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Two black DDR4 UDIMM sticks without heat spreaders, 288 pins each

OWC

OWC 64GB (2x32GB) DDR4 2666MHz CL19 ECC Unbuffered UDIMM desktop RAM

SKU CH-3ZZ9-0QTQ2

Dual-channel kit provides 64GB of DDR4 2666MHz ECC unbuffered memory with CL19 latency at 1.2V for workstations and servers

  • Total capacity64 GB (2 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Kit configurationDual Channel Kit

Capacity 64GB (2 x 32GB)

  • 64 GB total capacity from two 32 GB modules for large workloads
  • DDR4 2666 MHz CL19 speed rating for responsive data access
  • ECC unbuffered design detects and corrects single-bit errors automatically
  • 2 V operation reduces power draw and heat output
  • Backward compatible with 2400 MHz and 2133 MHz systems

OWC 64GB DDR4 2666 ECC UDIMM Kit

This OWC kit provides 64GB of DDR4 2666MHz memory in a matched pair of 32GB modules. It is built as unbuffered ECC UDIMMs that run at 1.2V with CL19 latency. The modules target workstations, servers and NAS systems that require error-correcting memory for data integrity.

Who Should Buy This Kit

Choose this kit when your motherboard supports unbuffered ECC DDR4 and you need 64GB of capacity for ECC workloads. Avoid it if your platform only accepts non-ECC memory or requires registered DIMMs, because those configurations will not work with these modules.

The Deciding Specification

The unbuffered ECC design is the single specification that determines compatibility. Your system must explicitly support unbuffered ECC DDR4 UDIMMs; registered or non-ECC boards will not accept this memory.

How it compares

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

Price $489.99
Pricier than about 85% of the 3,647 comparable items (median $90.99).
Total capacity 64 GB (2 × 32 GB)
Higher than about 90% of the 3,251 comparable items (median 16 GB).
Price per GB $7.66 per GB
Pricier than about 56% of the 3,251 comparable items (median $6.75 per GB).

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Specifications

Product
Brand nameOWC
Part number2E6D42R8064P
Total capacity64 GB (2 × 32 GB)
Product colorBlack
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Recommended forWorkstations, Servers, and NAS Systems
More details
LED lightingNone

Other versions of this model

5 more in the same range

Questions about this item

Should I pick the 2x32GB kit or look for a single 64GB module?

This kit provides 64GB total across two 32GB modules, enabling dual-channel operation on compatible motherboards. A single 64GB DIMM would run in single-channel mode and may not be available in unbuffered ECC form.

What does the 2666MHz rating deliver in an actual workstation?

The modules run at 2666MHz (PC4-21300) with CL19 latency at 1.2V. In a real system they will operate at the highest speed the CPU and chipset support, down-clocking automatically to 2400MHz or 2133MHz if required.

Is the 288-pin DDR4 interface limited to 2666MHz on this kit?

The DDR4 288-pin interface itself supports higher speeds, but these specific modules are rated for 2666MHz. They will not exceed that frequency; the motherboard simply runs them at their rated 2666MHz or a lower supported speed.

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