AddOn 16GB PC3-12800 DDR3-1600MHz ECC Registered CL11 240-Pin DIMM 1.35V Low Voltage Dual Rank Memory Module. The 713985-B21-AM AddOn memory module features 16GB of PC3-12800 DDR3 RAM, operating at 1600MHz with ECC for enhanced data integrity. This registered, dual-rank module has a CAS latency of CL11 and a 240-pin DIMM form factor. Designed for reliability and efficiency, it runs at a low voltage of 1.35V, making it an ideal choice for servers and workstations requiring stable, high-performance memory.