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Green printed circuit board with black memory chips and gold edge contacts

OWC

OWC 128GB DDR4 2933 CL21 4Rx4 ECC LRDIMM memory upgrade

SKU CH-MFJ8-KNTMR

Single 128GB DDR4 2933 CL21 ECC load-reduced DIMM for Supermicro H12SST-PS servers

  • Capacity128GB
  • Type288-Pin DDR4 ECC LRDIMM
  • SpeedDDR4 2933 (PC4 23400)
  • CAS LatencyCL21
  • Voltage1.2V
  • ECCYes

Capacity 128GB

Struck-through versions exist but are not stocked here.

  • 128 GB single-module capacity simplifies server upgrades
  • ECC load-reduced design supports data integrity in critical workloads
  • DDR4 2933 CL21 at 1.2 V balances speed and efficiency
  • 4Rx4 288-pin form factor fits Supermicro H12SST-PS motherboards
  • JEDEC and RoHS compliant for warranty-safe deployment

Product Identity

This is a single 128GB DDR4 ECC load-reduced DIMM rated at 2933 MT/s with CL21 latency and 1.2V operation. It uses a 288-pin 4Rx4 layout and is validated for the Supermicro H12SST-PS motherboard.

Target Audience

The module suits administrators expanding a compatible Supermicro server or workstation that requires registered ECC memory. It will not work in standard desktop boards and cannot be mixed with unbuffered or standard registered DIMMs.

Capacity and Headroom

One stick delivers 128GB of error-correcting capacity for memory-intensive server workloads. The DDR4 2933 rating also supports backward operation at 2133, 2400 and 2666 MT/s, but the module cannot serve systems that demand unbuffered or non-ECC memory.

Highlights

  • 128 GB single-module capacity simplifies server upgrades
  • ECC load-reduced design supports data integrity in critical workloads
  • DDR4 2933 CL21 at 1.2 V balances speed and efficiency
  • 4Rx4 288-pin form factor fits Supermicro H12SST-PS motherboards
  • JEDEC and RoHS compliant for warranty-safe deployment

Specifications

BrandOWC
Part Number2L9D44R4128G
Capacity128GB
Type288-Pin DDR4 ECC LRDIMM
SpeedDDR4 2933 (PC4 23400)
CAS LatencyCL21
Voltage1.2V
ECCYes
Buffered/RegisteredLoad Reduced
Rank4Rx4
Heat SpreaderNo
Compatible SystemSupermicro Motherboard H12SST-PS

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

Do I need a Supermicro H12SST-PS motherboard with DDR4 LRDIMM support to use this 128GB module?

Yes, this 128GB DDR4 2933 CL21 4Rx4 ECC LRDIMM is validated for the Supermicro H12SST-PS motherboard. The board must accept 288-pin DDR4 Load Reduced DIMMs at 1.2V.

Can I run this 2933MHz LRDIMM alongside existing 2400MHz ECC LRDIMMs in the same server?

The module is backward compatible with 2133, 2400 and 2666MHz speeds. All installed LRDIMMs will run at the lowest common speed and must share the same Load Reduced architecture.

How can I confirm the 128GB LRDIMM is detected at 2933MHz with ECC active after installation?

Check the BIOS memory information or run a system utility such as dmidecode; it should show 128GB, 2933MHz (PC4-23400), CL21, 4Rx4, ECC Load Reduced and 1.2V operation.

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