Synology DS224+ vs DS923+
Buy the Synology DS224+ for a photo, file and backup appliance that just works, and the DS923+ for storage you plan to keep for years. Both run DSM, the most polished NAS operating system there is, so the decision is hardware. The DS224+ is the entry 2-bay: a Celeron J4125 that handles hardware H.264/H.265 transcoding, 2GB of RAM expandable to about 6GB, no NVMe slots and 1GbE only. The DS923+ is the prosumer 4-bay: ECC memory expandable to 32GB ECC, two M.2 NVMe slots, an optional 10GbE add-in card and a DX517 expansion unit, but its Ryzen R1600 has no integrated GPU, so it cannot hardware transcode. The price bands differ too: our data lists the DS224+ as entry / budget tier and the DS923+ as prosumer / upper-mid tier, enclosure only.
The mistake this comparison exists to prevent: assuming the more expensive Synology does everything the cheaper one does, plus more. It does not. The DS923+ gives up hardware transcoding, which the DS224+ has, in exchange for ECC, bays and headroom. If Plex or Jellyfin is the main job, the cheaper box is the better one. Decide what the NAS is for before you decide which one is "better".
Side by side
| Feature | Synology DS224+ | Synology DS923+ |
|---|---|---|
| Bays | 2 bays | 4 bays |
| CPU | Intel Celeron J4125 quad-core | AMD Ryzen R1600 dual-core |
| Hardware transcoding | Yes, hardware H.264/H.265 | None, no hardware transcoding |
| Memory | 2GB DDR4 onboard, to 6GB (non-ECC) | 4GB DDR4 ECC, to 32GB ECC |
| Networking | 2× 1GbE (link aggregation) | 2× 1GbE (10GbE via add-in card) |
| NVMe slots | None | 2× M.2 NVMe (2280) |
| Expansion | Not stated | DX517 expansion unit |
| Operating system | DSM | DSM (Btrfs snapshots, backup suite) |
| Price band | Entry / budget tier (enclosure only, drives extra) | Prosumer / upper-mid tier (enclosure only) |
Bays: the 2-bay mirror math against the 4-bay sweet spot
A 2-bay in RAID 1/SHR mirror yields only half its raw space (2×8TB = 8TB usable), enough for documents, photos and backups, tight for media hoards, and expanding means replacing both drives. A mirror's capacity is set by its smaller drive, so growing a full 2-bay means swapping one 8TB for a 16TB and still having 8TB usable until the second 16TB goes in. A 4-bay in RAID 5/SHR-1 yields (n-1) drives of capacity (4×8TB ≈ 24TB usable) with single-drive tolerance and one-drive-at-a-time upgrades, and you can start it with just two drives and fill bays later. That is the strongest argument for the DS923+ even if your data is small today. Our how many bays do you need guide has the full math.
Transcoding: the cheaper Synology wins
The DS224+'s Celeron J4125 handles Plex hardware transcoding of common codecs (H.264/H.265). The DS923+'s AMD Ryzen R1600 has no iGPU at all, so it is a poor choice for Plex or Emby hardware transcoding; plan on direct-play or a separate transcoding box. That is not a small performance gap; it is a missing capability, and it sits on the more expensive machine.
This only matters if you actually transcode. If your library is already in formats your TVs, phones and tablets play natively, the NAS just serves the file and the CPU barely notices. Our best NAS for a home media server guide covers how to tell which situation you are in before you spend. The DS224+'s 1GbE and 2GB base RAM make it the weakest of our 2-bay picks for a media-heavy setup, but it can do the job the DS923+ cannot.
ECC memory and RAM headroom: what the extra money on the DS923+ buys
ECC memory detects and corrects single-bit errors before they reach disk. It matters because RAID does not protect you from bad data; RAID protects you from a drive dying. If memory corrupts a byte on its way to being written, RAID faithfully writes the corrupted byte to every drive in the array. ECC is the layer that catches that, and finding it in a 4-bay desktop NAS is genuinely unusual. The DS224+ has 2GB soldered plus one SODIMM slot with an official maximum of about 6GB, none of it ECC; the DS923+ starts at 4GB and reaches 32GB of ECC.
Keep it in proportion, though. ECC is not a substitute for backups, and a non-ECC NAS with a real 3-2-1 backup is in better shape than an ECC NAS without one. If you have not read why RAID is not a backup, start there, and ECC is nice, not mandatory covers the rest. Whether a NAS can run Docker containers and virtual machines is set mostly by its CPU class and RAM, not the marketing. The Intel Celeron/N-series and low-power AMD chips in these boxes handle a handful of lightweight Docker containers (Pi-hole, a *arr stack, small databases) comfortably with 4–8GB RAM; running full virtual machines, or many heavy containers at once, wants a stronger CPU and 8–16GB+. ARM-based budget NAS units and some entry models don't support VMs or full container platforms at all. If self-hosting is your goal, prioritize an x86 (Intel/AMD) NAS with expandable RAM. See how much RAM a NAS needs and the Docker and VM guide for where 2GB, 6GB and 32GB each run out.
Networking, NVMe and upgrade paths
Both ship two 1GbE ports. 2.5GbE matters because 1GbE is the real bottleneck in most NAS setups. A 1GbE link tops out around 110–118MB/s of actual throughput — and a single modern hard drive already reads at roughly 180–280MB/s sequentially, so on gigabit you're leaving half the drive's speed on the table, and a RAID array or NVMe cache is throttled even harder. 2.5GbE lifts the ceiling to ~280MB/s, roughly matching one fast HDD and dramatically improving large-file transfers. It's the single most worthwhile 'speed' upgrade for home NAS; 10GbE only pays off with NVMe pools or many-drive arrays. The DS923+ at least offers a 10GbE upgrade card, but the DS224+ has no multi-gig path at all. See 2.5GbE vs 1GbE for whether that ceiling will actually show up in your workflow.
The DS224+ has no NVMe slots at all; if cache or an NVMe pool matters to you, it is a reason to look at the DS923+'s two M.2 slots, with the caveat that NVMe storage pools on the Plus line officially expect Synology drives. See NVMe cache explained. Longer term, the DS923+'s DX517 unit adds bays and its add-in card adds bandwidth; the site holds no stated expansion path for the DS224+ beyond its 2GB-plus-one-SODIMM memory slot.
Power draw
Synology publishes HDD-hibernation and access figures for both: 4.41W hibernating and 14.69W on access for the DS224+, 11.52W and 35.51W for the DS923+, per each model's product specification PDF. The NAS Power Cost Index converts those to annual cost and explains why vendor idle labels are not directly comparable.
What to watch out for on each
Both: the drive compatibility policy. Older Plus models like the DS923+ and DS224+ are more permissive than the 2025 Plus generation but still publish a compatibility list. The push is felt most on the DS923+, where NVMe storage pools and some HDD features officially expect Synology drives. The DS224+ still runs third-party drives, but verify the current compatibility list before buying. We cover this in Synology drive compatibility explained.
DS224+: the ceilings. Only 1GbE networking caps real-world throughput near ~110MB/s, which a single modern hard drive can already exceed; 2GB base RAM is tight for many apps; and there is no NVMe. It is the lowest-friction way into NAS, not the box that grows with a homelab.
DS923+: no iGPU. If the NAS is going to feed Plex to phones and older TVs, this is the wrong Synology. Budget for a separate transcoding box or pick the DS224+.
Both: the drives. Each ships as an empty enclosure. Use CMR NAS-rated drives, never SMR in an array; see CMR vs SMR.
Verdict
Choose the Synology DS224+ if you want photos, files and backups working tonight with zero homelab tinkering, a 2-bay mirror covers your data, and light Plex duty is part of the job. It is the easiest way to get DSM.
Choose the Synology DS923+ if you are building storage you plan to keep for years and want ECC memory, RAM headroom to 32GB, two M.2 slots, a real 10GbE upgrade path and four bays you can fill over time, accepting that media transcoding is not its job and that Synology's drive policy needs checking first.
Frequently Asked Questions
Buy the Synology DS224+ if you want photos, files and backups working tonight with zero homelab tinkering: it is the lowest-friction way into NAS, its Celeron J4125 handles Plex hardware transcoding of common codecs, and it sits in the entry / budget tier. Buy the DS923+ if you are building storage you plan to keep for years: four bays, ECC memory expandable to 32GB ECC, two M.2 NVMe slots, an optional 10GbE add-in card and a DX517 expansion unit, at prosumer / upper-mid tier pricing. Both run DSM, so the software experience is the same; the difference is bays, headroom and data-integrity hardware.
The cheaper one. The DS224+'s Celeron J4125 has an integrated GPU that handles hardware H.264/H.265 transcoding of common codecs. The DS923+'s AMD Ryzen R1600 has no integrated GPU, so there is no hardware transcoding; you are relying on direct play, where the client plays the file as-is, or on a separate transcoding box. The DS224+'s limits for a media-heavy setup are its 1GbE and 2GB base RAM, not its ability to transcode.
For file sharing, photo backup and simple sync with no containers or VMs, yes; that is the class of use the entry 2-bay boxes are built for. It is tight for many apps. The DS224+ has 2GB soldered plus one SODIMM slot with an official maximum of about 6GB, which is enough for light Docker but not for VMs. The DS923+ starts at 4GB and reaches 32GB of ECC, which is the ceiling with real headroom if the stack grows.
No, it is a nice-to-have, not a requirement. ECC corrects single-bit memory errors and is reassuring on always-on systems with lots of RAM and irreplaceable data, and finding it in a 4-bay desktop NAS is genuinely unusual. But a tested backup protects your data far more than ECC does; a non-ECC NAS with a real 3-2-1 backup is safer than an ECC NAS without one. Treat ECC on the DS923+ as a bonus.
A 2-bay in RAID 1 or SHR mirror yields only half its raw space (2×8TB = 8TB usable), enough for documents, photos and backups, tight for media hoards, and expanding means replacing both drives. A 4-bay in RAID 5 or SHR-1 yields (n-1) drives of capacity (4×8TB ≈ 24TB usable) with single-drive tolerance and one-drive-at-a-time upgrades, and you can start it with just two drives and fill bays later. That is why the 4-bay is the sweet spot for most buyers, and why a DS923+ running two drives at first is often the smarter long-term buy.
Both are older Plus models, which are more permissive than the 2025 Plus generation but still publish a compatibility list. The DS224+ still runs third-party drives; verify the current compatibility list before buying. The policy is felt most on the DS923+, where NVMe storage pools and some HDD features officially expect Synology drives. Policies are delivered through DSM updates and compatibility-list revisions, so check the official list for your exact model rather than relying on forum memory.