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Green circuit board with gold contacts and black memory chips

OWC

OWC 128GB DDR4 2933MHz CL21 1.2V 288pin ECC Registered RDIMM 4Rx4 memory upgrade

SKU CH-VWPS-0J3D7

128 GB DDR4-2933 ECC registered RDIMM for Supermicro X11 server boards, CL21 at 1.2 V

  • Total capacity128 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank4Rx4

Capacity 128GB

  • 128GB capacity supports large server workloads
  • DDR4 2933MHz CL21 delivers high-speed data throughput
  • ECC Registered design protects data integrity
  • 2V operation reduces power consumption
  • Validated for Supermicro X11 series motherboards

System-specific ECC RDIMM

This OWC 128GB DDR4 2933MHz CL21 1.2V 288pin ECC Registered RDIMM is built for Supermicro motherboards X11DGQ, X11DPD-L, X11DPD-M25, X11DPFF-SN and X11DPFF-SNR. It targets server, workstation and NAS operators who need registered error-correcting memory.

Registered ECC changes compatibility

The 4Rx4 registered design with on-die ECC prevents use in standard desktop platforms and cannot be mixed with unbuffered modules. Backward compatibility with 2133MHz, 2400MHz and 2666MHz buses lets the same DIMM slot into older Supermicro generations without configuration changes.

Verify motherboard model and memory population rules

Confirm your board is one of the five listed X11 models and check the vendor manual for maximum supported capacity per slot and per channel. Registered ECC DIMMs require a platform that explicitly supports registered memory; consumer chipsets will not post with this module installed.

How it compares

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

Price $735.99
Pricier than about 57% 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).
Price per GB $5.75 per GB
Cheaper than about 68% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R9D44R4128G
Total capacity128 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSupermicro Motherboard X11DGQ
Supermicro Motherboard X11DPD-L
Supermicro Motherboard X11DPD-M25
Supermicro Motherboard X11DPFF-SN
Supermicro Motherboard X11DPFF-SNR

Other versions of this model

5 more in the same range

Questions about this item

Will the 4Rx4 ECC registered DIMM need any firmware updates or component swaps during its service life?

No firmware updates or component swaps are required for the 4Rx4 ECC registered DIMM; it is a solid-state module with no moving parts or field-replaceable components.

What limit appears first when the 128GB DDR4 2933MHz CL21 module runs at full load continuously?

The memory controller's maximum supported bandwidth and rank population rules for the Supermicro X11 motherboards will be reached before the module's own 2933MHz CL21 rating becomes a bottleneck.

How much heat and power does the 1.2V 288-pin RDIMM produce when operating all day in a server chassis?

The module runs at the standard DDR4 1.2V without a heat spreader, so its thermal output stays within JEDEC limits for registered DIMMs and relies on normal chassis airflow for cooling.

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