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Two green SODIMM modules with gold edge connectors and black memory chips

OWC

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

SKU CH-5JQ1-8C4DS

Dual 32 GB DDR4 2666 ECC SODIMM kit adds 64 GB to compatible Synology DiskStation NAS units

  • Capacity64GB (2 x 32GB)
  • Type260-Pin DDR4 ECC SODIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes
  • 64 GB kit expands NAS capacity for heavier workloads
  • Dual 32 GB modules enable dual-channel throughput at 2666 MT/s
  • ECC protection corrects single-bit errors to safeguard data integrity
  • Low 1.2 V operation reduces heat and power draw
  • JEDEC-standard 260-pin SODIMM fits Synology DS1621+ and DS1621xs+

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.

Highlights

  • 64 GB kit expands NAS capacity for heavier workloads
  • Dual 32 GB modules enable dual-channel throughput at 2666 MT/s
  • ECC protection corrects single-bit errors to safeguard data integrity
  • Low 1.2 V operation reduces heat and power draw
  • JEDEC-standard 260-pin SODIMM fits Synology DS1621+ and DS1621xs+

Specifications

BrandOWC
Part Number2C6D42R8064P
Capacity64GB (2 x 32GB)
Type260-Pin DDR4 ECC SODIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredUnbuffered
Rank2Rx8
Heat SpreaderNo
Compatible SystemSynology DiskStation DS1621+
Synology DiskStation DS1621xs+

Questions about this item

Will the CL19 latency become the bottleneck when the DS1621+ runs 24/7 workloads?

The modules run at DDR4 2666 with CL19 timing; the NAS memory controller sets the operating speed, so latency stays at the rated value during sustained use.

How much heat do two 32 GB sticks add to a DS1621xs+ running all day?

These SODIMMs have no heat spreader and operate at 1.2 V, so thermal contribution inside the chassis is minimal under continuous load.

Which Synology models are confirmed to accept this 2Rx8 ECC kit?

The kit is validated for DiskStation DS1621+ and DS1621xs+ systems that support 260-pin DDR4 ECC SODIMMs.

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