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

OWC

OWC 2L9D48R4256P 256GB (2x128GB) DDR4 2933 ECC LRDIMM memory upgrade

SKU CH-Z6SR-N5FB0

A 256 GB DDR4 2933 ECC load-reduced dual-rank kit for Supermicro X11SPD-F servers and workstations

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank8Rx4

Capacity 256GB (2 x 128GB)

  • 256 GB capacity from two 128 GB modules
  • DDR4 2933 MHz speed with CL21 latency
  • ECC load-reduced design for server reliability
  • 2 V operation reduces power draw
  • Compatible with Supermicro X11SPD-F motherboard

Server-grade ECC LRDIMM kit

This 256GB kit contains two 128GB DDR4 2933 modules built to the PC4-23400 standard with CL21 latency. Each stick is a 288-pin load-reduced DIMM operating at 1.2V and carrying 8Rx4 organisation with ECC. The kit is validated for the Supermicro X11SPD-F motherboard and will not work in standard desktop systems or alongside unbuffered or registered ECC memory.

Sustained workload stability

Load-reduced architecture lowers electrical load on the memory controller, allowing the full 256GB to run at the rated 2933 speed without the signal degradation that limits conventional registered DIMMs at high density. ECC corrects single-bit errors in real time, preventing silent data corruption during long compute runs, virtualisation workloads or ZFS storage pools. JEDEC-compliant 1.2V operation keeps thermals predictable inside densely populated server chassis.

Upgrade path for X11SPD-F platforms

The kit replaces lower-capacity DDR4 LRDIMM sets or fills empty slots on the X11SPD-F to reach the board's maximum supported memory. Backward compatibility with 2133, 2400 and 2666MHz buses lets the modules clock down automatically if the platform requires it. Buyers needing unbuffered desktop memory, registered ECC without load reduction, or capacities beyond 256GB per kit cannot use this product.

How it compares

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

Price $1,408.99
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 $5.50 per GB
Cheaper than about 70% 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 number2L9D48R4256P
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 rank8Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSupermicro Motherboard X11SPD-F

Other versions of this model

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Questions about this item

How much power does each 128GB DDR4 2933 LRDIMM draw at 1.2V during continuous server operation?

Each module runs at 1.2V, the standard DDR4 voltage for LRDIMMs, so power draw stays within JEDEC limits for 8Rx4 Load Reduced DIMMs at 2933 MT/s.

What motherboard slot and chipset support is required to run this 256GB kit at its rated 2933 speed?

The kit is validated for the Supermicro X11SPD-F motherboard with 288-pin DDR4 slots; the CPU and chipset on that board must support DDR4-2933 LRDIMM operation.

Can I add these 2933 MT/s LRDIMMs to a system that currently uses 2400 MT/s ECC registered DIMMs?

No — Load Reduced and Registered ECC DIMMs cannot be mixed, and the X11SPD-F requires all slots to use the same LRDIMM type.

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