Choose the right Synology NAS
The Synology NAS Selector now compares standard Plus and neo+ versions of the current expandable 25-series platform. It weighs workload, bays, usable capacity, media needs, memory, networking and expansion, then uses your factory-memory preference to decide when neo+ value or standard Plus ECC is the better starting point.
The short answer
Which DiskStation fits your workload?
Light two-bay backup can still point to DS225+, while DS425+ remains the four-bay Intel option. For DS725, DS925, DS1525 and DS1825 families, the selector now distinguishes standard Plus from neo+: neo+ starts with 4GB non-ECC, while standard Plus starts with ECC memory and the DS1525+/DS1825+ standard models include 8GB from the factory.
What matters before buying: Choose whether you prefer lower upfront cost, factory ECC, or want the workload to decide. The selector will keep DS725+/DS725neo+, DS925+/DS925neo+, DS1525+/DS1525neo+ and DS1825+/DS1825neo+ separate rather than treating each pair as the same product.
Shop NAS models that fit your needs
Compare Synology NAS prices
Use the selector above to narrow your shortlist, then compare prices and the cost of adding drives.
At a glance
Which option makes sense for your setup?
Interactive decision tool
Synology NAS Selector and Capacity Planner
Enter how you will use the NAS. The recommendation helps narrow the choices; always confirm exact hardware specifications, current compatibility and the final purchase price.
Buying guide
Everything to check before you buy
Compare the actual hardware, software support and total configured cost. The recommendations below apply to the models named in this guide.
Start with usable storage rather than marketing specs
Estimate how much data you have today, how fast it grows and how much usable space remains after redundancy. A two-bay mirror makes management simple but requires larger replacement drives when capacity runs short. Four or five bays offer more flexibility for SHR storage growth, while eight bays suit larger archive, backup and surveillance collections.
A selector cannot see your future workload automatically. Check how much local data, photos, CCTV footage and application data you truly need before deciding on the enclosure size.
Choose models by workload, not a single universal score
For a simple two-bay household backup, start with DS225+. A DS425+ is worth considering when four bays or Intel integrated graphics are relevant. DS925+/DS925neo+ work well for expandable four-bay backup and small-office tasks; DS1525 and DS1825 families offer additional internal disks for larger data sets and team services.
The built-in tool uses your stated preferences to produce a shortlist. Use its result as a buying filter, then verify current prices and the exact DSM-compatible drives and modules.
When neo+ saves money and when Plus earns the premium
The 2026 neo+ variants ship with 4GB non-ECC memory on the same core platform as the corresponding Plus models. Standard DS725+ and DS925+ start with 4GB ECC; DS1525+ and DS1825+ start with 8GB ECC. Pay for Plus when factory ECC or more day-one memory is genuinely valuable.
If you plan to replace neo+ memory, include the cost of approved modules. Synology advises against mixing ECC and non-ECC. Compare total configured system cost, not just the unexpanded enclosure price.
Plex and media use can change the shortlist
Many clients direct-play media without serious CPU work. Hardware transcoding is different, especially with remote streams or codec incompatibility. DS225+ and DS425+ include Intel integrated graphics; Ryzen-based DS725/DS925/DS1525/DS1825 families do not offer the same Quick Sync path.
Check the present Plex/Jellyfin platform implementation, not just a processor-brand assumption. A dedicated media machine alongside the NAS may be the better answer when many concurrent conversions matter.
Pick realistic networking and expansion
A 2.5GbE connection only gives its expected benefit when switches, clients and storage can use it. DS925 family units have dual 2.5GbE; a DS225+ combines 2.5GbE and 1GbE. Some larger 25-series systems offer supported faster-networking upgrades.
Expansion support is model-specific: current 25-series families use DX525, while some older Plus devices use DX517. An existing expansion chassis may strongly influence the best new NAS purchase.
Final check before you buy the chosen NAS
Verify the complete exact model in the Amazon title; RAM modules and drive trays are not NAS enclosures. Distinguish diskless from drive-loaded bundles and compare condition, seller and warranty. Select HDDs separately after reading your model's current compatibility list and the applicable DSM 7.3 policy.
Budget an appropriately sized UPS, an independent backup destination, a spare drive where needed, and a restore plan you have actually tested. Even a feature-rich NAS cannot prevent every theft, deletion or ransomware incident.
Common questions
Common questions answered
Does the selector include the new Synology neo+ models?
Yes. It treats DS725neo+, DS925neo+, DS1525neo+ and DS1825neo+ as separate models and compares them with the corresponding standard Plus versions.
Will the selector guarantee Plex transcoding?
No. It can identify an Intel integrated-graphics path or recommend external compute, but Plex support depends on codecs, licensing and current software configuration.
Can it calculate usable SHR capacity exactly?
It provides a planning direction. Final usable capacity should be checked with the exact drive set and Synology RAID calculator because mixed sizes and layout matter.
Why are older models included?
DS224+, DS423+, DS923+ and other previous models remain actively used and may offer Intel graphics, optional 10GbE, existing expansion compatibility or better prices.
How does the selector decide between Plus and neo+?
It uses your factory-memory preference plus workload pressure. Lower-cost preference can favor neo+, while factory ECC, heavier business services, more users or heavier containers can favor the standard Plus version.
Should every home buy a four-bay NAS?
No. A two-bay system can be sufficient for modest mirrored capacity, while larger models are justified by expansion, redundancy and workload needs.
How much spare bay capacity should I keep?
Avoid a design that fills every bay immediately when growth is expected. One or more free bays can simplify expansion and drive replacement.
When is 10GbE useful?
It helps large local transfers, multiple fast clients and SSD-backed workflows. It does not improve remote access beyond the WAN bottleneck.
Can DS925+ hardware transcode 4K Plex?
The DS925+ does not provide the Intel Quick Sync path. Direct play is practical; frequent conversion should be evaluated with external compute or a different platform.
What should I verify after using the selector?
Confirm the exact product page, drive compatibility, RAM module, M.2 support, expansion unit, bundle contents, warranty and current DSM policy.
Synology specifications and compatibility
Specifications and compatibility guidance come from the Synology product and support documents linked below. Check current Amazon prices and the seller's description before ordering. A price marked as last checked on an earlier date may have changed.
- Synology neo+ Series launch announcement
- Synology DS725+ / DS725neo+ specifications
- Synology DS925+ / DS925neo+ specifications
- Synology DS1525+ / DS1525neo+ specifications
- Synology drive compatibility policies for 2025+ systems
- Synology Products Compatibility List
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