Synology · Plus series
Synology DS425+
The Synology DS425+ is a 4-bay desktop NAS built around the Intel Celeron J4125 processor. Installed memory is 2 GB DDR4 non-ECC, expandable to 6 GB. Networking is 1 x 1GbE RJ-45, 1 x 2.5GbE RJ-45. It also has 2 x M.2 2280 NVMe SSD for SSD cache or fast storage.
- Drive bays
- 4
- Processor
- Intel Celeron J4125
- Memory
- 2 GB DDR4 non-ECC
- Network
- 2.5GbE
Who it suits
A 4-bay unit suits a small office that wants RAID protection with room to grow. Four drives in RAID 5 give three drives of usable space and survive one drive failure.
Synology DS425+ specifications
| Processor | Intel Celeron J4125, 4-core, 2.0 GHz (burst 2.7 GHz) |
|---|---|
| Memory installed | 2 GB DDR4 non-ECC |
| Maximum memory | 6 GB (2 GB + 4 GB) |
| Drive bays | 4 x 3.5" SATA HDD or 2.5" SATA SSD |
| M.2 slots | 2 x M.2 2280 NVMe SSD |
| Network ports | 1 x 1GbE RJ-45, 1 x 2.5GbE RJ-45 |
| USB ports | 2 x USB 3.2 Gen 1 |
| Expansion slots | none |
| HDMI | none |
| Form factor | Desktop |
| Size (H × W × D) | 166 x 199 x 223 mm |
| Weight | 2.18 kg |
| Power consumption | 28.25 W access / 6.10 W HDD hibernation |
| Noise level | 21.6 dB(A) |
| Power supply | 90 W |
| Warranty | 3 years, extendable to 5 years |
Specifications from Synology's published data, checked October 2026. See the DS425+ on Synology's website. Confirm details before ordering.
Usable capacity by RAID level
How much space the DS425+ gives with typical drive sizes.
| RAID level | 4 × 4 TB | 4 × 8 TB | 4 × 12 TB | 4 × 16 TB | 4 × 20 TB |
|---|---|---|---|---|---|
| RAID 5 | 12 TB | 24 TB | 36 TB | 48 TB | 60 TB |
| RAID 6 | 8 TB | 16 TB | 24 TB | 32 TB | 40 TB |
| RAID 10 | 8 TB | 16 TB | 24 TB | 32 TB | 40 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 DS425+
How much usable storage does the DS425+ give?
It depends on the drives and the RAID level. With 4 × 8 TB drives in RAID 5 you get about 24 TB before formatting. The capacity table on this page shows other combinations.
Can the memory in the DS425+ be upgraded?
Yes. It ships with 2 GB DDR4 non-ECC and Synology lists a maximum of 6 GB.
Does the DS425+ have 10GbE?
No. Its network ports are 1 x 1GbE RJ-45, 1 x 2.5GbE RJ-45.
What warranty does the DS425+ have?
Synology lists a hardware warranty of 3 years, extendable to 5 years for this model.
Do you supply the DS425+ 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.
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4-bay alternatives from other brands
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