AddOn 16GB PC3-12800 DDR3-1600MHz ECC Registered CL11 240-Pin DIMM Dual Rank Memory Module. The A2Z52AA-AM AddOn 16GB PC3-12800 DDR3-1600MHz ECC Registered CL11 240-Pin DIMM Dual Rank Memory Module is a high-performance RAM upgrade suitable for servers and workstations. It offers 16GB of memory capacity with DDR3-1600MHz speed, ECC (Error-Correcting Code) for data integrity, and operates at CL11 latency. Designed for stability and reliability, it features a 240-pin DIMM form factor, making it compatible with various server and workstation motherboards requiring ECC registered memory.