Synology · FS series
Synology FS6400
The Synology FS6400 is a 24-bay all-flash rackmount NAS built around two Intel Xeon Silver 4110 processors. Installed memory is 32 GB DDR4 ECC RDIMM, expandable to 512 GB. Networking is 2 x 1GbE RJ-45, 2 x 10GbE RJ-45. With expansion units it grows to 72 drive bays.
- Drive bays
- 24
- Processor
- Dual Intel Xeon Silver 4110
- Memory
- 32 GB DDR4 ECC RDIMM
- Network
- 10GbE
Who it suits
All-flash storage suits work that needs fast response: virtual machines, databases and video editing. It costs more per terabyte than hard drives, so it is usually paired with a larger hard-drive NAS for backup and archive.
Synology FS6400 specifications
| Processor | 2 x Intel Xeon Silver 4110, 8-core, 2.1 GHz (burst 3.0 GHz) |
|---|---|
| Memory installed | 32 GB DDR4 ECC RDIMM |
| Maximum memory | 512 GB |
| Drive bays | 24 x 2.5" SAS HDD/SSD or SATA SSD |
| Maximum bays with expansion | 72 |
| Network ports | 2 x 1GbE RJ-45, 2 x 10GbE RJ-45 |
| USB ports | 2 x USB 3.2 Gen 1 |
| Expansion slots | 2 x Gen3 x8 slots (x8 link) |
| HDMI | none |
| Form factor | Rackmount 2U |
| Size (H × W × D) | 88 x 482 x 724 mm |
| Weight | 17.26 kg |
| Power consumption | 288.49 W access / 145.8 W HDD hibernation |
| Noise level | 53.7 dB(A) |
| Power supply | 800 W |
| Warranty | 5 years |
Specifications from Synology's published data, checked October 2026. See the FS6400 on Synology's website. Confirm details before ordering.
Usable capacity by RAID level
How much space the FS6400 gives with typical drive sizes.
| RAID level | 24 × 1 TB | 24 × 2 TB | 24 × 4 TB | 24 × 8 TB |
|---|---|---|---|---|
| RAID 6 | 22 TB | 44 TB | 88 TB | 176 TB |
Space is shown before formatting; expect about 10% less in use. Larger systems are often split into more than one RAID group.
What we do with it
- Storage
NAS supply and installation
A right-sized Synology, QNAP or Asustor unit with the drives, RAID level and network setup your office needs.
- Backup
Automatic backup setup
Scheduled backups of PCs, servers and shared folders to the NAS, with an off-site copy, so nobody has to remember to do it.
- Versions
Ransomware protection for NAS
Point-in-time snapshots and protected copies that let you roll a folder back to how it was before an attack or a mistake.
- Move
Data migration
We move your files, users and permissions from old servers, external drives or an ageing NAS.
Questions about the FS6400
How much usable storage does the FS6400 give?
It depends on the drives and the RAID level. With 24 × 2 TB drives in RAID 6 you get about 44 TB before formatting. The capacity table on this page shows other combinations.
Can the FS6400 be expanded?
Yes. With Synology expansion units it supports up to 72 drive bays in total.
Can the memory in the FS6400 be upgraded?
Yes. It ships with 32 GB DDR4 ECC RDIMM and Synology lists a maximum of 512 GB.
Does the FS6400 have 10GbE?
Yes. Its network ports are 2 x 1GbE RJ-45, 2 x 10GbE RJ-45.
What warranty does the FS6400 have?
Synology lists a hardware warranty of 5 years for this model.
Do you supply the FS6400 with drives and installation?
Yes. We supply it with compatible drives fitted, configured and tested, and can install it at your office. Ask for a quote on this page.
Similar Synology models
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24-bay alternatives from other brands
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