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Name:
D4EC-2666-16G
- Description:
- 16GB RAM UNBUFF ECC ECC DIMM DDR4-2666 260PIN 1.2V
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- Synology
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Extended protection, enterprise-grade.
All enterprise hardware is backed by a 3-year warranty — triple the industry standard — covering defects under normal use.
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If a hardware issue is confirmed, we’ll repair or replace the unit. Replacement parts carry either original or 3-month coverage.
RMA process, simplified.
Once an RMA is approved, return the defective unit within 10 days. We handle the rest — no service gaps.
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Your warranty covers defects under normal use. For continued protection, avoid accidental damage, unauthorized repairs, third-party parts, or extreme environments.
Know your location’s service type.
In some regions, return-to-factory or remote service may apply. On-site service depends on infrastructure availability.
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Changed your mind? Get a refund (restocking fees may apply) or swap with another product.
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Covered for any early faults.
All equipment includes a 30-day replacement warranty. If something goes wrong, we’ll repair or swap it — fast.
Replacements shipped in 10 days or less.
Once your return is inspected and approved, we dispatch the replacement promptly to keep your operations moving.
RMA protocol keeps it smooth.
Just ensure all accessories and original packaging are intact — we’ll take care of the technical validation.
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D4EC-2666-16G Overview
D4EC-2666-16G is a high-performance DDR4 memory module featuring Error-Correcting Code (ECC) support in a standard UDIMM form factor. Operating at a speed of 2666 MHz with a CAS latency of CL19 and a voltage of 1.2V, this 16 GB module is engineered for high reliability in demanding environments.
Designed for server and workstation builds, D4EC-2666-16G is configured as a single-channel kit without a heatsink or RGB lighting, ensuring compatibility with desktop and rack server platforms. Its unbuffered architecture and robust ECC capability make it ideally suited for data centers and professional applications that require trusted memory performance.
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Explore more options from Computer Memory & Ram or explore other Synology products.
D4EC-2666-16G Specifications
| Product Type | Computer Memory |
| Memory Type | DDR4 |
| Capacity | 16 GB |
| Compatible Platforms | Desktop / Server |
| Compatible Systems | Rack Server |
| Form Factor | UDIMM |
| Kit Configuration | Single Channel |
| Speed | 2666 MHz |
| Operating Temperature | N/A |
| Reliability Rating | High Reliability |
| CAS Latency (CL) | CL19 |
| Voltage | 1.2V |
| ECC Support | Yes |
| Registered/Buffered | Unbuffered |
| XMP Support | No |
| RGB Lighting | No |
| Heatsink / Heatspreader | No |
| Intel Platform Support | Intel Xeon Scalable |
| AMD Platform Support | AMD EPYC |
| Use Case | Server |
| Product Name | D4EC-2666-16G DDR4 ECC UDIMM |
| Height | 1.18 inches |
| Width | 5.28 inches |
| Depth | 0.13 inches |
| Weight | 0.15 lbs |
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
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| AMD Platform Support | AMD EPYC | N/A | AMD Ryzen 3000 | N/A | N/A |
| Capacity | 16 GB | 4 GB | 4 GB | 4 GB | 16 GB |
| CAS Latency (CL) | CL19 | CL11 | CL19 | CL19 | CL15 |
| Compatible Platforms | Desktop / Server | Desktop | Desktop / Laptop / Server | Desktop | Desktop |
| Compatible Systems | Rack Server | N/A | Workstation | N/A | N/A |
| Depth | 0.13 inches | 0.5 inches | N/A | 0.3 inches | 0.5 inches |
| ECC Support | Yes | No | No | No | No |
| Form Factor | UDIMM | UDIMM | UDIMM | UDIMM | UDIMM |
| Heatsink / Heatspreader | No | Yes | Yes | Yes | Yes |
| Height | 1.18 inches | 1.2 inches | N/A | 1.4 inches | 1.2 inches |
| Intel Platform Support | Intel Xeon Scalable | N/A | Intel 10th Gen | N/A | N/A |
| Kit Configuration | Single Channel | Single Channel | Single Channel | Single Channel | Single Channel |
| Memory Type | DDR4 | DDR3 | DDR4 | DDR4 | DDR4 |
| Operating Temperature | N/A | N/A | N/A | N/A | N/A |
| Product Name | D4EC-2666-16G DDR4 ECC UDIMM | D3NS1866L-4G | D4NE-2666-4G | D4NESO-2666-4G | RAMRG2133DDR4-16GB |
| Product Type | Computer Memory | Computer Memory | Computer Memory | Computer Memory | Computer Memory |
| Registered/Buffered | Unbuffered | Unbuffered | Unbuffered | Unbuffered | Unbuffered |
| Reliability Rating | High Reliability | Standard | Standard | Standard | Standard |
| RGB Lighting | No | No | No | No | No |
| Speed | 2666 MHz | 1866 MHz | 2666 MHz | 2666 MHz | 2133 MHz |
| Use Case | Server | Gaming / Workstation | General Use | Gaming | Gaming |
| Voltage | 1.2V | 1.35V | 1.2V | 1.2V | 1.2V |
| Weight | 0.15 lbs | 0.25 lbs | N/A | 0.22 lbs | 0.1 lbs |
| Width | 5.28 inches | 5.3 inches | N/A | 5.3 inches | 5.3 inches |
| XMP Support | No | Intel XMP 2.0 | No | Intel XMP 2.0 | Intel XMP 2.0 |
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Questions & Answers
Q
What does SKU D4EC-2666-16G represent?
A
SKU D4EC-2666-16G identifies a 16 GB DDR4-2666 unbuffered ECC UDIMM with 260 pins operating at 1.2 V.
Q
What is ECC in 16 GB DDR4-2666 RAM?
A
ECC (Error-Correcting Code) automatically detects and corrects single-bit memory errors to improve data integrity and system stability.
Q
Is this module unbuffered or registered?
A
This module is unbuffered (UDIMM), meaning it connects directly to the memory controller for lower latency in workstations and servers.
Q
Which motherboards support 16 GB DDR4-2666 ECC UDIMM?
A
Motherboards with DDR4 ECC UDIMM slots and chipset support—typically Intel Xeon or AMD EPYC platforms—are compatible.
Q
How do I install the DDR4-2666 ECC module?
A
Power off the system, align the notch, press the module into the DIMM slot until the latches click, then power on.
Q
What performance benefits does DDR4-2666 provide?
A
DDR4-2666 offers 21 333 MT/s throughput, delivering improved data bandwidth and responsiveness for memory-intensive applications.
Q
Can I mix ECC and non-ECC RAM modules?
A
Mixing ECC and non-ECC modules is not recommended; the system will default to non-ECC mode and lose error-correction features.
Q
What voltage does this DDR4 memory require?
A
This DDR4-2666 ECC UDIMM operates at a standard voltage of 1.2 V for optimized power efficiency and thermal performance.
Q
Will the module run at lower speeds if needed?
A
Yes, it can auto-negotiate to lower JEDEC speeds (e.g., 2133 MT/s) if the motherboard or CPU does not support 2666 MT/s.
Q
What latency timings should I expect?
A
Typical latency for DDR4-2666 ECC UDIMM is CL19-19-19 at 1.2 V, balancing speed and stability in server environments.
Q
Does this ECC DIMM require any BIOS settings?
A
Most platforms auto-detect ECC modules; if necessary, enable ECC support in the BIOS under memory or advanced chipset settings.
Q
How do I verify the module’s ECC functionality?
A
Use system diagnostics tools or BIOS memory tests that report ECC error detection and correction status during POST.
Q
What operating systems support ECC memory?
A
Modern server and workstation OSs—such as Windows Server, Linux distributions, and VMware ESXi—fully support ECC memory.
Q
What warranty covers this 16 GB ECC DIMM?
A
The module is backed by a limited lifetime warranty against defects in materials and workmanship.
Q
How many DIMMs can I install per channel?
A
Most dual- or quad-channel configurations support one or two UDIMMs per channel; consult your motherboard manual for optimal population.
Q
Is heat spreader required for this unbuffered ECC module?
A
No heat spreader is required; this unbuffered ECC UDIMM is designed for standard server airflow and thermal conditions.
