NEMIX RAM 256GB (8x32GB) DDR4 2666 PC4-21300 ECC RDIMM memory upgrade for Synology SA6400

Synology SA6400 256GB DDR4 kit

This 256GB kit contains eight 32GB DDR4 2666 registered ECC RDIMMs built for the Synology SA6400 NAS. It targets administrators who need maximum supported memory capacity for virtualization, large file caches or heavy multi-user workloads on that specific platform.

Registered ECC RDIMM build

Each module is a 288-pin DDR4 RDIMM with 2Rx4 organisation, CL19 latency and 1.20V operation. Registered buffering and on-die ECC protect data integrity under sustained load, while the standard DDR4 voltage keeps power draw predictable in a densely populated chassis. No heat spreaders are fitted, so airflow across the DIMM slots remains unimpeded.

Upgrading from smaller kits

The kit replaces lower-capacity DDR4 2666 RDIMM sets when the SA6400 workload outgrows the installed memory. The jump is worth it when applications hit the current limit and the system can address the full 256GB across all eight slots. Buyers needing non-ECC memory or faster speeds should look elsewhere.