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Two green circuit boards with gold edge connectors and black memory chips

OWC

OWC 256GB (2x128GB) DDR4 2933 PC4-23400 CL21 4Rx4 288-pin 1.2V ECC LRDIMM memory upgrade

SKU CH-30VB-JYN9R

256 GB DDR4-2933 ECC LRDIMM kit (2×128 GB) validated for Supermicro X11 server and workstation boards

  • 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)

  • 256GB total capacity with two 128GB modules for high-density server memory
  • DDR4 2933MHz PC4-23400 speed with CL21 latency for responsive workloads
  • ECC load-reduced design detects and corrects data errors in critical systems
  • 2V operation reduces power draw while maintaining 2933MHz performance
  • Compatible with Supermicro X11DPD-L, X11DPD-M25, X11DPFF-SNR, X11QPL and X11SPA-T motherboards

Server-grade ECC LRDIMM kit

This 256GB kit provides two 128GB DDR4 2933 PC4-23400 CL21 4Rx4 288-pin 1.2V ECC Load Reduced DIMMs. It is built for Supermicro X11 series motherboards including X11DPD-L, X11DPD-M25, X11DPFF-SNR, X11QPL and X11SPA-T. The modules target servers, workstations and NAS systems that require registered ECC memory with load-reduced buffering. They will not work in standard desktop computers or alongside unbuffered or registered ECC DIMMs.

Load-reduced ECC architecture

The single specification that decides fit is the Load Reduced ECC design combined with 4Rx4 organisation. This electrical interface differs from standard registered ECC and unbuffered DIMMs, so the motherboard memory controller must explicitly support LRDIMM operation. Mixing with other ECC types is not supported and will prevent boot or cause data errors.

Sustained server workloads

Under continuous load the modules operate at the rated 2933 MT/s with CL21 latency at 1.2V, and they are backward compatible with 2133, 2400 and 2666 MT/s bus speeds. JEDEC-standard construction and 100% factory testing ensure stable throughput during extended compute, virtualisation or storage tasks without the error accumulation that can occur with non-ECC memory.

How it compares

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

Price $1,429.99
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 $5.59 per GB
Cheaper than about 69% 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 X11DPD-L
Supermicro Motherboard X11DPD-M25
Supermicro Motherboard X11DPFF-SNR
Supermicro Motherboard X11QPL
Supermicro Motherboard X11SPA-T

Other versions of this model

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Questions about this item

What does the 2933 MT/s rating mean once the modules are installed?

The kit runs at DDR4 2933 (PC4-23400) with CL21 latency, delivering that data rate on any supported Supermicro X11 platform.

What does the PC4-23400 designation cap in practice?

PC4-23400 is the JEDEC standard name for DDR4 2933; the modules will also operate at 2666, 2400 or 2133 MT/s if the system requires a lower speed.

What physical slot and clearance do the 288-pin LRDIMMs need?

Each 128 GB module uses a standard 288-pin DDR4 DIMM slot with no heat spreader, so it fits any compatible Supermicro X11 motherboard DIMM socket.

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