This powerful SUPERMICRO KVR21R15D4K4/64 memory kit from Kingston consists of four 16GB DDR4 modules, totaling a massive 64GB of RAM, making it an excellent choice for high-end servers that require large memory capacities for heavy-duty computing tasks. Each module operates at the speed of 2133MHz under the PC4-17000R specification, offering greater bandwidth and improved power efficiency compared to DDR3 memory. These DDR4 modules are designed with a 2Rx4 configuration, meaning they have two ranks of four memory chips each, which optimizes their compatibility and performance in multi-channel memory setups. With ECC (Error-Correcting Code) and being of the Registered variety, they ensure reliability and stability by correcting data errors in real time, preventing system crashes and data corruption in enterprise environments. Ideal for data centers, large databases, and intensive applications, this memory kit supports the rigorous demands of business operations, ensuring seamless performance and scalability.