Compare Asustor and Synology, Model Against Model
2 matched pairs, each from the maker's own specification page
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At two bays, Asustor AS5402T against Synology DS225+: both have two SATA bays; the AS5402T has four M.2 slots and the DS225+ none; network ports are 2 x 2.5GbE on the AS5402T against 1 x 1GbE + 1 x 2.5GbE on the DS225+; memory tops out at 16GB on the AS5402T and 6GB on the DS225+. At four bays, Asustor Lockerstor 4 Gen2+ against Synology DS425+: both have four SATA bays; the Lockerstor 4 Gen2+ has four M.2 slots and the DS425+ two; network ports are 2 x 5GbE on the Lockerstor 4 Gen2+ against 1 x 1GbE + 1 x 2.5GbE on the DS425+; memory tops out at 16GB on the Lockerstor 4 Gen2+ and 6GB on the DS425+.
AS5402T against DS225+: the published specifications
| Asustor AS5402T | Synology DS225+ | |
|---|---|---|
| Processor | Intel Celeron N5105, quad core 2.0 GHz (burst to 2.9 GHz) | Intel Celeron J4125 |
| Memory | 4GB DDR4, up to 16GB | 2GB DDR4, up to 6GB |
| Drive bays | 2 SATA | 2 SATA |
| Largest drive quoted or listed | 18TB | 24TB |
| M.2 NVMe slots | 4 (PCIe 3.0 x1) | None |
| Network ports | 2 x 2.5GbE | 1 x 1GbE + 1 x 2.5GbE |
| RAID types listed | Single, JBOD, RAID 0, RAID 1 on the SATA bays; RAID 5, 6 and 10 as well on an M.2 volume | Basic, JBOD, RAID 0, RAID 1, SHR |
| Power draw, maker's test | 22.9W in operation, 12.7W with disks hibernating | Not published |
| Drive policy | No policy stated on its specification page | Its compatibility list names only Synology drives; from DSM 7.3 third-party hard drives and SATA SSDs can build storage pools |
What separates the AS5402T and the DS225+
Shared: two SATA bays.
The AS5402T has four M.2 slots and the DS225+ none.
Network ports are 2 x 2.5GbE on the AS5402T against 1 x 1GbE + 1 x 2.5GbE on the DS225+.
Memory tops out at 16GB on the AS5402T and 6GB on the DS225+.
The AS5402T ships with 4GB of DDR4 and the DS225+ with 2GB of DDR4.
The largest drive the maker quotes or lists is 18TB for the AS5402T and 24TB for the DS225+.
The processors are the Intel Celeron N5105 and the Intel Celeron J4125.
Drive rules for the DS225+: its compatibility list names only Synology drives; from DSM 7.3 third-party hard drives and SATA SSDs can build storage pools. Asustor's specification page for the AS5402T states no such policy.
Lockerstor 4 Gen2+ against DS425+: the published specifications
| Asustor Lockerstor 4 Gen2+ | Synology DS425+ | |
|---|---|---|
| Processor | Intel Celeron N5105, quad core 2.0 GHz (burst to 2.9 GHz) | Intel Celeron J4125 |
| Memory | 4GB DDR4, up to 16GB | 2GB DDR4, up to 6GB |
| Drive bays | 4 SATA | 4 SATA |
| Largest drive quoted or listed | 18TB | 24TB |
| M.2 NVMe slots | 4 (PCIe 3.0 x1) | 2 |
| Network ports | 2 x 5GbE | 1 x 1GbE + 1 x 2.5GbE |
| RAID types listed | Single, JBOD, RAID 0, 1, 5, 6, 10 | Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, SHR, SHR-2 |
| Power draw, maker's test | 35W in operation, 17.3W with disks hibernating | Not published |
| Drive policy | No policy stated on its specification page | Its compatibility list names only Synology drives; from DSM 7.3 third-party hard drives and SATA SSDs can build storage pools, and an M.2 drive that is not on the list cannot create a pool or a cache |
What separates the Lockerstor 4 Gen2+ and the DS425+
Shared: four SATA bays.
The Lockerstor 4 Gen2+ has four M.2 slots and the DS425+ two.
Network ports are 2 x 5GbE on the Lockerstor 4 Gen2+ against 1 x 1GbE + 1 x 2.5GbE on the DS425+.
Memory tops out at 16GB on the Lockerstor 4 Gen2+ and 6GB on the DS425+.
The Lockerstor 4 Gen2+ ships with 4GB of DDR4 and the DS425+ with 2GB of DDR4.
The largest drive the maker quotes or lists is 18TB for the Lockerstor 4 Gen2+ and 24TB for the DS425+.
The processors are the Intel Celeron N5105 and the Intel Celeron J4125.
Drive rules for the DS425+: its compatibility list names only Synology drives; from DSM 7.3 third-party hard drives and SATA SSDs can build storage pools, and an M.2 drive that is not on the list cannot create a pool or a cache. Asustor's specification page for the Lockerstor 4 Gen2+ states no such policy.
Where the figures come from
Each row was read from the maker's own specification page for the model on October 12, 2026. "Not published" means the maker's page gives no figure, so none is stated here. Prices are live Amazon.com listings and change through the day.
Checked on October 12, 2026. Sources: Asustor AS5402T hardware specifications; Synology DS225+ technical specifications; Asustor Lockerstor 4 Gen2+ (AS6704T v2) hardware specifications; Synology DS425+ technical specifications; Synology Knowledge Center: Drive compatibility policies for systems from 2025 (DSM 7.3 and above).
The compared models on Amazon.com today
New listings of the models compared on this page. A bundle sold with drives or accessories says so in its title.
Frequently asked questions
Which has more M.2 slots, the AS5402T or the DS225+?
The AS5402T has four; the DS225+ has none.
Which takes more memory, the AS5402T or the DS225+?
The AS5402T, to 16GB against 6GB.
Which has more M.2 slots, the Lockerstor 4 Gen2+ or the DS425+?
The Lockerstor 4 Gen2+, with four against two.
Which has the faster network port, the Lockerstor 4 Gen2+ or the DS425+?
The Lockerstor 4 Gen2+: 2 x 5GbE, against 1 x 1GbE + 1 x 2.5GbE.
Which takes more memory, the Lockerstor 4 Gen2+ or the DS425+?
The Lockerstor 4 Gen2+, to 16GB against 6GB.