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Green circuit board with black memory chips and gold edge connectors

OWC

OWC 64GB DDR4 2666MHz PC4-21300 CL19 2Rx4 ECC Registered RDIMM 1.2V 288-pin Server RAM

SKU CH-A6FB-YVJEC

A 64GB DDR4 2666MHz ECC registered RDIMM for servers, workstations and NAS systems, CL19 1.2V 288-pin with 2Rx4 organisation

  • Capacity64GB
  • Type288-Pin DDR4 ECC RDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 64GB

Show 7 more configurations

Rank 2Rx4

  • 64GB capacity expands server memory headroom
  • ECC registered design protects data integrity in critical workloads
  • DDR4 2666MHz speed delivers responsive performance for demanding applications
  • 2V operation reduces power draw and thermal load
  • Backward compatible with 2133MHz and 2400MHz systems for flexible deployment

64GB DDR4 ECC Registered RDIMM

This 64GB DDR4 2666MHz PC4-21300 CL19 2Rx4 ECC Registered RDIMM operates at 1.2V on a 288-pin interface. It is built for servers, workstations and NAS systems that require registered memory with error correction.

Workstations and servers needing registered ECC

Suitable for systems that specifically require registered ECC DDR4 modules and can accept 2Rx4 density. Not for standard desktop computers or laptops that use unbuffered non-ECC memory, nor for platforms that cannot address 64GB per slot or that forbid mixing registered with unbuffered modules.

Single-module 64GB capacity at 2666MHz

Provides 64GB in one slot running at 2666MHz with CL19 latency and backward compatibility to 2133MHz and 2400MHz speeds. Headroom scales with the number of registered DIMM slots your platform supports; maximum capacity is limited by the motherboard and CPU memory-controller limits.

Highlights

  • 64GB capacity expands server memory headroom
  • ECC registered design protects data integrity in critical workloads
  • DDR4 2666MHz speed delivers responsive performance for demanding applications
  • 2V operation reduces power draw and thermal load
  • Backward compatible with 2133MHz and 2400MHz systems for flexible deployment

Specifications

BrandOWC
Part Number2R6D42R464GB
Capacity64GB
Type288-Pin DDR4 ECC RDIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo

Other versions of this model

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Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

Does my server motherboard need to support 288-pin DDR4 ECC Registered RDIMMs for this 64GB module to work?

Yes — this module is a 288-pin DDR4 ECC Registered RDIMM running at 2666MHz (PC4-21300) with CL19 latency and 1.2V operation; the motherboard must accept registered ECC DDR4 in that form factor.

Will this 2666MHz CL19 2Rx4 module run correctly alongside my existing 2133MHz or 2400MHz DDR4 ECC Registered DIMMs?

The module is backward compatible with 2133MHz and 2400MHz speeds; when mixed, all DIMMs will operate at the lowest common speed and the system must use registered ECC DDR4 throughout.

How can I verify the module is detected at its full 64GB capacity and 2666MHz speed after installation?

Check the system BIOS or UEFI memory information screen — it should show a single 64GB DDR4 module running at 2666MHz (PC4-21300) with CL19 timings and registered ECC status.

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