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Two green DDR4 ECC UDIMM sticks, 288-pin, no heat spreader

OWC

OWC 32GB (2x16GB) DDR4 2666 ECC UDIMM for Synology RS4017xs+ RS4021xs+

SKU CH-NQCG-K52HM

32 GB kit of two 16 GB DDR4 2666 ECC UDIMMs validated for Synology RS4017xs+ and RS4021xs+ rackstations

  • Capacity32GB (2 x 16GB)
  • Type288-Pin DDR4 ECC UDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 32GB (2 x 16GB)

  • 32 GB total capacity from two 16 GB modules
  • DDR4 2666 speed rated at PC4-21300 with CL19 latency
  • ECC unbuffered design protects data integrity in NAS workloads
  • Validated for Synology RackStation RS4017xs+ and RS4021xs+
  • Low 1.2 V operation reduces power draw and heat

Synology RackStation Memory Upgrade

This 32 GB kit contains two 16 GB DDR4 2666 ECC UDIMM modules validated for the Synology RS4017xs+ and RS4021xs+. It targets administrators who need to expand the installed memory of those specific rack-mount NAS units.

288-Pin ECC Unbuffered DIMM Fit

The modules use the standard 288-pin DDR4 form factor and run at 1.2 V with CL19 latency. They slot directly into the compatible RackStation DIMM sockets without requiring registered or load-reduced memory, freeing the existing slots for this matched pair.

JEDEC-Standard Compliance and Lifetime Support

Each module meets JEDEC and RoHS specifications, ensuring a warranty-safe upgrade path. The kit is backed by OWC's limited lifetime warranty and advanced replacement programme, providing technical support if a module ever needs service.

Highlights

  • 32 GB total capacity from two 16 GB modules
  • DDR4 2666 speed rated at PC4-21300 with CL19 latency
  • ECC unbuffered design protects data integrity in NAS workloads
  • Validated for Synology RackStation RS4017xs+ and RS4021xs+
  • Low 1.2 V operation reduces power draw and heat

Specifications

BrandOWC
Part Number2E6D42R8032P
Capacity32GB (2 x 16GB)
Type288-Pin DDR4 ECC UDIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredUnbuffered
Rank2Rx8
Heat SpreaderNo
Compatible SystemSynology RackstationRS4017xs+
Synology RackstationRS4021xs+

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Questions about this item

Will the CL19 latency and 2666 MHz speed limit throughput under sustained NAS workloads?

The kit runs at DDR4 2666 with CL19 timing; sustained throughput is determined by the Synology RS4017xs+ or RS4021xs+ memory controller and workload mix, not by the modules alone.

Does the lack of a heat spreader cause higher temperatures or fan noise during all-day operation?

These 1.2 V unbuffered ECC UDIMMs have no heat spreader; the Synology chassis airflow manages thermals, and typical NAS fan profiles remain unchanged under continuous load.

Which Synology models must I already own for this 32 GB kit to be compatible?

The 2x16 GB DDR4 2666 ECC UDIMM kit is validated for Synology RackStation RS4017xs+ and RS4021xs+ systems.

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