Best RAM for the Synology DiskStation DS1525+
By Devin Chua · Data checked by Owen Nakamura · Updated The Synology DiskStation DS1525+ ships with 8 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.
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Compatible memory for the DS1525+, live from Amazon.ca
What sets the DS1525+ apart
Five bays is the interesting number: only from five drives does SHR-2 with double fault tolerance become economical without giving up more than a third of the capacity. Unlike the DS925+, the DS1525+ takes a 10-gigabit card.
What more memory buys on the DS1525+
The DS1525+ takes DDR4 ECC SO-DIMM (2 slots) up to an official 32 GB, across 2 slots, starting from 8 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 DS1525+ 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 DS1525+
with a caveatPartly open, like the DS925+. Since DSM 7.3 (8 October 2025) third-party hard drives and SATA SSDs are unrestricted again; only M.2 NVMe stays tied to the Synology list.
The DS1525+ at a glance
| Bays | 5 × 3.5-inch SATA and 2.5-inch SATA SSD |
|---|---|
| Maximum raw capacity | 120 TB 5 × 24 TB, per the manufacturer |
| Processor | AMD Ryzen V1500B (4 cores, 8 threads) |
| Memory | 8 GB, DDR4 ECC SO-DIMM (2 slots) 32 GB official, ECC |
| M.2 NVMe | 2 slots 2 × M.2 NVMe. For both cache and storage pool Synology still requires a listed NVMe drive. |
| Network | 2 × 2.5GbE, expandable to 10GbE with the E10G22-T1-Mini |
| 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 DS1525+ capacity calculator is preset to its 5 bays and RAID types. For the DS1525+, 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 DS1525+ use?
DDR4 ECC SO-DIMM (2 slots), starting from 8 GB. 32 GB official, ECC It requires ECC modules.
Can the DS1525+'s memory be upgraded?
Yes. The DS1525+ has 2 slots, officially to 32 GB of ECC.
Is more RAM worth it in the DS1525+?
Yes if you virtualize. The DS1525+'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 8 GB is enough.
Can I put third-party drives in the DS1525+?
Yes. Since DSM 7.3 (8 October 2025) the DS1525+ 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)