OWC 16GB (2x8GB) DDR4 2666 ECC UDIMM for Synology RS4017xs+ RS4021xs+ memory upgrade

OWC 16GB DDR4 2666 ECC kit for Synology RS4017xs+

This kit adds 16GB of DDR4 2666 ECC UDIMM memory across two 8GB modules. It is built for Synology RackStation RS4017xs+ and RS4021xs+ systems that require JEDEC-standard unbuffered ECC memory. The CL19 timing and 1.2V operation match the platform specifications. Buyers needing registered DIMMs or non-ECC memory should choose a different product.

JEDEC-standard DDR4 2666 at 1.2V

Each module runs at the rated 2666MHz speed with CL19 latency while drawing only 1.2V. ECC circuitry detects and corrects single-bit errors to protect data integrity in NAS workloads. The unbuffered design keeps the signal path short for broad compatibility with the listed RackStation models. Backward compatibility allows use in slots rated for 2133MHz or 2400MHz DDR4.

Two matched 8GB modules tested for warranty-safe

The paired modules are validated together to ensure stable dual-channel operation in the target Synology systems. OWC tests every module in-house and backs the kit with a limited lifetime warranty and free technical support. No heat spreaders are included, keeping the low-profile form factor compatible with dense server chassis. The kit contains only the two memory modules; no tools or software are bundled.