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Four green DDR4 ECC registered DIMMs in static bags

OWC

OWC 64GB (4×16GB) DDR4 2933 CL21 2Rx4 ECC RDIMM PowerEdge C4140 memory upgrade

SKU CH-91RP-DMSA6

64 GB kit of four 16 GB DDR4 2933 CL21 ECC registered DIMMs for PowerEdge C4140 servers

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 64GB (4 x 16GB)

Show 4 more
  • ECC registered design protects data integrity in servers
  • 64GB kit with four 16GB modules expands capacity
  • DDR4 2933 CL21 speed matches system requirements
  • 2V operation reduces power draw in dense configs
  • Backward compatible with 2133 2400 2666MHz platforms

System-specific server memory

This kit provides 64 GB of DDR4 ECC registered RDIMM memory in four 16 GB modules. It is built for the Dell PowerEdge C4140 with Cascade Lake processors and will not work in standard desktop computers. The modules operate at 2933 MHz with CL21 latency and 1.2 V.

Straightforward DIMM installation

The 288-pin RDIMMs seat like any server memory; power down, open the chassis, align the notch and press until the latches click. Common issues arise when registered ECC modules are mixed with unbuffered or load-reduced DIMMs, which the platform does not support. Backward compatibility covers 2133, 2400 and 2666 MHz speeds.

Registered ECC with 2Rx4 organisation

The single specification that decides fit is the 2Rx4 registered ECC design at DDR4 2933. Systems requiring unbuffered, load-reduced or different rank configurations cannot use this kit. JEDEC and RoHS compliance ensures a warranty-safe upgrade for the validated platform.

How it compares

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

Price $461.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (4 × 16 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $7.22 per GB
Cheaper than about 56% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R9D42R4064S
Total capacity64 GB (4 × 16 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

5 more in the same range

Questions about this item

How can I verify the 64GB kit is running at 2933 MHz CL21 after installing it in my PowerEdge C4140?

Enter the BIOS or use a tool like dmidecode to confirm each 16GB module shows DDR4 2933 PC4-23400 CL21 2Rx4 1.2V ECC Registered and that the system reports 64GB total.

What comes in the box and is anything else required for installation?

The kit includes four 16GB 288-pin DDR4 ECC Registered RDIMM modules; no extra parts are needed — just open the server, populate the slots and power on.

Should I choose this 64GB (4×16GB) kit or a different capacity for my C4140 with Cascade Lake CPUs?

Select this 64GB kit when you need four 16GB 2Rx4 ECC Registered modules at 2933 MHz; choose another capacity only if your workload demands more or less total memory.

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