AddOn Memory Upgrades 16GB PC3-8500 DDR3-1066MHz ECC Registered CL7 240-Pin DIMM 1.35V Low Voltage Quad Rank Memory Module. The AM1066D3QRLPR/16G from AddOn is a 16GB memory upgrade module designed for high-performance systems. This 240-pin DIMM operates at 1066MHz with PC3-8500 compliance, offering ECC registered technology for enhanced data integrity. With a low voltage of 1.35V and quad rank configuration, this DDR3 module ensures efficient, reliable performance and is ideal for servers and workstations requiring robust memory solutions.