OWC 16GB (2x8GB) DDR3 1600 CL11 ECC UDIMM 1.5V Synology memory upgrade

Synology NAS ECC UDIMM kit

This OWC kit provides 16 GB of DDR3 1600 ECC unbuffered memory in two 8 GB modules. It targets owners of Synology RC18015xs+, RS10613xs+, RS18016xs+, RS3413xs+ and RS3614xs+ units who need to expand system memory for heavier workloads. The modules run at CL11 latency and 1.5 V, matching the JEDEC PC3-12800 standard for these platforms.

240-pin DDR3 form factor

Each stick uses the standard 240-pin UDIMM layout with 2Rx8 organisation and no heat spreader, so it fits the factory DIMM slots without clearance issues. ECC support adds single-bit error correction for data integrity in always-on NAS environments. Unbuffered design keeps latency low for the memory controllers used in the listed Synology models.

Replaces Synology RAMEC1600DDR3-8GBX2

The kit serves as a direct replacement for the OEM part number, doubling the factory 8 GB per slot configuration. The upgrade is worthwhile when virtual machines, Docker containers or large file caches push the original memory limit. It is not suited for systems that require registered DIMMs, higher speeds than DDR3 1600 or voltages other than 1.5 V.