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Green rectangular circuit board with gold edge connectors and black memory chips

OWC

OWC 2R6D41R408GB 8GB DDR4 2666 CL19 1Rx4 ECC RDIMM 1.2V 288-pin server RAM

SKU CH-QKVY-2WC64

8GB DDR4 2666 ECC registered RDIMM for servers, workstations and NAS, CL19 1.2V, backward compatible with 2133 and 2400MHz

  • Total capacity8 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank1Rx4

Capacity 8GB

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Rank 1Rx4

  • ECC protection prevents data corruption in servers
  • Registered design stabilises heavy multi-module loads
  • DDR4 2666 speed matches PC4-21300 bandwidth
  • Low 1.2V voltage cuts power draw
  • Backward compatible with 2133 and 2400 systems

Server-grade ECC registered DIMM

This 8 GB DDR4 module runs at 2666 MHz with CL19 latency and 1.2 V power. It is built as a 1Rx4 registered DIMM with error-correcting code for data integrity. The part targets servers, workstations and NAS systems that require registered memory. It will not work in standard desktop boards or alongside unbuffered modules.

JEDEC-compliant 288-pin DDR4

Operation stays within the 1.2 V JEDEC specification, so power draw and heat remain at standard DDR4 levels. No heat spreader is fitted, relying on case airflow for cooling. Backward compatibility with 2133 MHz and 2400 MHz systems allows the module to clock down automatically when installed in slower platforms.

Single-module 8 GB upgrade

The stick uses a 288-pin RDIMM form factor and carries the OWC part number 2R6D41R408GB. Registered buffering adds one clock cycle of latency but enables larger memory populations per channel. Buyers needing unbuffered ECC or non-ECC memory for consumer boards cannot use this module.

How it compares

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

Price $71.99
Cheaper than about 77% of the 6,523 comparable items (median $188.99).
Total capacity 8 GB
Lower than about 80% of the 6,064 comparable items (median 32 GB).
Price per GB $9.00 per GB
Pricier than about 63% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2R6D41R408 GB
Total capacity8 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank1Rx4
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

Questions about this item

How do I install this 288-pin DDR4 RDIMM and what step is often missed?

Align the notch on the module with the slot key, press firmly until both retention clips click, then verify the system registers the full 8GB capacity at 2666MHz.

What maintenance or replacement will this ECC RDIMM need over time?

No routine maintenance is required; the module has no heat spreader and operates at 1.2V, so replacement is only needed if a memory error occurs or capacity must increase.

What limit appears first when this CL19 1Rx4 module runs under sustained load?

The CAS latency of 19 cycles at 2666MHz sets the timing floor, and the single-rank 1Rx4 organisation caps maximum bandwidth before thermal or voltage limits are reached.

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