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Two green DDR4 LRDIMM sticks with gold contacts and black chips

OWC

OWC 256GB (2x128GB) DDR4 2933 CL21 8Rx4 288-pin 1.2V ECC Load Reduced LRDIMM memory upgrade

SKU CH-91H5-542CW

256GB DDR4-2933 ECC Load-Reduced LRDIMM kit (2×128GB, CL21, 1.2V) for PowerEdge C4140 Cascade Lake servers

  • Capacity256GB (2 x 128GB)
  • Type288-Pin DDR4 ECC LRDIMM
  • SpeedDDR4 2933 (PC4 23400)
  • CAS LatencyCL21
  • Voltage1.2V
  • ECCYes

Capacity 256GB (2 x 128GB)

Show 4 more configurations
  • 256 GB total capacity from two 128 GB modules
  • DDR4 2933 MHz speed with CL21 latency for server workloads
  • ECC load-reduced design protects data integrity in critical systems
  • 2 V operation reduces power draw in dense configurations
  • Backward compatible with 2133, 2400 and 2666 MHz platforms

Server-grade ECC LRDIMM kit

This 256GB kit contains two 128GB DDR4 2933 LRDIMM modules built for the PowerEdge C4140 with CascadeLake CPUs. It delivers registered ECC load-reduced operation at 1.2V with CL21 latency. The 8Rx4 organisation and 288-pin form factor are validated for server and workstation platforms only.

Load-reduced architecture changes compatibility

The load-reduced design reduces electrical load on the memory bus, allowing higher capacities per channel than standard registered DIMMs. It cannot be mixed with unbuffered or standard registered ECC modules. Backward compatibility covers 2133, 2400 and 2666MHz speeds, so the kit will downclock if the system requires it.

8Rx4 rank structure decides fit

The 8Rx4 configuration determines whether the motherboard memory controller can address the full 256GB across two slots. Systems that do not support 8-rank load-reduced modules will not recognise the capacity. Verify the C4140 BIOS and CPU memory-controller limits before ordering.

Highlights

  • 256 GB total capacity from two 128 GB modules
  • DDR4 2933 MHz speed with CL21 latency for server workloads
  • ECC load-reduced design protects data integrity in critical systems
  • 2 V operation reduces power draw in dense configurations
  • Backward compatible with 2133, 2400 and 2666 MHz platforms

Specifications

BrandOWC
Part Number2L9D48R4256P
Capacity256GB (2 x 128GB)
Type288-Pin DDR4 ECC LRDIMM
SpeedDDR4 2933 (PC4 23400)
CAS LatencyCL21
Voltage1.2V
ECCYes
Buffered/RegisteredLoad Reduced
Rank8Rx4
Heat SpreaderNo
Compatible SystemPowerEdge C4140 (CascadeLake CPU)

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Questions about this item

Will the 8Rx4 LRDIMM modules need any firmware updates or scheduled replacement in a PowerEdge C4140?

No firmware updates are required for the 8Rx4 LRDIMM modules; they are designed to run for the server's lifespan without scheduled replacement.

What is the first limit reached when the 256GB kit runs at 2933MHz continuously in a Cascade Lake system?

The CAS latency of CL21 at 1.2V sets the timing boundary before thermal or power limits are reached.

How much heat and power do the two 128GB LRDIMMs produce when the server runs all day at 2933MHz?

Each module operates at 1.2V without a heat spreader; total power draw stays within standard DDR4 LRDIMM limits for 24/7 operation.

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