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Four green DDR4 RDIMM modules with gold contacts, no heat spreaders

OWC

OWC 128GB (4x32GB) DDR4 2666 ECC Registered RDIMM for Synology RACKSTATION RS18017xs+ server RAM

SKU CH-7Y9W-MNVCX

ECC registered DDR4 kit adds 128 GB across four 32 GB modules at 2666 MHz CL19 for Synology RackStation RS18017xs+ servers

  • Capacity128GB (4 x 32GB)
  • Type288-Pin DDR4 SDRAM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 128GB (4 x 32GB)

Rank 2Rx4

  • 128 GB total capacity from four 32 GB modules
  • ECC registered design protects data integrity in server workloads
  • DDR4 2666 MHz CL19 timing matches Synology RS18017xs+ specifications
  • 2 V operation reduces power draw and heat output
  • JEDEC and RoHS compliant for warranty-safe upgrades

128GB DDR4 ECC Registered Kit

This OWC kit provides 128GB of DDR4 2666 ECC registered memory across four 32GB modules. It is built for the Synology RACKSTATION RS18017xs+ and compatible workstations or NAS systems. The modules run at 1.2V with CL19 latency and conform to JEDEC PC4-21300 specifications.

For servers needing registered ECC; not for desktops

This memory suits administrators upgrading a Synology RS18017xs+ or similar registered-ECC platform. It will not work in standard desktop computers that require unbuffered non-ECC modules. Buyers who need load-reduced ECC or consumer SO-DIMM memory should look elsewhere.

Four matched modules enable dual-channel population

The kit contains four identical 32GB RDIMMs tested together for dual-channel operation. No heat spreaders are included, relying on server chassis airflow. Backward compatibility with 2133MHz and 2400MHz systems allows deployment in older slots without configuration changes.

Highlights

  • 128 GB total capacity from four 32 GB modules
  • ECC registered design protects data integrity in server workloads
  • DDR4 2666 MHz CL19 timing matches Synology RS18017xs+ specifications
  • 2 V operation reduces power draw and heat output
  • JEDEC and RoHS compliant for warranty-safe upgrades

Specifications

BrandOWC
Part Number2R6D42R4128S
Capacity128GB (4 x 32GB)
Type288-Pin DDR4 SDRAM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Multi-channel KitDual Channel Kit
Heat SpreaderNo

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

Does the Synology RACKSTATION RS18017xs+ need all four 32 GB modules populated to run this 128 GB kit?

The kit contains four 32 GB RDIMMs for a total of 128 GB; the RS18017xs+ has four DIMM slots, so all slots must be filled to reach the full capacity.

Can I keep my existing 2133 MHz or 2400 MHz DDR4 ECC Registered RDIMMs and add this 2666 MHz kit?

The modules are backward compatible with 2133 MHz and 2400 MHz speeds, but registered ECC memory cannot be mixed with unbuffered or load-reduced DIMMs.

How can I verify the 2666 MHz CL19 1.2 V registered ECC modules are running correctly after installation?

Check the system BIOS or Synology DSM memory information for 2666 MHz speed, CL19 timings, 1.2 V voltage and registered ECC status on all four DIMMs.

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