NEMIX RAM 64GB (4x16GB) DDR4 2666 ECC UDIMM CL19 1.2V 288-Pin Synology RS3621RPxs

Synology RS3621RPxs 64GB DDR4 ECC kit

This 64GB kit contains four 16GB DDR4 2666 UDIMMs validated for the Synology RS3621RPxs RackStation. Each module runs at 1.20V with CL19 latency and includes on-die ECC for data integrity in NAS workloads. The 288-pin unbuffered design fits the system’s native memory slots without registration overhead. IT teams can install the kit in minutes to reach the platform’s supported capacity ceiling.

Capacity and headroom for multi-user NAS

Four 16GB 2Rx8 modules populate every available slot, delivering the full 64GB the RS3621RPxs can address. This headroom handles concurrent file shares, virtual-machine storage and Docker containers without paging to disk. Workloads that exceed 64GB will require a higher-capacity platform, as the memory controller does not support larger UDIMMs or additional channels. The kit therefore matches the system’s hard limit rather than leaving empty slots for future growth.

Thermals noise and power draw in normal use

Modules operate at the standard 1.20V DDR4 voltage and have no heat spreaders, relying on the chassis airflow directed across the DIMM banks. Under typical NAS loads the sticks stay within JEDEC thermal limits without adding audible fan noise. Power draw scales linearly with active rank count, so the 2Rx8 organisation keeps per-module consumption predictable during sustained read-write cycles. No extra cooling or voltage tuning is required for continuous operation.