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Four green 288-pin DDR4 ECC registered DIMMs in a row

OWC

OWC 128GB (4×32GB) DDR4 2933 ECC Registered RDIMM memory upgrade

SKU CH-1351-DSJ95

128 GB DDR4 2933 ECC registered RDIMM kit of four 32 GB modules for PowerEdge C4140 servers

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 128GB (4 x 32GB)

Show 4 more
  • 128GB kit expands server capacity with four 32GB modules
  • ECC registered design protects data integrity in critical workloads
  • 2933MHz CL21 speed delivers responsive performance for demanding applications
  • 2V operation reduces power draw and heat output
  • Compatible with PowerEdge C4140 SkyLake systems and backward compatible to 2133, 2400, 2666MHz

128GB DDR4 ECC RDIMM Kit

This kit supplies 128GB of DDR4 2933 registered ECC memory in four 32GB modules. It is built for Dell PowerEdge C4140 servers running SkyLake CPUs and replaces Dell part numbers 8WKDY, AA579531, AA601616, AB003153, SNP8WKDYC/32G and SNP8WKDYC/32VXR. Modules run at 1.2V with CL21 latency and a 2Rx4 rank layout.

Works in PowerEdge C4140 only

The memory fits the PowerEdge C4140 (SkyLake CPU) and other systems that accept DDR4 288-pin registered ECC RDIMMs. It will not work in standard desktops, laptops or consumer motherboards that require unbuffered non-ECC modules. Buyers who need unbuffered memory or load-reduced DIMMs must choose a different product type.

Registered ECC with 2Rx4 organisation

Each module uses a 2Rx4 registered ECC organisation, which is the single specification that determines compatibility with the server memory controller. Mixing these sticks with unbuffered or load-reduced DIMMs will prevent the system from posting. Verify that your platform requires registered ECC RDIMMs before ordering.

How it compares

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

Price $858.99
Pricier than about 59% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $6.71 per GB
Cheaper than about 59% 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 number2R9D42R4128S
Total capacity128 GB (4 × 32 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 (SkyLake CPU)

Other versions of this model

5 more in the same range

Questions about this item

What server or workstation must I already have for this 128 GB DDR4 2933 ECC RDIMM kit to work?

The kit is validated for the Dell PowerEdge C4140 with SkyLake CPUs and replaces Dell part numbers 8WKDY AA579531 AA601616 AB003153 SNP8WKDYC/32G SNP8WKDYC/32VXR.

Can I keep my existing 2133 MHz, 2400 MHz or 2666 MHz DDR4 ECC registered modules and add these four 32 GB sticks?

Yes, the modules are backward compatible with 2133 MHz, 2400 MHz and 2666 MHz speeds, but all populated slots must use ECC registered DIMMs — mixing with unbuffered or load-reduced memory is not supported.

How do I confirm the kit is running at the correct 2933 MHz CL21 1.2 V settings after installation?

Check the BIOS or system management console; it should report each module as 32 GB DDR4 2933 PC4-23400 CL21 2Rx4 registered ECC at 1.2 V, totalling 128 GB.

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