AddOn 16GB PC3-14900 DDR3-1866MHz ECC Registered CL13 240-Pin DIMM 1Gx4 Dual Rank Memory Module. The AddOn 708641-B21-AM memory module is a high-performance 16GB DDR3-1866MHz ECC Registered DIMM. Featuring CL13 latency and utilizing 240-pin technology with 1Gx4 dual rank configuration, it ensures reliable and efficient operation in servers and workstations. Ideal for enhancing system performance and stability, this module meets rigorous ECC (Error Correction Code) standards for data integrity, making it suitable for critical computing environments.