Synology DDR4 - module - 8 GB - DIMM 288-PIN

When a NAS or server demands uncompromising data integrity, generic desktop memory simply will not do. The Synology D4EC-2666-8G-BULK is a purpose-built 8 GB DDR4 ECC UDIMM that combines error-correcting code protection with Synology's strict validation for select DiskStation and RackStation models. Unlike ordinary unbuffered modules, this 288-pin DIMM runs at 2666 MHz with CL19 latency and a single-rank x8 layout, delivering stable performance under continuous workloads. On-die termination and a 1.2 V operating voltage keep signal quality high and power draw low, while the 0 °C to 85 °C operating range ensures reliability in varied environments. Backed by Synology's limited warranty, this module is a straightforward way to expand memory without risking compatibility or data corruption.

Highlights

• 8 GB DDR4 SDRAM with ECC for automatic detection and correction of memory errors
• 288-pin UDIMM form factor, specifically validated for select Synology NAS and servers
• 2666 MHz clock speed (PC4-21300) with CL19 latency for responsive multitasking
• 1.2 V low-voltage operation reduces heat and energy consumption
• Single-rank x8 organization and on-die termination for improved signal integrity
• RoHS compliant and backed by Synology's manufacturer limited warranty

In daily use

Install the D4EC-2666-8G-BULK in a compatible Synology unit and the system immediately recognizes the additional capacity. ECC technology works silently in the background, correcting single-bit errors and detecting multi-bit faults that could otherwise corrupt cached data or cause unexpected reboots. For small businesses running file sharing, surveillance, or virtualization, this means fewer interruptions and stronger data protection. The module's 0 °C to 85 °C operating range suits both climate-controlled server rooms and warmer network closets, and its low 1.2 V draw helps keep overall system power consumption in check. Whether upgrading a single workstation-class NAS or populating multiple slots in a rackmount server, the module's consistent timings and Synology validation simplify deployment.

Full specifications

• Brand: Synology
• Model: D4EC-2666-8G-BULK
• Memory type: DDR4 SDRAM
• Capacity: 8 GB
• Module type: UDIMM (Unbuffered DIMM)
• Form factor: DIMM 288-pin
• Speed: 2666 MHz
• Data transfer rate: PC4-21300
• Error correction: ECC
• Latency: CL19
• Voltage: 1.2 V
• Rank: 1Rx8 (Single Rank x8)
• Features: On-Die Termination (ODT)
• Operating temperature: 0 °C to 85 °C
• Storage temperature: -55 °C to 100 °C
• Compliance: RoHS
• Warranty: Manufacturer's Limited Warranty

Final note

For Synology users who refuse to compromise on data integrity, the D4EC-2666-8G-BULK is the memory upgrade that matches the platform's reliability standards — no guesswork, no compatibility surprises.