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Green rectangular DDR4 288-pin RDIMM module with black memory chips and gold contacts, no heat spreader

OWC

OWC 128GB DDR4 2933MHz ECC Registered RDIMM 4Rx4 server RAM

SKU CH-9W8H-KNEKS

128 GB DDR4 ECC registered RDIMM running at 2933 MHz with CL21 latency and 1.2 V operation for servers and workstations

  • Total capacity128 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank4Rx4
  • 128 GB capacity lets servers handle larger workloads
  • DDR4 2933 MHz CL21 speed matches OEM timing specs
  • ECC registered design protects data integrity in critical systems
  • 2 V operation reduces power draw per module
  • Backward compatible with 2133, 2400 and 2666 MHz platforms

Targeted Server Upgrade

This 128GB DDR4 ECC Registered RDIMM is built for servers, workstations and NAS systems that require registered memory. It will not work in standard desktop computers and cannot be mixed with unbuffered modules. The module replaces Supermicro part numbers MEM-DR412L-SL01-ER29 and MEM-DR412MH-ER29. Buyers who need desktop-compatible RAM should look elsewhere.

Build Integration

The 288-pin DIMM operates at 1.2V and runs at 2933MHz with CL21 latency. It is backward compatible with 2133MHz, 2400MHz and 2666MHz bus speeds, allowing it to slot into existing DDR4 server platforms without configuration changes. The 4Rx4 organisation and registered buffer reduce electrical load on the memory controller. Systems that only accept unbuffered DIMMs cannot use this module.

Compliance And Support

The module meets JEDEC standard specifications and is RoHS compliant, providing a warranty-safe upgrade path. OWC supplies an advanced replacement programme and limited lifetime warranty that includes free technical support. No heat spreader is included, so airflow in the chassis must be sufficient for bare modules. Users who require bundled cooling accessories will not find them here.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $701.99
Pricier than about 75% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $5.48 per GB
Cheaper than about 69% of the 6,064 comparable items (median $7.25 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

Questions about this item

How much capacity does a single 4Rx4 module provide?

One module delivers 128GB of DDR4 memory in a 288-pin registered form factor.

What voltage and heat-spreader design apply during continuous operation?

The module runs at 1.2V and has no heat spreader, relying on server chassis airflow for cooling.

Which memory type and slot must the host system already have?

The system must support DDR4 ECC registered RDIMM in a 288-pin slot; it will not work with unbuffered desktop memory.

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