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Two green DDR4 RDIMM sticks, bare chips, no heat spreader

OWC

OWC 256GB (2x128GB) DDR4 3200MHz CL22 4Rx4 ECC Registered RDIMM 1.2V 288-pin Server RAM

SKU CH-R612-W5G5G

256GB dual-channel DDR4 3200MHz ECC registered server memory kit with CL22 latency and 1.2V operation

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR4 3200 (PC4 25600)
  • CAS latencyCL22
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank4Rx4

Capacity 256GB (2 x 128GB)

Show 4 more

Rank 4Rx4

  • 256 GB total capacity from two 128 GB modules
  • DDR4 3200 MHz speed for fast data throughput
  • ECC registered design detects and corrects memory errors
  • 2 V operation reduces server power draw
  • JEDEC and RoHS compliant for warranty-safe upgrades

Server DDR4 256GB kit for workstations

This OWC kit provides 256GB of DDR4 memory across two 128GB registered ECC RDIMMs. It is built for servers and workstations that require error-correcting registered modules running at 3200MHz with a CL22 latency. The dual-channel kit operates at 1.2V and conforms to JEDEC PC4-25600 specifications.

Simple DIMM installation with strict compatibility

The 288-pin modules install into standard DDR4 RDIMM slots without tools or heat spreaders to remove. The critical step is verifying that your platform supports 4Rx4 registered ECC memory, because these modules will not work in desktop boards that accept only unbuffered non-ECC DIMMs. Mixing them with unbuffered memory is also not supported and will prevent the system from posting.

Confirm registered ECC support and rank limits

Before ordering, check your motherboard or server documentation for explicit support of registered ECC RDIMMs and the maximum 4Rx4 rank configuration per channel. Ensure the system requires DDR4 3200MHz operation at 1.2V and can address the full 256GB capacity across the available slots. This kit is not suitable for standard desktop computers or any platform limited to unbuffered memory.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $1,495.99
Pricier than about 83% of the 6,523 comparable items (median $188.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $5.84 per GB
Cheaper than about 65% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number3R2D44R4256P
Total capacity256 GB (2 × 128 GB)
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 3200 (PC4 25600)
Memory
CAS latencyCL22
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

Questions about this item

How do I confirm the 256GB kit is running at 3200MHz CL22 after installation?

Enter the server BIOS or UEFI and verify the memory speed reads 3200MHz with CAS latency 22; the registered ECC modules will also report ECC active in the system health or IPMI interface.

What ships in the box and what must I source separately?

The package contains two 128GB 288-pin DDR4 3200MHz CL22 4Rx4 ECC registered RDIMMs; no heat spreaders, cables, tools or additional DIMMs are included.

Which capacity version should I choose for a dual-channel server board?

This 256GB dual-channel kit provides two matched 128GB modules, the correct population for a two-channel server memory architecture.

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