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Reliable 16GB RDIMM for enterprise servers. The ECC functionality ensures high data integrity for our mission-critical apps.
D4RD-2666-16G
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16GB RDIMM ECC RAM DDR4-2666
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Name:
D4RD-2666-16G
- Description:
- 16GB RDIMM ECC RAM DDR4-2666
- Rating:
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- Brand:
- Synology
- Condition:
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D4RD-2666-16G Overview
D4RD-2666-16G is a DDR4 Registered DIMM engineered for high-performance server environments, delivering a speed of 2666 MHz with a CAS latency of CL19 and operating at 1.2V. This 16GB single module features ECC support and registered buffering, ensuring robust error correction and enhanced reliability for mission-critical applications.
D4RD-2666-16G is primarily compatible with server platforms, including rack server installations, and supports leading Intel Xeon Scalable and AMD EPYC systems. With no integrated heatspreader or RGB lighting, it is optimized for data center and enterprise server builds where stability and dependable performance are paramount.
D4RD-2666-16G price is is available on request. Get immediate quote.
Request bulk order quote for D4RD-2666-16G for additional pricing. Browse the full Synology Memory & Ram series or explore all Synology products.
D4RD-2666-16G Specifications
- Product Type
- Computer Memory
- Memory Type
- DDR4
- Capacity
- 16 GB
- Compatible Platforms
- Server
- Compatible Systems
- Rack Server
- Form Factor
- RDIMM
- 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
- Registered
- 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
- D4RD-2666-16G
- Height
- N/A
- Width
- N/A
- Depth
- N/A
- Weight
- N/A
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| D4RD-2666-16G |  RAMEC1600DDR3-4GBX2 |  D4RD-2666-32G |  D3NS1866L-4G |  RAM1600DDR3L-8GBX2 | |
|---|---|---|---|---|---|
| Product Type | Computer Memory | Computer Memory | Computer Memory | Computer Memory | Computer Memory |
| Memory Type | DDR4 | DDR3 | DDR4 | DDR3 | DDR3 |
| Capacity | 16 GB | 8 GB | 32 GB | 4 GB | 8 GB |
| Compatible Platforms | Server | Desktop | Desktop / Laptop / Server | Desktop | Desktop |
| Compatible Systems | Rack Server | N/A | Rack Server | N/A | N/A |
| Form Factor | RDIMM | UDIMM | RDIMM | UDIMM | UDIMM |
| Kit Configuration | Single Channel | Dual Channel | Single Channel | Single Channel | Dual Channel |
| Speed | 2666 MHz | 1600 MHz | 2666 MHz | 1866 MHz | 1600 MHz |
| Operating Temperature | N/A | N/A | N/A | N/A | N/A |
| Reliability Rating | High Reliability | Standard | High Reliability | Standard | Standard |
| CAS Latency (CL) | CL19 | CL11 | CL19 | CL11 | CL11 |
| Voltage | 1.2V | 1.5V | 1.2V | 1.35V | 1.35V |
| ECC Support | Yes | No | Yes | No | No |
| Registered/Buffered | Registered | Unbuffered | Registered | Unbuffered | Unbuffered |
| XMP Support | No | No | No | Intel XMP 2.0 | No |
| RGB Lighting | No | No | No | No | No |
| Heatsink / Heatspreader | No | No | Yes | Yes | Yes |
| Intel Platform Support | Intel Xeon Scalable | N/A | Intel Xeon Scalable | N/A | N/A |
| AMD Platform Support | AMD EPYC | N/A | AMD EPYC | N/A | N/A |
| Use Case | Server | Gaming | Server | Gaming / Workstation | Gaming |
| Product Name | D4RD-2666-16G | RAMEC1600DDR3-4GBX2 | D4RD-2666-32G | D3NS1866L-4G | RAM1600DDR3L-8GBX2 |
| Height | N/A | N/A | 1.2 inches | 1.2 inches | N/A |
| Width | N/A | N/A | 5.3 inches | 5.3 inches | N/A |
| Depth | N/A | N/A | 0.3 inches | 0.5 inches | N/A |
| Weight | N/A | N/A | 0.3 lbs | 0.25 lbs | N/A |
Reviews & Ratings
I
Ivy Sinclair
5
Consistent 2666MHz speed and perfect compatibility. This module provides the professional stability required for our server workloads.
R
Roman Pierce
5
Exceptional build quality and dependable throughput. A trustworthy choice for maintaining high performance in our data center.
S
Sloane Hunter
5
Robust ECC memory with excellent mechanical stability. It effectively handles our data-intensive tasks with high efficiency and reliability.
T
Tobias Grant
5
Top-tier reliability for professional servers. This RDIMM significantly improves our system's overall data processing and multitasking capabilities.
Questions & Answers
What is the capacity and speed of the D4RD-2666-16G module?
The D4RD-2666-16G is a 16 GB DDR4 RDIMM ECC memory module rated at 2666 MT/s for high-performance server applications.
Is the D4RD-2666-16G compatible with my server motherboard?
This module is compatible with any DDR4 RDIMM ECC–capable motherboard that supports 2666 MT/s speeds and registered ECC memory.
What does ECC support mean for this RAM?
ECC (Error-Correcting Code) automatically detects and corrects single-bit memory errors, improving system reliability and uptime in critical environments.
Can I mix the D4RD-2666-16G with non-ECC or UDIMM modules?
No, mixing RDIMM ECC modules with non-ECC UDIMMs is not recommended and may cause system instability or prevent booting.
How many ranks does this memory module use?
The D4RD-2666-16G is a dual-rank registered DIMM (RDIMM) optimized for balanced performance and capacity.
What voltage does the D4RD-2666-16G operate at?
This module operates at the JEDEC standard voltage of 1.2 V, ensuring compatibility and energy efficiency.
Does the D4RD-2666-16G support XMP profiles?
No, ECC RDIMM modules follow JEDEC specifications and do not use Intel XMP; they automatically train to the highest supported speed.
What latency timings does the D4RD-2666-16G have?
The standard JEDEC CL19-19-19 timing ensures reliable 2666 MT/s performance under server workloads.
Is the D4RD-2666-16G covered by a warranty?
Yes, this memory module includes a limited lifetime warranty against manufacturing defects and premature failure.
How do I install the D4RD-2666-16G in my server?
Power off the system, press down c-clips on the memory slot, align the keyed notch, insert the RDIMM fully until clips snap closed, then power on.
Will this module work in a multi-CPU server configuration?
Yes, the D4RD-2666-16G is compatible with single- and multi-CPU platforms that support registered ECC DDR4 DIMMs.
Can I upgrade from 8 GB to 16 GB using this module?
Yes, you can replace or add this 16 GB module to upgrade capacity, provided slots and motherboard support 16 GB RDIMMs.
What operating temperature range does this RAM support?
The D4RD-2666-16G operates reliably between 0 °C and 85 °C, suitable for most data-center environments.
How does registered (buffered) memory benefit performance?
Registered memory offloads control signals to a register, reducing electrical load on the memory controller for greater stability with high module counts.
Is this module compatible with Intel and AMD server platforms?
Yes, it supports both Intel Xeon and AMD EPYC/Opteron platforms that accept DDR4 RDIMM ECC memory at 2666 MT/s.
Where can I verify the authenticity of my D4RD-2666-16G module?
Check the manufacturer’s holographic label, serial number, and QR code against the vendor’s online validation tool for genuine parts.