The CT4K16G4WFD8213 from Crucial is a kit of four DDR4 memory modules, each offering 16GB of memory, combining for a total of 64GB. Designed with ECC (Error Correcting Code) technology, these UDIMM modules enhance your system's reliability by automatically detecting and correcting errors, which is essential for mission-critical systems such as servers. Operating at a speed of 2133 MHz, they ensure smooth and efficient performance for demanding applications and workloads. These modules comply with the PC4-17000 standard and come with 288 pins, making them widely compatible with many motherboards that support DDR4 2133 modules. Crucial is a brand trusted by professionals for its high-quality and reliability, making this kit an excellent investment for users seeking to upgrade their system's memory capacity and performance.