NEMIX RAM 32GB (2x16GB) DDR4 2666 ECC UDIMM Synology RS4021xs+

Synology RS4021xs+ memory kit

This 32 GB kit uses two 16 GB DDR4 2666 modules built for the Synology RackStation RS4021xs+. ECC unbuffered UDIMM design adds error correction without requiring registered memory support. The kit targets NAS owners who need to expand system memory for heavier workloads or virtualisation tasks.

Two-module 288-pin DDR4 configuration

Each stick runs at 1.20 V with CL19 latency and a 2Rx8 organisation, matching the platform's native memory controller. No heat spreaders are fitted, so the modules fit tight drive-bay layouts without clearance issues. The kit plugs directly into the NAS memory slots and requires no additional cabling or firmware steps beyond the standard installation guide.

Low-voltage DDR4 ECC operation

At 1.20 V the modules draw minimal power and generate little heat inside a passively cooled chassis. ECC circuitry detects and corrects single-bit errors during continuous operation, protecting data integrity under sustained load. The unbuffered design keeps latency low while the absence of spreaders allows airflow to reach the DRAM directly.