OWC 64GB (2x32GB) DDR4 2666 CL19 ECC SODIMM 2Rx8 1.2V memory upgrade

64GB DDR4 ECC SODIMM kit for Synology NAS

This kit provides 64GB of DDR4 2666 ECC memory in two 32GB modules. It targets owners of the Synology DiskStation DS1621+ or DS1621xs+ who need additional capacity for virtual machines or large file caches. The unbuffered 2Rx8 design matches the platforms' supported architecture.

Fits 260-pin slots and frees CPU overhead

Each module uses the 260-pin SO-DIMM form factor required by the compatible DiskStation models. ECC circuitry corrects single-bit errors without involving the processor, freeing CPU cycles for storage services. The 1.2V operating voltage matches the platform's standard memory power rail.

Sustained operation at JEDEC 2666 speeds

Rated at PC4-21300 with CL19 latency, the modules maintain spec-compliant throughput during extended backup or indexing jobs. Backward compatibility with 2400MHz and 2133MHz buses allows the kit to clock down automatically if the system firmware requires a lower frequency.