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Green rectangular DDR4 memory module with gold edge connector and black chips no heat spreader

OWC

OWC 128GB DDR4 2933 ECC Registered RDIMM 8Rx4 288-pin 1.2V CL21 memory upgrade

SKU CH-VCRD-ETNPY

A 128 GB DDR4 2933 ECC registered RDIMM with CL21 timing and 1.2 V operation for compatible ASRock barebone servers

  • Total capacity128 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latency21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4
  • 128 GB capacity expands server memory headroom
  • DDR4 2933 MHz CL21 delivers high-throughput data rates
  • ECC registered design protects data integrity in critical workloads
  • 2 V operation reduces power draw per module
  • Compatible with ASRock RM23724, RM23712, RM138, MEC2U and 4U36L2S barebones

Server-grade ECC RDIMM

This single 128GB DDR4 2933 module uses a registered ECC design built for ASRock bare-bone servers such as the RM23724-C622LM/22E. It targets administrators who need maximum capacity per slot in workstation or NAS platforms that require registered memory.

288-pin registered layout

The 8Rx4 organisation and 1.2V operation follow JEDEC and RoHS standards without a heat spreader, so the module fits dense 4U or 2U chassis where airflow is managed by the system. Registered signalling adds one clock cycle of latency but allows the memory controller to drive many ranks reliably.

DDR4 2933 ceiling

Speed steps down automatically to 2666, 2400 or 2133 MHz when the platform demands it, but cannot exceed the rated 2933 MT/s. Mixing with unbuffered or load-reduced DIMMs is not supported, so every slot must use the same registered ECC type.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $701.99
Pricier than about 56% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB
Higher than about 70% of the 20,941 comparable items (median 32 GB).
CAS latency 21
Lower than about 63% of the 483 comparable items (median 22).
Price per GB $5.48 per GB
Cheaper than about 70% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R9D48R4128G
Total capacity128 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latency21
ECC supportYes
Buffer typeRegistered
Memory rank8Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsASRock Barebone Server RM23724-C622LM/22E
ASRock Barebone Server 4U36L2S-C621
ASRock Barebone Server MEC2U-EP2C621D16/4LP
ASRock Barebone Server RM138-C622LM/4L
ASRock Barebone Server RM23712-C622LM/22E

Questions about this item

What DDR4 speed and CAS latency does this 128GB ECC RDIMM run at?

It operates at DDR4 2933 (PC4-23400) with a CAS latency of 21.

Does this 288-pin module need a heat spreader or special clearance to fit in an ASRock RM23724-C622LM/22E?

No heat spreader is present; the standard 288-pin RDIMM height fits the server's DIMM slots without extra clearance.

How do I install this registered ECC module and what common step should I avoid?

Power down, open the chassis, align the notch on the 288-pin edge connector with the slot key, press firmly until both latches click. Do not mix with unbuffered or load-reduced DIMMs.

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