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Eight green DDR4 RDIMM sticks in anti-static tray

OWC

OWC 256GB (8x32GB) DDR4 2933 ECC Registered RDIMM memory upgrade

SKU CH-DQQR-WDEM8

Eight 32 GB DDR4 2933 ECC registered RDIMMs totalling 256 GB for PowerEdge C4140 servers

  • Capacity256GB (8 x 32GB)
  • Type288-Pin DDR4 ECC RDIMM
  • SpeedDDR4 2933 (PC4 23400)
  • CAS LatencyCL21
  • Voltage1.2V
  • ECCYes

Capacity 256GB (8 x 32GB)

Show 4 more configurations
  • 256 GB kit lets servers handle heavy workloads
  • Eight 32 GB modules fill every slot for maximum density
  • DDR4 2933 CL21 registered ECC protects data integrity
  • 2 V operation reduces power draw under load
  • Backward compatible with 2133, 2400 and 2666 MHz platforms

Server-grade ECC RDIMM kit

This OWC kit delivers 256 GB of DDR4 2933 registered ECC memory across eight 32 GB modules. It is built for the Dell PowerEdge C4140 with SkyLake CPUs and will not work in standard desktop PCs. Each module runs at 1.2 V with CL21 latency and a 2Rx4 organisation. The registered buffer and error-correcting code suit workloads that demand data integrity.

Fits C4140 memory slots directly

The 288-pin RDIMMs install into the server’s existing DIMM sockets without adapters or risers. Backward compatibility with 2133, 2400 and 2666 MHz buses lets the kit run in mixed-speed configurations if required. Because the modules are registered ECC, they cannot be mixed with unbuffered or load-reduced DIMMs; the platform must support registered ECC throughout. Eight modules populate the full channel set for maximum bandwidth.

Replaces Dell 32 GB RDIMM parts

The kit substitutes Dell part numbers including 8WKDY, AA579531, AA601616, AB003153, SNP8WKDYC/32G and SNP8WKDYC/32VXR. Upgrading from smaller-capacity registered ECC DIMMs to this 256 GB set increases memory headroom for virtualisation, databases or large datasets. The jump is worthwhile when the current configuration hits capacity limits or when building a new C4140 and the budget favours a single high-density kit over multiple smaller kits.

Highlights

  • 256 GB kit lets servers handle heavy workloads
  • Eight 32 GB modules fill every slot for maximum density
  • DDR4 2933 CL21 registered ECC protects data integrity
  • 2 V operation reduces power draw under load
  • Backward compatible with 2133, 2400 and 2666 MHz platforms

Specifications

BrandOWC
Part Number2R9D42R4256K
Capacity256GB (8 x 32GB)
Type288-Pin DDR4 ECC RDIMM
SpeedDDR4 2933 (PC4 23400)
CAS LatencyCL21
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo
Compatible SystemPowerEdge C4140 (SkyLake CPU)

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Questions about this item

What is the CAS latency that limits sustained throughput on these CL21 modules?

The modules run at CL21, so the memory controller waits 21 cycles for each column access during sustained workloads.

How much heat do the 1.2 V registered DIMMs produce when the server runs all day?

Each DIMM operates at 1.2 V without a heat spreader, so thermal output stays low enough for standard server airflow.

Which Dell PowerEdge model must already be installed for this 288-pin kit to work?

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

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