This lot includes four Samsung M393B2G70DB0-CK0Q2 PC3 SDRAM modules, each with a capacity of 16GB for a total memory of 64GB. These modules have a form factor of DIMM and a bus speed of PC3-12800R, making them ideal for use in servers. The memory features of these modules include memory and registered technology, and they have 240 pins. These Samsung modules are designed for server use and are not recommended for desktop use. Buy with confidence knowing you are getting high-quality memory from a trusted brand.