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Two green DDR4 RDIMM sticks with gold contacts and black chips

OWC

OWC 128GB (2x64GB) DDR4 2933MHz CL21 ECC Registered RDIMM 1.2V 288-pin Server RAM

SKU CH-0DDJ-GTY0H

Dual-channel 128GB DDR4 2933MHz ECC registered RDIMM kit for servers and workstations

  • Capacity128GB (2 x 64GB)
  • Type288-Pin DDR4 ECC RDIMM
  • SpeedDDR4 2933 (PC4 23400)
  • CAS LatencyCL21
  • Voltage1.2V
  • ECCYes

Capacity 128GB (2 x 64GB)

Show 4 more configurations

Rank 2Rx4

  • 128 GB total capacity from two 64 GB modules
  • ECC registered design detects and corrects single-bit errors
  • DDR4 2933 MHz speed with CL21 latency
  • 2 V operation reduces server power draw
  • Backward compatible with 2133, 2400 and 2666 MHz systems

Server ECC Registered Memory

This 128GB kit contains two 64GB DDR4 2933MHz CL21 registered DIMMs built for servers, workstations and compatible NAS systems. It is designed for environments that require error-correcting code and registered signalling. Standard desktop computers cannot use these modules.

JEDEC Compliant Dual-Channel Kit

The modules operate at 1.2V and meet JEDEC PC4-23400 specifications for a warranty-safe upgrade. A dual-channel configuration is provided from the matched pair. No heat spreaders are included on the 288-pin RDIMMs.

128GB Capacity With Speed Headroom

The kit delivers 128GB total capacity and runs at 2933MHz with CL21 latency. Backward compatibility allows operation at 2133MHz, 2400MHz and 2666MHz when the platform requires lower speeds. It cannot be mixed with unbuffered memory.

Highlights

  • 128 GB total capacity from two 64 GB modules
  • ECC registered design detects and corrects single-bit errors
  • DDR4 2933 MHz speed with CL21 latency
  • 2 V operation reduces server power draw
  • Backward compatible with 2133, 2400 and 2666 MHz systems

Specifications

BrandOWC
Part Number2R9D42R4128P
Capacity128GB (2 x 64GB)
Type288-Pin DDR4 ECC RDIMM
SpeedDDR4 2933 (PC4 23400)
CAS LatencyCL21
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

Will the 2Rx4 64 GB modules need any firmware or thermal-pad replacement during their service life?

No firmware updates or thermal pads are required; the modules have no heat spreader and run at standard 1.2 V JEDEC voltage.

What is the first limit reached when the kit runs continuously at 2933 MHz CL21?

The CAS latency of CL21 at 2933 MHz is the primary timing constraint under sustained load.

How much power and heat does the 128 GB kit produce when the server runs all day?

At 1.2 V the two 64 GB RDIMMs draw minimal power and generate low heat with no spreader needed.

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