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Two green DDR4 LRDIMM modules with gold contacts and black chips

OWC

OWC 256GB (2×128GB) DDR4 2933 PC4-23400 CL21 4Rx4 288-pin 1.2V ECC LRDIMM kit for PowerEdge R840 R940xa

SKU CH-XEZY-HCFCN

Two 128 GB DDR4 2933 ECC load-reduced DIMMs add 256 GB to Dell PowerEdge R840 and R940xa servers

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank4Rx4

Capacity 256GB (2 x 128GB)

  • 256 GB capacity with two 128 GB modules
  • DDR4 2933 speed rated PC4-23400 CL21
  • ECC load-reduced design for server reliability
  • 2 V operation matches JEDEC standard
  • Compatible with PowerEdge R840 and R940xa

Server ECC LRDIMM kit

This 256GB kit contains two 128GB DDR4 2933 PC4-23400 CL21 4Rx4 288-pin 1.2V ECC Load Reduced DIMMs. It is built for Dell PowerEdge R840 and R940xa servers that require registered ECC memory with load-reduced buffering. Standard desktop or workstation boards cannot use these modules.

Load-reduced buffering benefit

Load-reduced DIMMs reduce electrical load on the server memory bus, allowing the higher 4Rx4 density to run at 2933MHz without signal degradation. The kit is backward compatible with 2133MHz, 2400MHz and 2666MHz bus speeds, so it will operate at the highest speed the platform supports. JEDEC and RoHS compliance ensures a warranty-safe upgrade.

Compatibility checks required

Verify that your R840 or R940xa BIOS revision supports 128GB LRDIMM capacity per slot and 4Rx4 organisation. Confirm the memory population rules for your CPU configuration, as some layouts restrict LRDIMM mixing with standard RDIMM or UDIMM modules. This kit will not work in systems that only accept unbuffered or registered ECC memory.

How it compares

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

Price $1,435.99
Pricier than about 64% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $5.61 per GB
Cheaper than about 69% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2L9D44R4256P
Total capacity256 GB (2 × 128 GB)
Product type288-Pin DDR4 ECC LRDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeLoad Reduced
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsDell PowerEdge R840
Dell PowerEdge R940xa

Other versions of this model

5 more in the same range

Questions about this item

Will the 4Rx4 LRDIMM modules need to be replaced as a matched 256 GB kit if one fails?

Yes, the 2 x 128 GB kit is validated as a matched pair; replacing a single module with a different rank or vendor can break ECC load-reduced operation on the PowerEdge R840 or R940xa.

What speed ceiling appears first when the 2933 MHz CL21 LRDIMMs run sustained workloads on the R840?

The platform memory controller caps the 4Rx4 LRDIMMs at 2933 MHz; sustained loads will not exceed this JEDEC-rated frequency.

How much heat and power do the 1.2 V 288-pin LRDIMMs generate during all-day server operation?

Each 128 GB module runs at 1.2 V without a heat spreader; total kit power stays within standard DDR4 LRDIMM limits for the R840 and R940xa cooling design.

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