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Green rectangular DDR4 RDIMM with black chips and gold contacts

OWC

OWC 256GB DDR4 3200 CL22 8Rx4 ECC Registered RDIMM memory upgrade

SKU CH-HX85-963B7

Single 256 GB DDR4 3200 CL22 8Rx4 ECC registered RDIMM for Supermicro H12 and H11 server boards

Capacity 256GB

  • 256 GB capacity expands server memory headroom
  • DDR4 3200 speed supports high-throughput workloads
  • ECC registered design protects data integrity
  • 2 V operation reduces power draw
  • Compatible with listed Supermicro motherboards

Single-module capacity

This OWC module provides 256GB of DDR4 ECC Registered memory in a single 288-pin RDIMM. It is built for Supermicro server boards including the H12DSG-O-CPU, H12DST-B, H12DSU-iN, H11DSI-NT and H11DST-B. The octal-rank 8Rx4 design targets workstations and servers that require registered ECC DRAM. It will not work in standard desktop computers or alongside unbuffered or load-reduced DIMMs.

Upgrade path

The kit replaces lower-capacity registered ECC DIMMs to maximise memory density per slot on the listed Supermicro platforms. It matches Samsung M393ABG40M52-CAE, Hynix HMAT14JXSRB120N and HMAT14JXSRB122N, and Supermicro MEM-DR425MI-ER32 part numbers. The jump is worthwhile when the workload demands more capacity than smaller RDIMMs can deliver within the same slot count. Builders who need unbuffered memory or load-reduced modules cannot use this product.

Sustained operation

Rated at 3200 MT/s with CL22 latency at 1.2V, the module meets JEDEC PC4-25600 specifications for continuous server duty. ECC correction and registered signalling maintain data integrity during extended multi-threaded workloads. OWC validates every DIMM in-house to ensure reliability under sustained load rather than only in short benchmarks. Mixing capacities, speeds or manufacturers is not recommended for optimal stability.

How it compares

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

Price $1,345.99
Pricier than about 63% 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

5 more in the same range

Questions about this item

Does the 288-pin DDR4 RDIMM fit the Supermicro H12DSG-O-CPU motherboard?

Yes, the module is listed as compatible with the H12DSG-O-CPU, H12DST-B, H12DSU-iN, H11DSI-NT and H11DST-B boards.

What is the correct seating procedure for the 256GB ECC Registered RDIMM?

Align the notch with the slot key, press down evenly until both side clips click, and verify the module is fully seated before closing the chassis.

When should the 256GB DDR4 3200 CL22 RDIMM be replaced in a server running continuously?

ECC Registered DIMMs have no fixed service interval; replace only if memory diagnostics report uncorrectable errors or the module fails POST.

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