Synology FlashStation FS6420 | 24-Bay 2U All-Flash Rackmount Storage Solution

The Synology FlashStation FS6420 is a high-performance 2U 24-bay all-flash rackmount NAS engineered for ultra-low latency, intensive I/O workloads, and virtualization. Powered by Synology DiskStation Manager (DSM), it delivers extreme throughput, enterprise-grade data management, and redundant reliability for mission-critical business environments.

Engineered for Enterprise Workload Continuity:

  • High-Performance Hardware: 16-core AMD EPYC 7303 processor with 64GB DDR4 ECC RDIMM (expandable up to 1,024GB).
  • All-Flash Storage: 24 native 2.5″ SATA SSD bays providing fast, low-latency data access.
  • High-Speed Connectivity: Built-in dual 10GbE RJ-45 ports and dual PCIe Gen 4 x16 expansion slots for 10/25GbE or Fibre Channel upgrades.
SKU FS6420 Categories , ,
CPU
CPU Model AMD EPYC 7303
CPU Quantity 1
CPU Cores 16
CPU Threads 32
CPU Architecture 64-bit
CPU Frequency 2.4 (base) / 3.4 (turbo) GHz
Hardware Encryption Engine
Memory
System Memory 64 GB DDR4 ECC RDIMM
Memory Module Pre-installed 64 GB (64 GB × 1)
Total Memory Slots 16
Maximum Memory Capacity 1024 GB (64 GB × 16)
Notes
  • Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and performance.
  • 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 multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
Storage
Drive Bays (See all supported drives)
24 × 2.5″ SATA SSD
Hot Swappable Drive*
Notes
  • Compatible drives are mandatory. Please consult our compatibility list before purchasing hard drives. For more details, please refer to this article.
  • SSD cache can be enabled with select compatible SSD. See the compatibility list for model-specific support and details. SSDs are sold separately.
External Ports
RJ-45 10GbE LAN Port 2
Out-of-Band Management LAN Port 1
USB 3.2 Gen 1 Port 2
PCIe
PCIe Expansion 2 × Gen4 x16 slot (x16 link)
Appearance
Form Factor (RU) 2U
Size (Height × Width × Depth) 88 mm × 482 mm × 724 mm
Weight 15.5 kg
Rack Installation Support* 4-post 19″ rack (Synology Rail Kit – RKS-02)
Notes The rail kit is sold separately
Others
System Fan 80 mm × 80 mm × 4 pcs
Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Easy Replacement System Fan
Power Recovery
Noise Level 53.0 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter 550 watts
Redundant Power Supply
AC Input Power Voltage 100V to 240V AC
Power Frequency 50/60 Hz, Single Phase
Power Consumption 164.74 watts (Access)
British Thermal Unit 561.76 BTU/hr (Access)
Notes
  • For more information on how power consumption is measured, refer to this article.
  • Noise testing was conducted with the Synology system fully installed with Synology SATA SSDs and in an idle state. Two G.R.A.S. type 40AE microphones were placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%.
Temperature
Operating Temperature 0°C to 35°C (32°F to 95°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F)
Operating Humidity 8% to 80% RH
Storage Humidity 5% to 95% RH
Certification
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • UKCA
  • EAC
  • CCC
  • KC
  • BIS
  • UL
Warranty
5 Years
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment
RoHS Compliant
Packaging Content
  • Main Unit × 1
  • Accessory Pack × 1
  • C13 to C14 power cord × 2
  • Front Cover × 1