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Green circuit board with gold contacts and black memory chips

OWC

OWC 128GB DDR4 2933 CL21 4Rx4 288-pin 1.2V ECC Load Reduced DIMM server RAM

SKU CH-SA2T-VXXJ7

128GB DDR4 2933MHz ECC load-reduced DIMM for servers and workstations, 288-pin CL21 1.2V module compatible with Fujitsu part numbers

  • Total capacity128 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank4Rx4
  • 128 GB capacity expands server memory headroom
  • DDR4 2933 speed with CL21 latency delivers responsive throughput
  • ECC load-reduced design protects data integrity under heavy loads
  • 2 V operation reduces power draw per module
  • Backward compatible with 2133, 2400 and 2666 MHz systems

Server-grade 128GB DDR4 LRDIMM

This module is a 128GB DDR4 2933 ECC load-reduced DIMM built for servers, workstations and NAS systems. It targets administrators who need high-capacity registered memory with error correction for 24/7 workloads. The 288-pin form factor fits DDR4 server platforms that accept LRDIMM modules. It is not compatible with standard desktop computers or with unbuffered or registered ECC memory types.

4Rx4 organisation at CL21

The single specification that decides fit is the 4Rx4 rank configuration combined with CL21 latency at DDR4 2933 (PC4-23400). The motherboard and memory controller must support load-reduced quad-rank modules at this speed and latency. Mixing with unbuffered or registered ECC DIMMs will prevent the system from posting. Backward compatibility with 2133, 2400 and 2666MHz buses is supported when the platform allows down-clocking.

Tool-free press-in installation

Installation requires aligning the notch on the 288-pin edge connector with the slot key and pressing firmly until the retention clips engage. No heat spreader is present, so handle the PCB by its edges to avoid contaminating the gold contacts. The most common error is seating a module in a slot wired for registered or unbuffered memory, which causes a no-post condition. Verify the platform’s qualified vendor list for 4Rx4 LRDIMM support before purchase.

How it compares

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

Price $695.99
Pricier than about 75% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $5.44 per GB
Cheaper than about 69% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2L9D44R4128G
Total capacity128 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

Questions about this item

What does 128GB of DDR4-2933 memory provide inside a server?

It adds 128GB of error-correcting capacity that runs at 2933MHz with CL21 timing, letting the system handle larger workloads and more virtual machines without paging to disk.

How does the PC4-23400 rating affect real-world bandwidth?

PC4-23400 is the JEDEC standard name for DDR4-2933; the module delivers that data rate on any platform that supports the speed, and will also run at 2133, 2400 or 2666MHz if the system requires a lower frequency.

What physical slot and clearance does this 288-pin LRDIMM need?

It fits a standard 288-pin DDR4 DIMM socket; the module has no heat spreader, so it occupies only the nominal board height and works in servers, workstations or NAS systems that accept load-reduced ECC memory.

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