Best RAM for the Synology DiskStation DS925+
By Devin Chua · Data checked by Owen Nakamura · Updated The Synology DiskStation DS925+ ships with 4 GB of DDR4 ECC SO-DIMM (2 slots) and officially takes 32 GB of ECC memory. What benefits from the upgrade is specific to this box: the AMD Ryzen V1500B (4 cores, 8 threads) runs Synology's apps, containers and virtual machines, and ECC is the reason to buy branded modules here. Below are matching ECC modules from Amazon.ca in CAD.
As an Amazon Associate we earn from qualifying purchases on Amazon.ca.
Compatible memory for the DS925+, live from Amazon.ca
What sets the DS925+ apart
The model the whole drive debate revolves around. Since DSM 7.3 you can fit ordinary NAS drives again, and with SHR the DS925+ makes good use of mixed drive sizes. Do not overlook: unlike the DS923+ it has no slot for a 10-gigabit card, but it ships with two 2.5-gigabit ports.
What more memory buys on the DS925+
The DS925+ takes DDR4 ECC SO-DIMM (2 slots) up to an official 32 GB, across 2 slots, starting from 4 GB. Whether that upgrade earns its money is a question about this exact box: the AMD Ryzen V1500B (4 cores, 8 threads) runs Synology's app suite, containers and several virtual machines, and those are what fill memory — plain file serving will not.
The DS925+ requires ECC memory, and that is not a marketing line: ECC corrects single flipped bits, which in a box that runs around the clock and holds your only copy of some files is the right call. Match the DDR4 ECC SO-DIMM (2 slots) spec exactly — non-ECC SO-DIMMs either are not recognized or run unreliably here. 32 GB official, ECC
The Synology drive policy on the DS925+
with a caveatPartly open, and this is the key news. On 16 April 2025 Synology announced that the 2025 Plus models would only create a storage pool with listed drives. With DSM 7.3 (version 7.3-81180, released 8 October 2025) Synology reversed that lock for hard drives and 2.5-inch SATA SSDs: Seagate IronWolf and WD Red Plus now install, initialize, pool and monitor normally. Only M.2 NVMe still requires a listed drive.
The DS925+ at a glance
| Bays | 4 × 3.5-inch SATA and 2.5-inch SATA SSD |
|---|---|
| Maximum raw capacity | 96 TB 4 × 24 TB, per the manufacturer |
| Processor | AMD Ryzen V1500B (4 cores, 8 threads) |
| Memory | 4 GB, DDR4 ECC SO-DIMM (2 slots) 32 GB official, ECC |
| M.2 NVMe | 2 slots 2 × M.2 NVMe. Note: for BOTH an NVMe cache and an NVMe storage pool, Synology still requires a drive from its own compatibility list. That is the remaining lock. |
| Network | 2 × 2.5GbE |
| Operating system | DSM 7.3 or newer |
| RAID types | SHR, SHR-2, Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10 SHR also makes use of mixed drive sizes. |
Keep calculating
To see how much capacity is left after parity, the DS925+ capacity calculator is preset to its 4 bays and RAID types. For the DS925+, the wider basics of choosing a drive are in the buying guides, where we also explain why CMR rather than SMR is mandatory in any RAID array.
Frequently asked questions
What memory does the DS925+ use?
DDR4 ECC SO-DIMM (2 slots), starting from 4 GB. 32 GB official, ECC It requires ECC modules.
Can the DS925+'s memory be upgraded?
Yes. The DS925+ has 2 slots, officially to 32 GB of ECC.
Is more RAM worth it in the DS925+?
Yes if you virtualize. The DS925+'s AMD Ryzen V1500B (4 cores, 8 threads) can run several VMs and many containers, and those are what use the extra memory; for plain file storage the stock 4 GB is enough.
Can I put third-party drives in the DS925+?
Yes. Since DSM 7.3 (8 October 2025) the DS925+ accepts third-party hard drives and 2.5-inch SATA SSDs again — Seagate IronWolf, WD Red Plus and the like install and pool normally. Only M.2 NVMe still needs a drive from Synology's list.
Devin Chua works out which drives, RAM and NVMe cache fit which NAS model at nasdrives.ca, and what the RAID choice means for usable capacity, checked against what is in stock on Amazon.ca.
Data checked by Owen Nakamura, Technical editor (data checking)