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Four green DDR4 288-pin RDIMM modules in a row

OWC

OWC 256GB (4×64GB) DDR4 2933 CL21 ECC Registered RDIMM PowerEdge C4140

SKU CH-24QK-5B0J6

A 256 GB kit of four 64 GB DDR4 2933 ECC registered RDIMMs validated for the Dell PowerEdge C4140 with Cascade Lake CPUs

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 256GB (4 x 64GB)

Show 4 more
  • 256 GB total capacity from four 64 GB modules
  • DDR4 2933 MT/s speed rated at PC4-23400 CL21
  • ECC registered design detects and corrects single-bit errors
  • 2 V operation reduces power draw in dense servers
  • Backward compatible with 2133, 2400 and 2666 MT/s systems

OWC 256GB DDR4 ECC RDIMM kit

This 256GB kit contains four 64GB DDR4 2933 PC4-23400 CL21 2Rx4 288-pin 1.2V ECC Registered DIMMs. It is built for the PowerEdge C4140 with CascadeLake CPUs and suits server, workstation or NAS workloads that require registered ECC memory.

Installation notes for registered ECC

Modules install like standard DIMMs but the system must support registered ECC DDR4. The kit cannot be mixed with unbuffered or load-reduced ECC memory. Backward compatibility with 2133MHz, 2400MHz and 2666MHz speeds is specified by the manufacturer.

Verify your C4140 configuration

Confirm the server uses CascadeLake processors and that all memory slots accept registered ECC RDIMMs. Check current module population rules before adding this 4×64GB kit. Ensure the BIOS is updated for full 256GB capacity support.

How it compares

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

Price $1,508.99
Pricier than about 65% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (4 × 64 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $5.89 per GB
Cheaper than about 66% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R9D42R4256S
Total capacity256 GB (4 × 64 GB)
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsPowerEdge C4140 (CascadeLake CPU)

Other versions of this model

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Questions about this item

How can I confirm the 2933 MHz CL21 ECC registered kit is running correctly in my PowerEdge C4140 after installation?

Enter the BIOS or iDRAC on the PowerEdge C4140 and verify each of the four 64 GB modules shows 2933 MT/s, CL21 timings, 1.2 V, ECC registered and 2Rx4 organisation.

What does the 256 GB kit contain and is anything else required to use it in a C4140?

The box holds four 64 GB 288-pin DDR4 ECC registered RDIMMs; no extra parts are needed for a compatible PowerEdge C4140 with Cascade Lake CPUs.

Which capacity version should I choose for a PowerEdge C4140 that supports 64 GB RDIMMs?

Select this 256 GB kit (4 × 64 GB) when the server takes 64 GB registered modules and you want the full 256 GB upgrade.

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