Lightning speed with lower TCO

Featuring an 8-core CPU and 16GB ECC RDIMM memory, FS3400 provides more than 137,000 4K random write IOPS, meeting the needs for real-time analytics, online transaction processing, and mission-critical database services.۱ With built-in 10GbE Ethernet, PCIe expansion, and the support of various SAS and SATA drives, FS3400 delivers flexible and economical all-flash server deployment on demand.


Up to 72 x SAS/SATA drives۲


۱ x PCIe 3.0 for 25/40GbE NIC’s expansion


۱۶GB DDR4 ECC RDIMM, up to 128GB


Intel® Xeon® D-1541 8 Core 2.1 GHz

CPU Model Intel Xeon D-1541
  CPU Quantity ۱
  CPU Architecture ۶۴-bit
  CPU Frequency ۸-core 2.1 (base) / 2.7 (turbo) GHz
  Hardware Encryption Engine (AES-NI)  
System Memory ۱۶ GB DDR4 ECC RDIMM
  Memory Module Pre-installed ۱۶ GB (16 GB x 1)
  Total Memory Slots ۴
  Maximum Memory Capacity ۱۲۸ GB (32 GB x 4)
  • For more information on memory upgrade limitations, visit here.
  • Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.
  • For more information on the recommended memory configurations, visit here.
  • Synology reserves the right to replace memory modules with the same or higher frequency based on supplier’s product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
Drive Bays ۲۴
  Maximum Drive Bays with Expansion Unit ۴۸ (RX1217sas x 2) / 72 (FX2421* x 2)
  Compatible Drive Type* (See all supported drives)
  • ۲.۵″ SAS HDD
  • ۲.۵″ SAS SSD
  • ۲.۵″ SATA SSD
  Hot Swappable Drive  
  Notes “Compatible drive type” indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
External Ports
RJ-45 1GbE LAN Port ۴ (with Link Aggregation / Failover support)
  RJ-45 10GbE LAN Port ۲ (with Link Aggregation / Failover support)
  USB 3.2 Gen 1 Port* ۲
  Expansion Port ۱
  Notes The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.
PCIe Expansion ۱ x Gen3 x8 slot (x8 link)
File System
Internal Drives
  • Btrfs
  • EXT4
  External Drives
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT
  Notes exFAT Access can be installed for free from Package Center in DSM 7.0. In DSM 6.2 or earlier versions, exFAT Access needs to be purchased in Package Center.
Form Factor (RU) ۲U
  Size (Height x Width x Depth) ۸۸ mm x 482 mm x 724 mm
  Weight ۱۴.۹ kg
  Rack Installation Support* ۴-post 19″ rack (Synology Rail Kit – RKS-02)
  Notes The rail kit is sold separately
System Fan ۸۰ mm x 80 mm x 4 pcs
  Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
  Easy Replacement System Fan  
  Power Recovery  
  Noise Level* ۵۷ dB(A)
  Scheduled Power On / Off  
  Wake on LAN / WAN  
  Power Supply Unit / Adapter ۵۰۰ W
  Redundant Power Supply  
  AC Input Power Voltage ۱۰۰V to 240V AC
  Power Frequency ۵۰/۶۰ Hz, Single Phase
  Power Consumption* ۳۱۳.۸۴ W (Access)
۱۲۵.۷۷ W (HDD Hibernation)
  British Thermal Unit ۱,۰۷۰.۸۶ BTU/hr (Access)
۴۲۹.۱۵ BTU/hr (HDD Hibernation)
  • Power consumption is measured when it is fully loaded with HGST 1.8TB HUC101818CS4204 hard drive(s).
  • Noise Level Testing Environment: Fully loaded with Toshiba 600GB AL14SEB060N hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
Operating Temperature ۰°C to 35°C (32°F to 95°F)
  Storage Temperature -۲۰°C to 60°C (-5°F to 140°F)
  Relative Humidity ۵% to 95% RH
  • FCC
  • CE
  • BSMI
  • EAC
  • KC
  • UL
  • VCCI
  • RCM
۵ Years
  Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
RoHS Compliant
Packaging Content
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Cord X 2
  • Quick Installation Guide X 1
Optional Accessories
  • It is required to use D4RD-2666-16G with identical memory modules of the same capacity and frequency. For more information, visit here.
  • Expansion Unit FX2421 can only be used with identical expansion units.


Synology Assistant


Operating System(DSM)


Hardware Installation Guide




FlashStation FS3400


۱۳-Expansion port

۱۴-Reset button

۹-۱GbE RJ-45 port

۱۰-۱۰GbE RJ-45 port

۱۱-USB 3.0 port

۱۲-PCIe expansion slot

۵-Power port

۶-PSU indicator

۷-PSU fan

۸-Console port

۱-Power button and indicator

۲-Beep off button

۳-Drive status indicator

۴-Drive tray