Best RAM for the Synology DiskStation DS423+
By Devin Chua · Data checked by Owen Nakamura · Updated · Prices checked The Synology DiskStation DS423+ ships with 2 GB of DDR4 SO-DIMM, no ECC (2 GB soldered plus 1 slot) and officially takes 6 GB. What benefits from the upgrade is specific to this box: the Intel Celeron J4125 (4 cores) hardware-transcodes and runs containers, and those, not plain file storage, are what more memory feeds. Below are modules from Amazon.ca that meet Synology's published limits, in CAD.
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Want to know whether the DS423+ fits your actual storage plan? Open the NAS Builder with this model weighted.
Memory that fits the DS423+, from Amazon.ca
| Module | Size | Type | Price | |
|---|---|---|---|---|
 Timetec DDR4-2666 4GB Replacement for Synology D4NESO-2666-4G Non-ECC Unbuffered SODIMM (Compatible for RS820RP+, RS820+, DS920+, DS720+, DS420+, DS220+, DS2419+, DS2419+II, DS1819+, DVA3219, DS1618+)New DDR4 SO-DIMM, within Synology's 4 GB per module for the DS423+; Synology's own module for this model Amazon.ca · sold by Amazon US · one memory module; shipping and taxes not included · checked Oct 15, 2026 · ships from the US through Amazon.caCA$62Buy on Amazon | 4 GB | DDR4 SO-DIMM non-ECC | CA$62 | Buy on Amazon |
Left out as not fitting the DS423+: 158 listings (DDR5, ECC module, 2-module kit, 48 GB modules).
What more memory buys on the DS423+
The DS423+ takes DDR4 SO-DIMM, no ECC (2 GB soldered plus 1 slot) up to an official 6 GB, across 1 slot, starting from 2 GB. Whether that upgrade earns its money is a question about this exact box: the Intel Celeron J4125 (4 cores) transcodes Plex and runs containers, and it is the containers, not the file shares, that ask for more RAM.
The DS423+ uses non-ECC DDR4 SO-DIMM, no ECC (2 GB soldered plus 1 slot), so a flipped bit is not corrected. That is rarely a problem in practice, but it is why DIY TrueNAS builders insist on ECC. Synology supports modules up to 4 GB in the DS423+, so match the generation, the module form and the size, and standard non-ECC modules are fine. 6 GB official (2 GB fixed plus a 4 GB module). In practice a 16 GB module runs (giving 18 GB); Synology does not endorse it.
Drive policy: Synology's 2025 drive policy applies only to models launched from 2025, so the DS423+ takes third-party hard drives and 2.5-inch SATA SSDs as it always has. The DS423+’s full compatibility rules.
Keep calculating
To see how much capacity is left after parity, the DS423+ capacity calculator is preset to its 4 bays and RAID types. For the DS423+, the wider basics of choosing a drive are in the buying guides, and CMR versus SMR explains why SMR drives do not belong in a RAID array. Wondering what the DS423+ can actually do: Plex, Immich, Docker, VMs? See what the DS423+ can run.
Frequently asked questions
What memory does the DS423+ use?
DDR4 SO-DIMM, no ECC (2 GB soldered plus 1 slot), starting from 2 GB. 6 GB official (2 GB fixed plus a 4 GB module). In practice a 16 GB module runs (giving 18 GB); Synology does not endorse it. It uses standard non-ECC modules.
Can the DS423+'s memory be upgraded?
Yes. The DS423+ has one slot, officially to 6 GB.
Is more RAM worth it in the DS423+?
Only if you run containers. The DS423+'s Intel Celeron J4125 (4 cores) transcodes and runs Docker well, and it is the containers, not file shares, that ask for more than the stock 2 GB.
Can I put third-party drives in the DS423+?
Yes. Synology's 2025 drive policy applies only to models launched from 2025, so the DS423+ takes third-party hard drives and 2.5-inch SATA SSDs as it always has.
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)