Crucial Retail's CT16G3ERSDD4186D is a high-capacity, high-speed DDR3-1866 module designed for use in server systems that require reliable and fast memory. With a specification of 2Gx72 ECC Reg/RDIMM and a total capacity of 16GB, this module operates at a frequency of 1866 MHz, adhering to the PC3-14900 standard. It incorporates ECC (Error-Correcting Code) technology, critical for preventing data corruption and ensuring server stability. Furthermore, it's designed in a 240-pin Registered DIMM configuration, with a 2Rx4 layout, meaning it has two ranks, each using x4 organization. Manufactured by Crucial, a brand known for its quality and reliability, the CT16G3ERSDD4186D utilizes 1Gx4 36C technology to provide optimal performance and compatibility with a wide range of server motherboards. It's an excellent choice for enterprises seeking to upgrade their server memory with a focus on reliability and performance.