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Green bare circuit board DDR4 288-pin RDIMM module with black chips

OWC

OWC 16GB DDR4 2933 CL21 2Rx4 288-pin 1.2V ECC Registered RDIMM memory upgrade

SKU CH-91HP-RHZEM

16 GB DDR4-2933 ECC registered RDIMM, CL21 1.2 V, single 2Rx4 module for PowerEdge C4140 Cascade Lake servers

  • Total capacity16 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 16GB

Show 4 more
  • ECC registered design protects data integrity in servers
  • 16GB capacity expands memory for virtualisation workloads
  • 2933MHz DDR4 speed matches PowerEdge C4140 specifications
  • 2V operation reduces power draw per module
  • JEDEC compliant build ensures warranty safe upgrade

Server ECC RDIMM upgrade

This 16GB DDR4 2933 ECC registered RDIMM is built for the Dell PowerEdge C4140 with Cascade Lake CPUs. It targets administrators extending the life of existing server infrastructure or building cost-effective replacements. The module follows JEDEC PC4-23400 timing at 1.2V and carries a 2Rx4 organisation. It will not work in standard desktop PCs, consumer NAS boxes, or any platform that requires unbuffered or load-reduced DIMMs.

Tool-free DIMM installation

Installation follows normal server DIMM procedure: power down, open the chassis, align the 288-pin key and press until the ejector tabs click. No heat spreader means the module sits low under standard air baffles. The most common error is mixing this registered ECC stick with unbuffered or load-reduced memory, which prevents the system from posting. Verify every slot uses identical registered ECC parts before closing the case.

16GB capacity headroom

A single 16GB rank pair handles typical virtualisation hosts, database buffers and multi-tenant workloads on the C4140. The module also runs at 2133, 2400 and 2666 MT/s if the CPU or BIOS caps memory speed. Capacity runs out when workloads demand more than the board's maximum DIMM count allows or when applications exceed per-channel bandwidth at lower speeds. Buyers needing larger per-DIMM densities or load-reduced ECC must choose a different module.

How it compares

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

Price $110.99
Cheaper than about 66% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $6.94 per GB
Cheaper than about 58% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameOWC
Part number2R9D42R416 GB
Total capacity16 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 verify the 16GB DDR4 2933 CL21 module is recognised at full speed after installing it in my PowerEdge C4140?

Enter the system BIOS or UEFI and confirm the installed memory shows 16GB at 2933MHz with ECC Registered status. The POST memory test should pass without errors.

What comes in the box with the OWC 2R9D42R416GB module and do I need any extra parts for installation?

The package contains a single 16GB 288-pin DDR4 ECC Registered RDIMM. No additional components are required; the module inserts directly into an available DIMM slot on the PowerEdge C4140 motherboard.

Which capacity and speed version should I choose for a PowerEdge C4140 running Cascade Lake CPUs?

This 16GB DDR4 2933 (PC4-23400) CL21 2Rx4 1.2V ECC Registered RDIMM is the specified match. It also runs at 2133, 2400 or 2666MHz if the platform requires a lower speed.

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