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Green rectangular circuit board with gold edge contacts and black memory chips, no heat spreader

OWC

OWC 128GB DDR4 2666 CL19 8Rx4 288-pin 1.2V ECC Registered RDIMM server RAM

SKU CH-1789-KPRAE

A single 128GB DDR4 2666 CL19 8Rx4 288-pin 1.2V ECC Registered RDIMM for servers, workstations and NAS systems

  • Total capacity128 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latency19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4
  • 128GB single-module capacity simplifies server upgrades
  • ECC registered design protects data integrity in critical workloads
  • 2666MHz DDR4 speed with CL19 latency balances throughput and response
  • 2V operation reduces power draw in dense configurations
  • JEDEC and RoHS compliant for warranty-safe deployment

Server-grade ECC RDIMM for workstations

This 128 GB DDR4-2666 module is built for servers, workstations and NAS systems that require registered ECC memory. It operates at PC4-21300 with a CAS latency of 19 and runs at the standard 1.2 V. The single DIMM delivers high density in one slot, making it suitable for memory-intensive workloads on compatible platforms.

Registered design with JEDEC compliance

The 288-pin RDIMM uses an 8Rx4 organisation and includes no heat spreader, keeping the profile low for dense server chassis. JEDEC and RoHS compliance ensures a warranty-safe upgrade that meets OEM specifications. Backward compatibility with 2133 MHz and 2400 MHz systems allows the module to clock down automatically when installed in slower platforms.

Replaces lower-capacity registered DIMMs

The upgrade is worthwhile when a system supports 128 GB registered modules and the workload benefits from fewer occupied slots. It cannot be used in standard desktop computers or mixed with unbuffered or load-reduced ECC memory. Buyers needing unbuffered DIMMs or higher-speed registered kits should look elsewhere.

How it compares

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

Price $681.99
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).
CAS latency 19
Lower than about 91% of the 439 comparable items (median 40).
Price per GB $5.33 per GB
Cheaper than about 70% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2R6D48R4128G
Total capacity128 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latency19
ECC supportYes
Buffer typeRegistered
Memory rank8Rx4
Heat spreaderNo
Power
Rated voltage1.2 V

Questions about this item

Does DDR4 2666 PC4-21300 limit the memory bus to 2666 MT/s?

Yes, the module runs at 2666 MT/s and will down-clock to 2133 or 2400 if the platform requires it.

What slot and clearance does the 288-pin 8Rx4 RDIMM need?

It fits a standard DDR4 288-pin RDIMM slot; no heat spreader means low-profile clearance is sufficient.

How is the ECC Registered DIMM installed and what step is often missed?

Align the notch, press firmly until the retention clips click, then verify the system registers the full 128 GB and ECC mode in BIOS.

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