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Two green 288-pin DDR4 ECC LRDIMM modules with black chips, no heat spreaders

OWC

OWC 256GB (2x128GB) DDR4 2933 ECC LRDIMM memory upgrade

SKU CH-CF2V-KYBCX

256 GB DDR4 2933 ECC load-reduced dual-rank kit for Supermicro H12SST-PS servers

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank4Rx4

Capacity 256GB (2 x 128GB)

  • ECC load-reduced design protects data integrity in servers
  • 256GB total capacity across two 128GB modules
  • DDR4 2933 speed with CL21 latency at 1.2V
  • JEDEC and RoHS compliant for warranty-safe upgrades
  • Backward compatible with 2133, 2400 and 2666MHz systems

System-specific ECC LRDIMM kit

This 256 GB kit contains two 128 GB DDR4 2933 LRDIMM modules built for the Supermicro H12SST-PS motherboard. It is designed for servers, workstations and NAS systems that require load-reduced ECC memory. The modules will not work in standard desktop computers and cannot be mixed with unbuffered or registered ECC DIMMs.

Thermals and power draw

Each module runs at 1.2 V with no heat spreader, relying on system airflow for cooling. Power consumption scales with the 4Rx4 organisation and CL21 latency at the rated 2933 MT/s speed. Acoustic characteristics depend entirely on the host chassis and fan profile, not on the memory itself.

Deciding specification

The load-reduced ECC design with 4Rx4 rank structure is the single factor that determines compatibility; only platforms that explicitly support LRDIMM can use this kit. Buyers needing unbuffered or registered ECC memory must choose a different module type.

How it compares

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

Price $1,464.99
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 $5.72 per GB
Cheaper than about 68% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2L9D44R4256P
Total capacity256 GB (2 × 128 GB)
Product type288-Pin DDR4 ECC LRDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeLoad Reduced
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSupermicro Motherboard H12SST-PS

Other versions of this model

5 more in the same range

Questions about this item

How do I install the 288-pin DDR4 ECC LRDIMM modules in the Supermicro H12SST-PS, and what step is commonly missed?

Power down the server, open the chassis, align each 288-pin LRDIMM with the slot key, press firmly until the ejector tabs click, then verify in BIOS that all 256 GB (2×128 GB) are detected at 2933 MT/s; the step often missed is seating both modules in the correct channel pair for quad-rank operation.

What maintenance or replacement will the 128 GB LRDIMM kit need over its service life?

The modules have no heat spreaders and no moving parts, so routine maintenance is limited to keeping server airflow paths clean; replacement is only required if a module fails ECC correction or the platform is upgraded beyond DDR4 2933.

What limit appears first when the 4Rx4 LRDIMMs run sustained workloads at 1.2 V?

The quad-rank 4Rx4 organisation increases electrical loading on the memory controller, so the first limit under sustained use is typically the platform's maximum supported rank count per channel, which caps total capacity before thermal or voltage limits are reached.

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