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Four green 288-pin DDR4 RDIMM modules with black chips and gold contacts

OWC

OWC 128GB (4x32GB) DDR4 2666 ECC Registered RDIMM server RAM

SKU CH-9EA9-ZERZE

128GB kit of four 32GB DDR4-2666 ECC registered RDIMMs for compatible Synology NAS and 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

  • ECC registered design prevents data corruption in critical workloads
  • 128GB quad-channel kit expands memory capacity for virtualization
  • DDR4 2666 CL19 timing matches Synology NAS specifications
  • 2V operation reduces power draw in dense server racks
  • JEDEC compliant modules ensure warranty-safe upgrades for SA3400 and SA3610

Server ECC Registered DDR4 Kit

This 128GB kit contains four 32GB DDR4 2666 ECC Registered RDIMM modules built for Synology NAS models such as the SA3400, SA410, SA3600 and SA3610. It is designed for workstations and servers that require registered memory with error correction. Standard desktop computers cannot use this memory. Mixing it with unbuffered or load-reduced ECC modules is not supported.

DDR4 2666 Registered Interface Limits

The modules run at DDR4 2666 (PC4-21300) with CL19 latency at 1.2V and are backward compatible with 2133MHz and 2400MHz systems. Registered buffering adds a clock cycle, so the memory controller must support registered DIMMs. Only platforms that accept 288-pin ECC Registered DDR4 can use this kit; consumer desktop chipsets will not recognise it.

Build Quality and Daily Implications

Each module follows JEDEC and RoHS standards without a heat spreader, relying on server chassis airflow for cooling. The 2Rx4 rank organisation fits dense memory configurations in compatible Synology NAS units. Installation is a straightforward DIMM swap, but the registered design means the system must explicitly support registered memory for the kit to function.

Highlights

  • ECC registered design prevents data corruption in critical workloads
  • 128GB quad-channel kit expands memory capacity for virtualization
  • DDR4 2666 CL19 timing matches Synology NAS specifications
  • 2V operation reduces power draw in dense server racks
  • JEDEC compliant modules ensure warranty-safe upgrades for SA3400 and SA3610

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

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Questions about this item

Should I buy the 128GB kit as four 32GB modules or look for a different capacity?

The kit contains four 32GB modules for a total of 128GB. Each module is a 288-pin DDR4 ECC Registered DIMM rated at 2666MHz CL19 1.2V 2Rx4.

What does the 2666MHz rating mean once the memory is installed in my server?

The modules run at DDR4 2666 (PC4-21300) with CL19 latency at 1.2V. They are backward compatible with 2133MHz and 2400MHz systems, so the actual speed will match the highest speed your platform supports.

Is this DDR4 ECC Registered RDIMM compatible with standard desktop motherboards?

No. This is ECC Registered DDR4 memory designed for servers, workstations and compatible NAS systems such as Synology SA3400, SA410, SA3600 and SA3610. It will not work in standard desktop computers and cannot be mixed with unbuffered or load-reduced memory.

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