Check What Fits the DS725+ and DS1825+
DS725+: 2 SATA bays, 2 M.2 slots. DS1825+: 8 SATA bays, 2 M.2 slots. ECC memory up to 32GB
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The DS725+ takes two 3.5-inch or 2.5-inch SATA drives and two M.2 2280 NVMe drives, with ECC DDR4 memory to a limit of 32GB; one DX525 expansion unit takes it to 7 bays. The DS1825+ takes eight 3.5-inch or 2.5-inch SATA drives and two M.2 2280 NVMe drives, with ECC DDR4 memory to a limit of 32GB; two DX525 expansion units take it to 18 bays. Synology's list for both names 22 hard drives, 19 SATA SSDs and 7 M.2 drives, every one a Synology part.
What fits the DS725+ and DS1825+, slot by slot
| Part | DS725+ has | DS1825+ has | On Synology's list | If not on the list |
|---|---|---|---|---|
| 3.5-inch SATA hard drive | 2 bays | 8 bays | 22 Synology HAT drives, up to 24TB | Supported for pools |
| 2.5-inch SATA SSD | Same 2 bays | Same 8 bays | 19 Synology SAT drives | Supported for pools and cache |
| M.2 NVMe SSD | 2 x M.2 2280, not hot swappable | 2 x M.2 2280, not hot swappable | 7 Synology SNV drives | No new cache or pool |
| Memory module | 2 slots, DDR4 ECC SO-DIMM, 32 GB (16 GB × 2) | 2 slots, DDR4 ECC SO-DIMM, 32 GB (16 GB × 2) | D4ES04-4G, D4ES03-8G, D4ES03-16G | Not validated by Synology |
| Expansion unit | 7 (DX525 × 1) over USB Type-C | 18 (DX525 × 2) over USB Type-C | DX525 | Not applicable |
| Add-in card | No slot | 1 × Gen3 x8 slot (x4 link) | See Synology's list for the model | Not applicable |
Expansion and ports on the DS725+ and DS1825+
The DS725+ has a USB Type-C expansion port for the DX525: one DX525 expansion unit takes it to 7 bays. RAID 5, RAID 6, RAID 10 become available once the unit is attached. Its network ports are 1 x 2.5GbE + 1 x 1GbE. It lists no PCIe or network upgrade slot, so 2.5GbE is its ceiling.
The DS1825+ has a USB Type-C expansion port for the DX525: two DX525 expansion units take it to 18 bays. Its network ports are 2 x 2.5GbE. It has one Gen3 x8 slot (x4 link).
DS725+ and DS1825+ specifications, as Synology publishes them
| DS725+ | DS1825+ | |
|---|---|---|
| Processor | AMD Ryzen R1600, 2 cores / 4 threads | AMD Ryzen V1500B, 4 cores / 8 threads |
| Processor speed | 2.6 (base) / 3.1 (turbo) GHz | 2.2 GHz |
| Memory fitted | 4 GB DDR4 ECC SODIMM | 8 GB DDR4 ECC SODIMM |
| Memory slots and limit | 2 slots, 32 GB (16 GB × 2) | 2 slots, 32 GB (16 GB × 2) |
| Memory modules Synology lists | D4ES04-4G, D4ES03-8G, D4ES03-16G | D4ES03-8G, D4ES03-16G |
| Drive bays | 2 x 3.5-inch or 2.5-inch SATA | 8 x 3.5-inch or 2.5-inch SATA |
| M.2 slots | 2 x M.2 2280 NVMe | 2 x M.2 2280 NVMe |
| Most bays with expansion | 7 (DX525 × 1) | 18 (DX525 × 2) |
| Network ports | 1 x 2.5GbE + 1 x 1GbE | 2 x 2.5GbE |
| PCIe or network upgrade slot | None listed | 1 × Gen3 x8 slot (x4 link) |
| RAID types | SHR, Basic, JBOD, RAID 0, RAID 1, RAID 5 (with expansion unit), RAID 6 (with expansion unit), RAID 10 (with expansion unit) | SHR, Basic, JBOD, RAID 0, RAID 10, RAID 1, RAID 5, RAID 6 |
| Largest single volume | 200TB with 32GB of memory, otherwise 108TB | 200TB with 32GB of memory, otherwise 108TB |
| Power draw (Synology's test) | 20.41W in use, 7.87W with drives hibernating | 60.1W in use, 18.34W with drives hibernating |
| Noise (Synology's test) | 17.9 dB(A) | 23.8 dB(A) |
| Power adapter | 65W | 250W |
| Size and weight | 166 mm × 106 mm × 223 mm, 1.51 kg | 166 mm × 343 mm × 243 mm, 6 kg |
| Hardware warranty | 3 years | 3 years |
Where the DS725+ and DS1825+ figures come from
Read from Synology's DS725+ and DS1825+ product pages and compatibility lists on October 12, 2026. Capacities are bays times drive size in decimal terabytes.
Checked on October 12, 2026. Sources: Synology DS725+ technical specifications; Synology DS1825+ technical specifications; Synology compatibility list for the DS725+; Synology compatibility list for the DS1825+; Synology Knowledge Center: Drive compatibility policies for systems from 2025 (DSM 7.3 and above).
Go deeper
Only DS725+ and DS1825+ specifics are on this page.
RAM for the DS725+ and DS1825+ · Synology-validated M.2 NVMe drives · NAS drive basics: CMR, NAS-rated drives and SHR · Synology DSM 7.3 third-party drive policy
The DS725+ on Amazon.com today
New listings of the DS725+ itself, including bundles sold with drives fitted, which are labelled.
| Product | Capacity | Price | $ / TB | Type | Prime | Buy |
|---|---|---|---|---|---|---|
| Synology DS725+ Expandable NAS Storage - Private Cloud for Home and Small Business (2-Bay Diskless NAS)Sold by Amazon | Diskless | $527.99 | - | NAS device · network | Prime | Buy on Amazon |
| Synology DS725+ 2-Bay Diskstation NAS (Ryzen R1600, 4GB Ram), 1x 2.5GbE, 1x 1GbE, 2X M.2 NVMe Steckplätze 8TB Bundle with 2X 4TB Seagate Ironwolf | 8 TB included (2 x 4 TB) | $1,315.22 | - | NAS + drives bundle | - | Buy on Amazon |
The DS1825+ on Amazon.com today
New listings of the DS1825+ itself, including bundles sold with drives fitted, which are labelled.
The DS1825+ has no new, in-stock listing on Amazon.com right now.
Hard drives on Synology's DS725+ and DS1825+ list, in stock
| Product | Capacity | Price | $ / TB | Type | Prime | Buy |
|---|---|---|---|---|---|---|
| Synology HAT5300-16T 16 TB Hard Drive - 3.5" Internal - SATA (SATA/600) | 16 TB | $999.99 | $62.50 | NAS HDD · SATACMR | - | Buy on Amazon |
M.2 drives on Synology's list for the DS725+ and DS1825+, in stock
| Product | Capacity | Price | $ / TB | Type | Prime | Buy |
|---|---|---|---|---|---|---|
| Synology SNV5420-400G M.2 NVMe SSD 400G | 400 GB | $587.03 | $1,467.57 | M.2 NVMe | - | Buy on Amazon |
Frequently asked questions
Do the DS725+ and DS1825+ have M.2 slots?
Yes, two, for M.2 2280 NVMe drives. Only the 7 Synology SNV drives on its list can create a cache or a storage pool.
What memory does the DS725+ take?
DDR4 ECC SO-DIMM, 4GB fitted, two slots, to a limit of 32 GB (16 GB × 2). Synology lists the D4ES04-4G, D4ES03-8G, D4ES03-16G.
What memory does the DS1825+ take?
DDR4 ECC SO-DIMM, 8GB fitted, two slots, to a limit of 32 GB (16 GB × 2). Synology lists the D4ES03-8G, D4ES03-16G.
Can the DS725+ be expanded?
Yes: one DX525 expansion unit takes it to 7 bays, connected over USB Type-C.
Can the DS1825+ be expanded?
Yes: two DX525 expansion units take it to 18 bays, connected over USB Type-C.
What network ports does the DS725+ have?
1 x 2.5GbE + 1 x 1GbE.
What network ports does the DS1825+ have?
2 x 2.5GbE. There is also one Gen3 x8 slot (x4 link).