This Samsung DDR4 SDRAM module with ECC memory features a total capacity of 16GB and a bus speed of PC4-21300 (DDR4-2666). It is designed for use in server/desktop memory and has a UDIMM form factor with 288 pins. The module comes with one 16GB capacity per module. This memory module is ideal for those looking to upgrade their server or desktop's memory performance. The module is brand new and in excellent working condition.