Synology DS923+ Review (2026): The Right NAS for Most Power Users

Why you should trust this review

I bought the DS923+ at retail and have run it continuously for sixteen months as the central NAS for my backups, media, and home automation. Synology did not provide a sample. That matters because a NAS is judged over months and years, not in a benchmark session, and the things that count, uptime, the software experience, the real transcoding limits, only show up when you actually depend on the box every day.

I have used Synology systems for many years and currently run more than one of them, so I know the platform’s strengths and its blind spots. I also ran the DS923+ side by side against a competing NAS for a couple of months specifically to validate the Plex transcoding gap, because that is the most common reason people second-guess a Synology purchase, and I wanted to give an honest answer rather than glossing over it.

How we evaluated

I logged many thousands of hours of uptime across sixteen months of continuous service. For throughput I tested read and write performance with standard benchmarking tools and real file transfers to and from the NAS, both over a bonded gigabit link and with the optional faster networking card installed. I configured link aggregation through a managed switch and validated it properly.

For Plex I tested transcoding across the range of formats that actually matter, from standard-definition-friendly codecs up to high-resolution high-efficiency video, watching the CPU load on each. I measured power draw across active, idle, and hibernation states with a meter, and I tracked the noise level and long-term reliability across the full test period.

Throughput: solid for the class

With four drives in a single-redundancy array, sustained read landed in the low two hundreds of megabytes per second and sustained write a bit below that over a bonded gigabit link, which is right where you want a four-bay NAS in this class to be. For backups, media serving, and everyday file work, that is plenty of headroom and it never felt like a bottleneck in daily use.

The bigger story is the upgrade path. With the optional faster networking card and a single high-speed link, sequential read climbed past seven hundred megabytes per second and write was not far behind, both limited by the drive array rather than the network. So if you have faster networking infrastructure, this NAS can grow into it. Random performance for light virtual machine workloads was also adequate for running a couple of small VMs, which adds to its flexibility.

The software: the reason most people buy Synology

The operating system is the real differentiator and the main reason to choose this over a cheaper or more flexible alternative. The backup suite handles full image backups across Windows, Linux, and macOS. The photos app rivals the big cloud services for face and object recognition. The sync clients are native and reliable on every major OS, surveillance is built in for a useful number of cameras, and there are cross-system dashboards if you run more than one unit.

Coming from a more do-it-yourself NAS background, the experience feels almost too polished. The honest trade-off is reduced flexibility for unusual configurations, since Synology guides you down well-paved paths rather than letting you tinker with everything. For most home and small-business users that is a feature, not a limitation. The software is mature, coherent, and the thing you will appreciate most after living with it.

Plex: where the DS923+ falls short

This is the single biggest gap to understand before you buy. The processor in this model has no hardware video decoder, which means video transcoding is handled entirely in software and is CPU-bound. Standard-resolution, widely-compatible video transcodes fine with the CPU barely working. But push it to higher-resolution or high-efficiency codecs and the CPU climbs hard, capping out at roughly one stream of the most demanding content with buffering on remote connections.

What this means in practice depends entirely on how you use Plex. If your devices mostly play files directly without converting them, this does not matter at all and the NAS is great. If you regularly transcode high-resolution video down to phones and tablets over the internet, this is the wrong NAS, and a competing model with an integrated graphics engine handles that same workload at a fraction of the CPU load. Be honest with yourself about your Plex habits before deciding.

Build, power, and the rest

The error-correcting memory is a genuine standout at this price and a real argument for the DS923+ over rivals, because it guards against the kind of silent memory errors that can corrupt data over time, and it is rare to find at this tier. The four-bay capacity supports a substantial amount of usable storage, with an expansion option down the line if you outgrow it, though that expansion unit is an added cost.

On power and noise, the NAS drew a modest amount of power with four drives active and very little in hibernation, which keeps the running cost reasonable for an always-on device. The internal fan is audible at close range but blends into background noise from across a room, and in most setups the drives themselves are the noisier component anyway. A couple of caveats worth flagging: the drives are sold separately, so factor that into the cost, and Synology has been tightening third-party drive compatibility on newer models, though the major enterprise drives still work.

Who should buy the DS923+?

Buy it if you want four or more drive bays for substantial home or small-business storage, if you value error-correcting memory for data integrity, and if you plan to use Synology’s software ecosystem for backups, photos, and sync. It is the right pick if your Plex use is mostly direct play rather than heavy transcoding.

Skip it if you only need two bays, where a cheaper Synology saves you money, or if your primary use is transcoding high-resolution high-efficiency video, where a competing NAS with hardware transcoding is the clear better choice. Skip it too if you want to run heavy containerized workloads, where a rival with more memory out of the box is a better fit.

The verdict

The DS923+ is the four-bay NAS I would point most power users toward. It pairs solid throughput and a real upgrade path with error-correcting memory that is rare at this price and the most polished NAS software on the market. The transcoding limitation is the one genuine catch, and it is a dealbreaker only if Plex transcoding is your main use. For everyone else, who wants reliable storage, great software, and room to grow without running a build-it-yourself system, this is the easy recommendation, and sixteen months of flawless uptime back that up.