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Two green 288-pin DDR4 ECC LRDIMM modules with black chips, no heat spreader

OWC

OWC 256GB (2x128GB) DDR4 2933 CL21 ECC LRDIMM memory upgrade

SKU CH-5MEP-N2ZD4

A 256 GB DDR4 ECC LRDIMM kit (2 × 128 GB) at 2933 MHz CL21 for Dell PowerEdge R740, R740XD, R940 and T640 servers

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank8Rx4

Capacity 256GB (2 x 128GB)

  • ECC load-reduced design protects data integrity in Dell PowerEdge servers
  • 256 GB kit (2 × 128 GB modules) expands memory capacity for virtualisation workloads
  • 2933 MHz DDR4 speed with CL21 latency delivers responsive server performance
  • 2 V operation reduces power draw while maintaining stability
  • Backward compatible with 2133, 2400 and 2666 MHz systems for flexible deployment

Server-grade ECC LRDIMM kit

This OWC kit supplies 256 GB of DDR4 memory in two 128 GB load-reduced DIMMs. Each module runs at 2933 MT/s with CL21 latency at 1.2 V and carries ECC protection. The 288-pin form factor and 8Rx4 organisation are built for registered server platforms only.

Suits Dell PowerEdge R740, R740XD, R940 and T640

These modules are validated for the listed Dell PowerEdge servers and will not work in standard desktop boards. They cannot be mixed with unbuffered or registered ECC DIMMs, so builders upgrading other platforms or mixing memory types should look elsewhere.

Fills two DIMM slots in compatible Dell servers

The kit plugs directly into 288-pin DDR4 slots on the supported PowerEdge models. Backward compatibility with 2133, 2400 and 2666 MT/s speeds lets the memory clock down if the system requires it. No heat spreader is fitted, leaving clearance for dense slot populations.

How it compares

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

Price $1,351.99
Pricier than about 63% 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 $5.28 per GB
Cheaper than about 73% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2L9D48R4256P
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 rank8Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsDell PowerEdge R740
Dell PowerEdge R740XD
Dell PowerEdge R940
Dell PowerEdge T640

Other versions of this model

5 more in the same range

Questions about this item

Which server models must I already own for this 256 GB DDR4 2933 ECC LRDIMM kit to be compatible?

This kit is validated for Dell PowerEdge R740, R740XD, R940 and T640 servers.

Can I keep my existing DDR4 2133, 2400 or 2666 modules installed alongside these 2933 CL21 LRDIMMs?

The modules are backward-compatible with 2133 MHz, 2400 MHz and 2666 MHz speeds, but LRDIMMs cannot be mixed with unbuffered or registered ECC DIMMs.

How do I confirm the 2x128 GB 8Rx4 modules are running at 2933 MT/s with ECC active after installation?

Check the server BIOS or iDRAC memory configuration screen; it should report 256 GB total, 2933 MT/s speed and ECC Load Reduced status.

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