The Kingston 4GB DDR3 SDRAM Memory Module KCP316NS8/4 is a single module with a total capacity of 4GB. It has a form factor of SDIMM and operates at a bus speed of PC3-12800 (DDR3-1600). The memory module is designed for non-ECC (Error Correcting Code) applications, making it suitable for a wide range of computing tasks. With its reliable brand reputation and specific model number, this memory module is a reliable choice for upgrading or replacing existing RAM in computer systems.