NEMIX RAM 64GB DDR4 2666 ECC RDIMM 4Rx4 CL19 1.2V 288-Pin Synology SA6400 memory upgrade

Synology SA6400 64GB DDR4 ECC RDIMM

This registered DDR4 module adds 64GB of ECC memory to a Synology SA6400 NAS. It targets administrators who need data integrity for file services, virtualization or backup workloads on that specific platform. The single-stick design leaves remaining slots free for future expansion. Buyers who want non-ECC memory or a different form factor cannot use this part.

Passive operation at 1.2V and CL19

The module runs at 1.2V with CAS latency 19 and no heat spreader, relying on chassis airflow for cooling. Registered buffering reduces electrical load on the memory controller, helping stability under sustained throughput. Power draw stays low because voltage and frequency are fixed at DDR4-2666. Systems without forced airflow over the DIMM slots may see higher temperatures.

288-pin 4Rx4 registered build

The 288-pin RDIMM uses a 4Rx4 organisation built from major OEM DRAM chips and fits only DDR4 RDIMM slots that support registered ECC. No heat spreader means a low profile that clears most CPU coolers, but the module must be seated in a compatible Synology SA6400 memory slot. Builders who need unbuffered UDIMMs or a different rank configuration cannot use this memory.