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Four green DDR4 RDIMM modules with gold contacts and black chips

OWC

OWC 32GB (4x8GB) DDR4 2666 ECC Registered RDIMM server RAM for Synology RackStation RS18017xs+

SKU CH-XM1F-D2SM2

A 32GB kit of four 8GB DDR4 2666 ECC registered RDIMMs for Synology RackStation RS18017xs+ servers

  • Capacity32GB (4 x 8GB)
  • Type288-Pin DDR4 SDRAM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 32GB (4 x 8GB)

Rank 1Rx4

  • 32 GB ECC registered kit protects data integrity in Synology RS18017xs+
  • Four 8 GB modules run at DDR4 2666 CL19 for responsive multitasking
  • 2 V low-voltage operation reduces power draw and heat
  • JEDEC and RoHS compliant for warranty-safe server upgrades
  • Backward compatible with 2133 MHz and 2400 MHz systems

Server memory upgrade kit

This OWC kit provides 32GB of DDR4 ECC registered memory in a 4x8GB configuration. It is built for the Synology RackStation RS18017xs+ and matches the OEM D4RD-2666-8G and D4ER01-8G part numbers. The modules run at 2666MHz with CL19 latency at 1.2V. They are designed for servers, workstations and NAS systems that require registered ECC DIMMs.

Replaces slower DDR4 modules

The kit upgrades systems currently running 2133MHz or 2400MHz DDR4 ECC registered memory. The jump is worth it when the platform supports 2666MHz operation and the workload benefits from the higher data rate. It will not work in standard desktop computers or alongside unbuffered or load-reduced ECC modules. Buyers who need a different capacity or a non-registered format should look elsewhere.

Sustained load behaviour

Each module uses a 1Rx4 organisation and operates within JEDEC standard voltage. The registered buffer reduces electrical load on the memory controller during continuous operation. ECC corrects single-bit errors in real time, helping maintain data integrity under heavy, prolonged workloads. The absence of heat spreaders means airflow across the DIMMs is the primary cooling method.

Highlights

  • 32 GB ECC registered kit protects data integrity in Synology RS18017xs+
  • Four 8 GB modules run at DDR4 2666 CL19 for responsive multitasking
  • 2 V low-voltage operation reduces power draw and heat
  • JEDEC and RoHS compliant for warranty-safe server upgrades
  • Backward compatible with 2133 MHz and 2400 MHz systems

Specifications

BrandOWC
Part Number2R6D41R4032S
Capacity32GB (4 x 8GB)
Type288-Pin DDR4 SDRAM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank1Rx4
Multi-channel KitDual Channel Kit
Heat SpreaderNo

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Questions about this item

Will the 288-pin DDR4 RDIMMs fit the four memory slots in the Synology RS18017xs+?

Yes, the kit provides four 8 GB modules that match the 288-pin DDR4 RDIMM form factor used by the RS18017xs+ memory slots.

What is the correct installation sequence for the four modules to enable dual-channel operation?

Populate the four slots in the order shown in the RS18017xs+ service guide — typically slot 1, slot 2, slot 3, slot 4 — so the two channels are balanced.

When should the memory be replaced if ECC starts logging correctable errors?

Replace the kit when the system logs show a rising count of correctable ECC errors, indicating the modules are nearing end of life.

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