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Two green DDR4 ECC registered RDIMM modules with gold contacts

OWC

OWC 256GB (2x128GB) DDR4 2933 PC4-23400 CL21 8Rx4 288-pin 1.2V ECC Registered RDIMM memory upgrade

SKU CH-B6Q0-JBR5M

Two-module kit provides 256 GB of DDR4-2933 ECC registered RDIMM memory for PowerEdge C4140 servers with SkyLake CPUs

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4

Capacity 256GB (2 x 128GB)

Show 4 more
  • 256 GB total capacity from two 128 GB modules
  • ECC registered design detects and corrects memory errors
  • DDR4 2933 speed with CL21 latency for server workloads
  • 2 V operation reduces power draw in dense configurations
  • Backward compatible with 2133, 2400 and 2666 MHz systems

Server memory upgrade

This kit provides 256 GB of DDR4 ECC registered memory in two 128 GB modules. It is built for the Dell PowerEdge C4140 with SkyLake processors. Workstations and servers that require registered DIMMs are the intended platforms. Standard desktop computers cannot use this memory.

Registered DIMM form factor

The 288-pin registered design adds a buffer that stabilises heavy memory loads in multi-socket servers. ECC circuitry detects and corrects single-bit errors to protect data integrity. Modules operate at 1.2 V without a heat spreader. They cannot be mixed with unbuffered or load-reduced DIMMs.

2933 MHz CL21 speed rating

Rated at DDR4 2933 (PC4-23400) with CAS latency 21, the kit also runs at 2133, 2400 or 2666 MHz if the system requires a lower speed. Buyers needing a different capacity, rank configuration or unbuffered memory must choose another product.

How it compares

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

Price $1,416.99
Pricier than about 64% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $5.54 per GB
Cheaper than about 70% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R9D48R4256P
Total capacity256 GB (2 × 128 GB)
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeRegistered
Memory rank8Rx4
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

Will DDR4 2933 PC4-23400 run at 2933 MHz or drop to 2666 MHz in a PowerEdge C4140?

The kit is rated DDR4 2933 PC4-23400; it will run at 2933 MHz if the platform supports that speed, otherwise it falls back to 2666 MHz, 2400 MHz or 2133 MHz.

Do the 288-pin RDIMMs fit the DIMM slots in a PowerEdge C4140?

Yes, the modules are 288-pin DDR4 ECC Registered RDIMMs, the form factor specified for the PowerEdge C4140.

What is the correct way to install the two 128 GB RDIMMs in a PowerEdge C4140?

Power down, open the chassis, align each module’s notch with the slot key, press firmly until the retention clips click; the common mistake is not seating both clips fully.

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