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Four green 288-pin DDR4 LRDIMM modules, bare PCB with black chips, no heat spreaders

OWC

OWC 256GB (4x64GB) DDR4 2933MHz CL21 ECC Load Reduced LRDIMM 1.2V 288-pin Server RAM

SKU CH-0PDK-D51VH

ECC load-reduced DDR4 kit delivers 256 GB across four 64 GB modules at 2933 MHz CL21 for server and workstation upgrades

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank4Rx4

Capacity 256GB (4 x 64GB)

  • ECC Load Reduced design ensures data integrity for server workloads
  • 256 GB total capacity across four 64 GB modules
  • DDR4 2933 MHz speed with CL21 latency
  • 2 V operation reduces power draw
  • Backward compatible with 2133, 2400 and 2666 MHz systems

Server ECC LRDIMM kit

This 256GB kit contains four 64GB DDR4 ECC Load Reduced DIMMs rated at 2933MHz CL21. The modules run at 1.2V and use a 288-pin form factor designed for server and workstation platforms. They are built to JEDEC specifications and carry ROHS compliance.

Verify platform support

Your motherboard must accept DDR4 ECC Load Reduced DIMMs in a 288-pin slot and support 4Rx4 module organisation. Standard desktop boards cannot use this memory and it cannot be mixed with unbuffered DIMMs. Confirm the system also accepts the 2933MHz speed or one of the listed backward-compatible speeds.

Build integration

Each module operates without a heat spreader, so airflow across the DIMM area is required. The kit populates four slots in a dual-channel configuration, freeing remaining slots for further expansion if the platform allows. Installation follows standard server DIMM procedures.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $1,765.99
Pricier than about 85% of the 6,523 comparable items (median $188.99).
Total capacity 256 GB (4 × 64 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $6.90 per GB
Typical for this category: the median of 6,064 items is $7.25 per GB.

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Specifications

Product
Brand nameOWC
Part number2L9D44R4256S
Total capacity256 GB (4 × 64 GB)
Product type288-Pin DDR4 ECC LRDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeLoad Reduced
Memory rank4Rx4
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

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Questions about this item

What comes in the box and is anything else needed to install it?

The box contains four 64 GB DDR4 2933 MHz CL21 ECC LRDIMM modules for a total of 256 GB. No extra parts are required if the server has four free 288-pin DDR4 slots that support load-reduced memory.

The kit is only sold as 4 × 64 GB — when would I choose this capacity over a smaller kit?

Choose this 256 GB kit when the workload needs the maximum rank density the platform allows, such as virtualisation hosts or in-memory databases that benefit from 4Rx4 organisation across four channels.

The headline speed is 2933 MHz — what does that mean once the modules are in a real server?

The modules run at 2933 MHz CL21 at 1.2 V; if the platform only supports 2666, 2400 or 2133 MHz they will down-clock automatically while keeping ECC and load-reduced operation.

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