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Four green DDR4 RDIMM modules in static bags

OWC

OWC 1TB (4x256GB) DDR4 3200 PC4-25600 CL22 8Rx4 288-pin 1.2V ECC Registered RDIMM memory upgrade

SKU CH-18XY-K0SWS

A 1 TB kit of four 256 GB DDR4 3200 ECC registered RDIMMs validated for specific Supermicro server boards

Capacity 1TB (4 x 256GB)

  • 1TB server upgrade with four 256GB modules
  • DDR4 3200 ECC registered RDIMM for data integrity
  • CL22 8Rx4 octal-rank 288-pin 1.2V spec
  • Validated for Supermicro H12SSL and H12SSW boards
  • JEDEC and RoHS compliant for warranty-safe installs

OWC 1 TB DDR4 3200 ECC Registered Kit

This upgrade kit provides 1 TB of DDR4 3200 ECC Registered memory across four 256 GB RDIMMs. It is built for Supermicro H12SSL and H12SSW motherboards that require registered DIMMs. Each module runs at 1.2 V with CL22 latency and an 8Rx4 organisation. The kit is intended for servers and workstations that support this specific registered format.

Suited for compatible Supermicro servers.

The modules fit Supermicro H12SSL-CT, H12SSL-i, H12SSL-NT, H12SSW-iNR and H12SSW-NTR boards. They will not work in standard desktop computers that accept only unbuffered memory. Builders who need unbuffered or load-reduced DIMMs must choose a different product. Mixing this registered memory with other memory types is not supported.

256 GB per module registered RDIMM

Each of the four DIMMs delivers 256 GB in an 8Rx4 registered configuration. This single-module density determines whether the motherboard can reach the full 1 TB capacity with four slots. Verify that the target board accepts 256 GB registered RDIMMs before purchasing.

How it compares

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

Price $5,900.99
Pricier than about 81% of the 21,161 comparable items (median $397.99).

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Specifications

No published specifications for this item yet.

Other versions of this model

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Questions about this item

Will the 8Rx4 256GB modules need any firmware updates or replacement over time?

The DDR4 3200 modules are JEDEC compliant and validated against Samsung M393ABG40M52-CAE and Hynix HMAT14JXSRB120N reference parts. No firmware updates are required for the memory itself; motherboard BIOS updates should be applied per Supermicro guidance.

What limit appears first when the 1 TB kit runs at CL22 continuously?

Sustained operation at DDR4 3200 CL22 is bounded by the platform memory-controller thermal and power envelope. The registered buffer and on-die ECC add latency overhead, so the memory controller’s maximum sustained bandwidth is reached before the DRAM devices hit their thermal ceiling.

How much heat and power do the four 1.2 V 288-pin RDIMMs generate under all-day load?

Each 256 GB 8Rx4 RDIMM operates at 1.2 V within JEDEC DDR4 limits. Total kit power scales with active rank count and access pattern; the registered design reduces electrical loading on the bus, keeping per-module thermals within standard server airflow specifications.

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