The ADATA AD3U1600W4G11-B 4GB DDR3 PC3-1600 RAM module is a single DIMM memory module with a capacity of 4GB per module. It has a bus speed of PC3-12800 (DDR3-1600) and a form factor of DIMM. The module is non-ECC and has a total capacity of 4GB. With a length of 5.5 inches and a height of 1.5 inches, this RAM module is designed for computers and networking devices that require reliable memory components. The ADATA brand is known for its quality and performance in the tech industry, making this module a solid choice for enhancing your computer's memory capabilities.