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Two green circuit boards with gold edge connectors and black memory chips, no heat spreaders

OWC

OWC 64GB (2x32GB) DDR4 2666MHz CL19 ECC Registered RDIMM 1.2V 288-pin Server RAM

SKU CH-EYD5-TFF25

Dual-channel kit of two 32 GB DDR4-2666 ECC registered RDIMMs at 1.2 V with CL19 latency for servers and workstations

  • Capacity64GB (2 x 32GB)
  • Type288-Pin DDR4 ECC RDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 64GB (2 x 32GB)

Show 7 more configurations

Rank 2Rx4

  • ECC registered design protects data integrity in servers
  • Dual-channel 64GB kit (2×32GB) doubles memory bandwidth
  • 2666MHz CL19 speed with 1.2V low-power operation
  • Backward compatible with 2133MHz and 2400MHz systems
  • JEDEC and RoHS compliant for warranty-safe upgrades

Server DDR4 ECC Registered Kit

This 64GB kit contains two 32GB DDR4 2666MHz modules built to PC4-21300 specification with CL19 latency. Registered ECC design targets servers, workstations and NAS systems that require error correction and signal buffering. The dual-channel pack operates at 1.2V and conforms to JEDEC standards.

Compatibility Check Required

Verify that your platform supports DDR4 registered ECC RDIMMs before ordering; standard desktop boards and unbuffered memory are not compatible. The modules are backward compatible with 2133MHz and 2400MHz bus speeds. Mixing with unbuffered DIMMs will prevent operation.

Thermals and Power

Modules run at the standard 1.2V DDR4 voltage without a heat spreader, relying on chassis airflow for cooling. Registered buffering adds minimal power draw compared with unbuffered equivalents. Expect quiet operation in typical server or workstation environments with adequate ventilation.

Highlights

  • ECC registered design protects data integrity in servers
  • Dual-channel 64GB kit (2×32GB) doubles memory bandwidth
  • 2666MHz CL19 speed with 1.2V low-power operation
  • Backward compatible with 2133MHz and 2400MHz systems
  • JEDEC and RoHS compliant for warranty-safe upgrades

Specifications

BrandOWC
Part Number2R6D42R4064P
Capacity64GB (2 x 32GB)
Type288-Pin DDR4 ECC RDIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Multi-channel KitDual Channel Kit
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 the kit include anything beyond the two 32GB modules, or do I need to buy heatsinks or cables separately?

The package contains only the two 32GB DDR4 2666MHz CL19 ECC Registered RDIMMs; no heat spreaders, cables or extra accessories are included.

Why choose this 64GB dual-channel kit instead of a single 64GB module or a lower-capacity kit?

The matched 2x32GB kit runs in dual-channel mode for maximum bandwidth, while a single 64GB stick would run single-channel and lower-capacity kits would not reach 64GB total.

What does the 2666MHz rating mean once the RAM is installed in a server that officially supports 2400MHz?

The modules will automatically down-clock to 2400MHz (or 2133MHz) while keeping CL19 timings and 1.2V operation, so they work without manual BIOS changes.

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