4GB and a bus speed of PC3-12800 (DDR3-1600), this memory upgrade ensures smooth and efficient performance for your system. Made in the United States and backed by a lifetime manufacturer warranty, this Kingston RAM module is a reliable and long-lasting option for enhancing your computer's memory capacity.