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Green rectangular circuit board with gold edge connectors and black memory chips on both sides

OWC

OWC 128GB DDR4 3200 ECC Registered RDIMM 288-pin 1.2V CL22 8Rx4 memory upgrade

SKU CH-5265-RKY0J

Single 128GB DDR4 3200 ECC registered RDIMM for compatible ASUS rack servers

  • Total capacity128 GB
  • Rated speedDDR4 3200 (PC4 25600)
  • CAS latency22
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4
  • 128GB single module expands server capacity
  • DDR4 3200 speed with CL22 latency
  • ECC registered design protects data integrity
  • 2V operation reduces power consumption
  • Validated for ASUS RS700A rack servers

128GB DDR4 ECC RDIMM for ASUS RS700A servers

This single 128GB module runs at DDR4 3200 with CL22 latency and 1.2V operation. It is built as an 8Rx4 registered DIMM with on-die ECC for data integrity. The part is validated for ASUS Rack Server RS700A-E11-RS12U, RS700A-E11-RS4U, RS700A-E9-RS12 and RS700A-E9-RS4 platforms. It will not work in standard desktop PCs or alongside unbuffered or load-reduced memory.

Thermals noise and power at 3200MHz

The module operates at the JEDEC-standard 1.2V, keeping power draw low for high-density server configurations. No heat spreader is fitted, so airflow across the 288-pin PCB manages thermals directly. Registered buffering reduces electrical loading on the memory controller, which helps maintain stable voltages during normal multi-threaded workloads. Silent operation is inherent with no moving parts.

Sustained load behaviour in registered ECC mode

Under continuous utilisation the registered design maintains signal integrity across all eight ranks per channel. ECC correction handles single-bit errors without halting the system, supporting uptime requirements in NAS and workstation roles. Backward compatibility with 2133, 2400, 2666 and 2933MHz buses allows deployment in mixed-speed populations. The module meets full JEDEC and RoHS compliance for long-term reliability.

How it compares

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

Price $755.99
Pricier than about 57% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB
Higher than about 70% of the 20,941 comparable items (median 32 GB).
CAS latency 22
Typical for this category: the median of 483 items is 22.
Price per GB $5.91 per GB
Cheaper than about 66% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameOWC
Part number3R2D48R4128G
Total capacity128 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 3200 (PC4 25600)
Memory
CAS latency22
ECC supportYes
Buffer typeRegistered
Memory rank8Rx4
Heat spreaderNo
Power
Rated voltage1.2 V

Questions about this item

How do I install this 288-pin DDR4 3200 ECC Registered RDIMM in my ASUS RS700A-E11-RS12U and what step is often missed?

Power down the server, open the chassis, align the module notch with the slot key, press firmly until both ejector clips lock, then enter the BIOS to confirm the 3200 MT/s speed and ECC function are active — skipping the BIOS check is the step most people miss.

What maintenance or replacement will this 128 GB 8Rx4 module need during its service life?

No scheduled maintenance is required; the module has no heat spreader and no moving parts, so replacement is only needed if a memory diagnostic reports uncorrectable ECC errors or the server fails to POST with the DIMM installed.

What is the first limit that appears when this CL22 1.2 V registered DIMM runs under sustained heavy load?

The CAS latency of 22 cycles at 3200 MT/s sets the baseline response time; under continuous throughput the memory controller will hit that latency ceiling before thermal or voltage limits become a factor.

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