Crucial CT16G4WFD8266
Expert rating7.8 / 10
- DDR Generation:
- DDR4
- Capacity:
- 16GB
- Speed:
- 2666MT/s
- CAS Latency:
- CL19
- ECC:
- Yes
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Manufacturer: Crucial Last updated: 2026-09-12T18:05:04.000Z
Crucial CT16G4WFD8266 (16GB/DDR4 2666MHz/CL19/2Rx8/1.2V/ECC Unbuffered UDIMM/288-Pin) Review
Crucial CT16G4WFD8266 is a 16GB DDR4-2666 ECC unbuffered UDIMM (2Rx8, 1.2V) built for entry workstations and small servers, giving Crucial's Micron-die reliability with on-module error correction at a mainstream 2666MHz JEDEC speed.
This is the ECC stick to reach for on an entry Xeon or Ryzen PRO workstation running CAD, engineering simulation, or a small database — error correction without needing to step up to pricier registered server memory.
ECC for Entry Workstations, Not Just Servers
Unbuffered ECC UDIMMs like this one work in many workstation-class motherboards (Xeon E-series, Ryzen PRO/Threadripper PRO with ECC support) without needing a full server chassis or registered RDIMM support.
Comparison to Alternatives
Against the Kingston ValueRAM KVR26E19D8/16 (identical 16GB/2666MHz/CL19 ECC UDIMM spec), the two are near-direct competitors — pick whichever brand's pricing or availability is better for your build. Compared with the Micron (Crucial) MTA9ASF2G72AZ-3G2B1R (16GB DDR4-3200 ECC UDIMM) already in the catalog, that part suits boards supporting the faster 3200MHz standard, while this CT16G4WFD8266 matches the very common 2666MHz-capped Xeon E-2100/E-2200 generation.
Specifications
Identity
| Brand | Crucial |
|---|---|
| Part Number | CT16G4WFD8266 |
| Series | Crucial Workstation ECC |
Memory
| DDR Generation | DDR4 |
|---|---|
| Capacity | 16 GB |
| Speed | 2666MT/s (PC4-21300) |
| CAS Latency | 19 |
| Module Count | 1 |
| Voltage | 1.2 V |
Physical
| Form Factor | 288-Pin ECC UDIMM (Server/Workstation) |
|---|---|
| RGB Lighting | No |
Module and platform
| RAM Segment | Server |
|---|
Capacity
| Capacity Per Module | 16 GB |
|---|---|
| Module Count | 1 |
Speed and timings
| True Latency | 14.3 ns |
|---|
Silicon
| Memory IC | Micron |
|---|
Physical and lighting
| Colour | Green PCB |
|---|
Commercial
| Warranty | Limited Lifetime |
|---|
| Model Number | CT16G4WFD8266 |
|---|---|
| Spec Score | 1.8 |
Expert Review
Reviewed by Burooj Alam. Rated by us, not by users.
Expert rating7.8 / 10
A reliable, mainstream-speed ECC UDIMM for entry workstations that don't need registered server memory.
Best for
- Entry Xeon E-series and Ryzen PRO workstations
- CAD and simulation workloads needing ECC
- Small-business servers on 2666MHz-capable boards
Not for
- 3200MHz-capable modern server platforms
- Registered/buffered RDIMM requirements
- Consumer gaming desktops
FAQs
What are the key specifications of the Crucial CT16G4WFD8266 (16GB/DDR4 2666MHz/CL19/2Rx8/1.2V/ECC Unbuffered UDIMM/288-Pin)?
The Crucial CT16G4WFD8266 (16GB/DDR4 2666MHz/CL19/2Rx8/1.2V/ECC Unbuffered UDIMM/288-Pin) is a memory kit from Crucial. Key specs: DDR Generation DDR4, Capacity 16GB, Kit Configuration 1 x 16GB, Speed 2666MT/s (PC4-21300), CAS Latency 19.
Will the Crucial CT16G4WFD8266 (16GB/DDR4 2666MHz/CL19/2Rx8/1.2V/ECC Unbuffered UDIMM/288-Pin) work with my current setup?
The Crucial CT16G4WFD8266 (16GB/DDR4 2666MHz/CL19/2Rx8/1.2V/ECC Unbuffered UDIMM/288-Pin) lists DDR Generation is DDR4. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits. Our upgrade checker at /upgrade can confirm compatibility for common combinations.
Who is the Crucial CT16G4WFD8266 (16GB/DDR4 2666MHz/CL19/2Rx8/1.2V/ECC Unbuffered UDIMM/288-Pin) best suited to?
It suits entry xeon e-series and ryzen pro workstations, cad and simulation workloads needing ecc, small-business servers on 2666mhz-capable boards.
What are the drawbacks of the Crucial CT16G4WFD8266 (16GB/DDR4 2666MHz/CL19/2Rx8/1.2V/ECC Unbuffered UDIMM/288-Pin)?
It is a poor fit for 3200mhz-capable modern server platforms, registered/buffered rdimm requirements, consumer gaming desktops.