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Four green 288-pin DDR4 LRDIMM modules with black chips and gold contacts

OWC

OWC 512GB (4x128GB) DDR4 2933 CL21 4Rx4 LRDIMM ECC memory upgrade

SKU CH-EC4B-FKP71

512GB DDR4 ECC LRDIMM kit with four 128GB modules at 2933MHz CL21 for Supermicro H12SST-PS servers

  • Total capacity512 GB (4 × 128 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank4Rx4

Capacity 512GB (4 x 128GB)

  • 512 GB total capacity with four 128 GB modules
  • DDR4 2933 MHz speed rated at PC4-23400
  • CL21 CAS latency at 1.2 V operating voltage
  • ECC load-reduced 4Rx4 design for server stability
  • JEDEC and RoHS compliant for warranty-safe upgrade

Server-grade capacity kit

This OWC upgrade kit delivers 512GB across four 128GB DDR4 2933 LRDIMM modules. It targets the Supermicro H12SST-PS motherboard in server or workstation roles that demand high-density ECC memory.

Build integration

Each 288-pin module runs at 1.2V with CL21 timing and 4Rx4 organisation. The load-reduced design reduces electrical load on the memory controller, freeing headroom for fully populated slots. Backward compatibility covers 2133, 2400 and 2666MHz bus speeds.

Fit and exclusions

Suits administrators expanding a compatible Supermicro platform with JEDEC-standard LRDIMM memory. Not for standard desktop boards, consumer laptops or any system requiring unbuffered or registered ECC DIMMs, as the load-reduced protocol is electrically incompatible.

How it compares

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

Price $3,001.99
Pricier than about 73% of the 21,161 comparable items (median $397.99).
Total capacity 512 GB (4 × 128 GB)
Higher than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $5.86 per GB
Cheaper than about 67% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2L9D44R4512S
Total capacity512 GB (4 × 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

Will the CL21 latency at DDR4 2933 become a bottleneck during sustained all-core workloads?

CL21 is the rated CAS latency for this DDR4 2933 kit. The 4Rx4 Load Reduced organisation keeps electrical loading low so the memory controller can maintain that timing across all twelve ranks under continuous use.

How much heat and power do four 128 GB LRDIMMs add when the server runs 24/7?

Each module runs at 1.2 V with no heat spreader; Load Reduced buffering cuts per-DIMM power versus standard registered DIMMs, so total thermal output stays within typical server DIMM limits for the H12SST-PS platform.

What must the Supermicro H12SST-PS already have for this 512 GB kit to work?

The board needs a CPU and BIOS that support DDR4 2933 (or 2133/2400/2666) LRDIMM ECC memory and at least four free 288-pin slots; the modules cannot be mixed with unbuffered or registered ECC DIMMs.

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