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Two green DDR4 RDIMM modules with gold contacts and black chips, no heat spreader

OWC

OWC 128GB (2x64GB) DDR4 2666 ECC Registered RDIMM server RAM

SKU CH-GH32-BHHXB

Two 64 GB DDR4 2666 CL19 ECC registered RDIMMs totalling 128 GB at 1.2 V for Synology SA6400 NAS, servers and workstations

  • Capacity128GB (2 x 64GB)
  • Type288-Pin DDR4 SDRAM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 128GB (2 x 64GB)

  • ECC registered design protects data integrity in servers
  • 128GB dual-channel kit expands NAS memory capacity
  • DDR4 2666 CL19 speed matches system requirements
  • 2V operation reduces power draw under load
  • JEDEC compliant modules ensure warranty-safe upgrades

Server ECC Registered Memory Kit

This OWC kit provides 128GB of DDR4 2666 ECC Registered memory in a dual-channel configuration of two 64GB modules. It is built for servers, workstations and compatible NAS systems that require registered DIMMs with error correction. The modules operate at 1.2V with CL19 latency and use a 2Rx4 rank organisation. Buyers needing standard unbuffered desktop memory should look elsewhere.

Verify Platform Compatibility First

Confirm that your system accepts 288-pin DDR4 ECC Registered RDIMMs and does not require unbuffered or load-reduced modules. The memory runs at 2666MHz and is backward compatible with 2133MHz and 2400MHz bus speeds, but the motherboard or NAS must explicitly support registered ECC DIMMs. Mixing this kit with unbuffered or LRDIMM memory is not supported and will prevent boot.

Dual-Channel Kit Simplifies Installation

The matched pair of 64GB modules enables dual-channel operation without the need to source individual sticks separately. Each module conforms to JEDEC PC4-21300 standards and is ROHS compliant, ensuring a warranty-safe upgrade for qualified OEM platforms. No heat spreaders are included, so airflow in the chassis should be adequate for dense memory configurations.

Highlights

  • ECC registered design protects data integrity in servers
  • 128GB dual-channel kit expands NAS memory capacity
  • DDR4 2666 CL19 speed matches system requirements
  • 2V operation reduces power draw under load
  • JEDEC compliant modules ensure warranty-safe upgrades

Specifications

BrandOWC
Part Number2R6D42R4128P
Capacity128GB (2 x 64GB)
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

Does the 128GB kit include both 64GB modules or must they be bought separately?

The kit contains two 64GB DDR4 2666 ECC registered RDIMMs for a total of 128GB; no additional modules are required.

Should I choose the dual-channel 2x64GB kit or a single 128GB module for my Synology SA6400?

The dual-channel 2x64GB kit matches the SA6400's memory architecture and provides the rated 2666MHz CL19 performance.

Will the 2666MHz CL19 rating run at that speed in a system that only supports 2133MHz or 2400MHz?

The modules are backward compatible and will operate at 2133MHz or 2400MHz when the platform requires it.

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