Current versus previous expandable five-bay Synology
Synology DS1525+ vs DS1522+: CPU, 2.5GbE and 10GbE Compared
DS1525+ keeps the five-bay formula but changes the platform underneath it. The current model moves from the DS1522+ dual-core/four-thread Ryzen R1600 to a four-core/eight-thread Ryzen V1500B, replaces four 1GbE ports with dual 2.5GbE, and moves expansion from DX517 to DX525. Both ship with 8GB ECC and retain an optional 10GbE route.
Quick answer
DS1525+ is the stronger clean-sheet purchase; DS1522+ can still win on price or existing DX517 investment
The new model’s CPU and built-in networking are meaningful improvements for multi-service workloads and modern LANs. DS1522+ remains capable, especially when it is already owned, heavily discounted or paired with an existing E10G22-T1-Mini and DX517 ecosystem.
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Current hardware for this Synology decision
Current and comparison DiskStation models plus the exact Synology memory, M.2, expansion and network accessories used by these Sprint 9C decisions come from this plugin's focused catalogue. Third-party NAS HDDs can be read from Cloudzat Storage Price Intelligence in read-only mode. Diskless, populated, new and renewed offers remain visibly separate.
Buying decision
The best upgrade case is CPU concurrency plus multi-gig networking, not bay count
Both systems start with five bays and can reach fifteen total drives. An existing DS1522+ owner should therefore upgrade only when the V1500B, dual 2.5GbE or current expansion generation solves a real limitation. A first-time buyer should compare the discount required to justify starting on the older accessory platform.
Interactive decision tool
DS1525+ vs DS1522+ Decision Tool
Use the exact workload, capacity and compatibility status. The tool applies current model specifications and DSM policy direction, but the Synology compatibility list remains the final check for a specific drive or accessory.
Compatibility checklist
Four checks before buying Synology hardware
Match the exact DiskStation model
A Plus-series family name is not enough. CPU, RAM ceiling, bays, network ports, M.2 support and expansion can change from one model to another.
Separate HDD and M.2 policies
DSM 7.3 gives 2025 Plus models more third-party HDD and 2.5-inch SATA flexibility, while M.2 pool/cache support remains stricter and model-specific.
Keep diskless and populated listings separate
A bundle can hide drive condition, model, warranty and price per usable terabyte. Compare enclosure value and drive value independently.
Verify media acceleration, do not infer it
An exact Intel CPU can establish that an iGPU exists, but Plex or Jellyfin acceleration still depends on codecs, licensing, package/container setup and current software support.
DS1525+ doubles the CPU core and thread count
DS1522+ uses Ryzen R1600 with two cores and four threads. DS1525+ uses Ryzen V1500B with four cores and eight threads. The older chip has higher boost clocks, but the newer platform offers more concurrency for multiple DSM applications, backup tasks, indexing and containers.
Do not translate core count into an invented percentage speedup. Single tasks can behave differently from mixed workloads. The practical advantage appears when several services run together, which is common on a five-bay business or prosumer NAS.
Factory memory remains 8GB ECC
Both models ship with 8GB DDR4 ECC memory and support up to 32GB in supported configurations. This is important because it isolates CPU and network changes: buyers are not paying for a larger starting memory configuration when moving to DS1525+.
An upgraded DS1522+ with 16GB or 32GB can still be very capable. Existing owners should compare real resource pressure before replacing the chassis. New buyers can value the shared ECC baseline and then focus on networking, CPU and expansion generation.
Built-in networking changes from four 1GbE to two 2.5GbE
DS1522+ provides four gigabit Ethernet ports. DS1525+ provides two 2.5GbE ports. The current model offers a much faster single-client path without link aggregation, while the predecessor offers more physical 1GbE interfaces for multi-network layouts.
Most modern prosumer deployments will prefer fewer faster ports, but specialized segmentation can value port count. If you need multiple isolated networks, account for switch VLANs or an add-in strategy instead of assuming dual 2.5GbE is automatically equivalent to four physical interfaces.
Both retain an official 10GbE option
DS1522+ and DS1525+ support the E10G22-T1-Mini 10GbE RJ-45 network upgrade module. This preserves an important capability across generations and prevents 10GbE alone from deciding the purchase.
The current model is more convenient before the 10GbE card is added because dual 2.5GbE is already available. If you know the card will be installed on day one, compare CPU, expansion units and total price because the built-in Ethernet difference becomes less important.
Expansion moves from DX517 to DX525
Both models can scale to fifteen drives using two five-bay expansion units. DS1522+ uses DX517, while DS1525+ uses DX525. The maximum bay count stays the same but accessory compatibility changes, which matters to anyone reusing an existing expansion investment.
A business with two working DX517 units has a powerful reason to keep DS1522+ or factor migration cost carefully. A new buyer should generally stay on the current DX525 path unless the old chassis discount is large enough to offset future accessory scarcity.
Five internal bays still make both useful without expansion
Before external units are considered, both provide five hot-swappable SATA bays. That supports a wide range of SHR and RAID layouts and makes either system a strong storage platform for backup, creators and small business.
Because native bay count is unchanged, capacity alone rarely justifies replacing DS1522+ with DS1525+. The upgrade value comes from compute, networking and lifecycle, while a buyer needing more internal bays should compare DS1825+ instead.
M.2 remains a two-slot feature
Both generations include two M.2 NVMe slots. Synology’s current support rules should be checked for exact SSD models and roles. The presence of two slots on both systems means this is not the major upgrade headline.
The V1500B and modern network may allow the DS1525+ to serve more SSD-backed applications effectively, but that is a workload-level inference rather than a physical slot advantage. Plan cache or SSD-pool use based on measured access patterns.
Drive policy is the most time-sensitive comparison point
DS1522+ launched before Synology’s 2025 drive-policy shift. DS1525+ launched under stricter rules that were later relaxed for third-party HDDs and SATA SSDs with DSM 7.3. Early launch comparisons can therefore overstate the current difference.
Use the current compatibility list for each exact drive. If you already own a set of validated disks in DS1522+, include migration support and compatibility in the upgrade plan rather than assuming every drive moves without caveats.
Plex is not the reason to choose either Ryzen model
Neither R1600 nor V1500B provides the Intel Quick Sync route. DS1525+ has more CPU threads, but that should not be marketed as guaranteed hardware-transcoding acceleration. Both are better evaluated as storage and service platforms for direct-play media.
If real-time video conversion is frequent, use capable clients or separate compute. A five-bay NAS can be excellent media storage while a mini PC handles Plex, giving you better upgrade flexibility than choosing the enclosure around transcoding.
DS1525+ makes more sense for new multi-service deployments
A current system with twice the CPU threads and 2.5GbE out of the box is easier to recommend when backup, Photos, file collaboration, containers and surveillance will coexist. The hardware changes align with a NAS being used as an always-on application appliance.
DS1522+ can still deliver the same DSM ecosystem and five-bay storage architecture. When the workload is storage-first and the older unit is discounted, software parity can make the value difference smaller than the specification table suggests.
Existing DS1522+ owners should price the whole migration
A chassis replacement may require data migration time, new expansion units, changed network configuration and verification of current drives and accessories. Those costs can dwarf a modest performance benefit. The upgrade should be tied to a bottleneck you can identify.
If CPU utilization is routinely high or gigabit is constraining fast clients, DS1525+ has a clear case. If neither is true, additional memory, 10GbE on the existing NAS or larger drives may deliver more value than replacing the head unit.
The current model wins unless the older discount is substantial
For a first purchase, DS1525+ offers the more balanced 2026 platform: V1500B, dual 2.5GbE, 8GB ECC, current expansion and optional 10GbE. DS1522+ needs a meaningful price advantage or accessory-ownership reason to overcome those improvements.
Use live listings because discontinued inventory can behave irrationally. A rare older model is not automatically a bargain. Compare a new DS1525+ against the exact condition, warranty and configuration of DS1522+ being offered.
Questions people ask
DS1525+ vs DS1522+ questions
Is DS1525+ much faster than DS1522+?
DS1525+ doubles core/thread count with V1500B and adds built-in 2.5GbE. Exact workload performance varies, but it has more concurrency headroom.
Do both have 8GB ECC RAM?
Yes, both ship with 8GB ECC and support up to 32GB.
Do both support 10GbE?
Yes. Both support the E10G22-T1-Mini 10GbE RJ-45 upgrade module.
Which has 2.5GbE?
DS1525+ has dual 2.5GbE. DS1522+ has four 1GbE ports.
Can I use DX517 with DS1525+?
Synology lists DX525 for DS1525+. Do not assume DX517 is interchangeable.
How many drives can each support?
Five internally and up to fifteen total with the supported expansion units for each generation.
Which is better for Plex?
Neither has Intel Quick Sync. DS1525+ has more CPU threads, but frequent transcoding may still be better on separate compute.
Should a DS1522+ owner upgrade?
Upgrade when CPU concurrency, built-in 2.5GbE or current accessory support solves a real problem. Otherwise the five-bay storage capability remains strong.
Are third-party HDDs supported on DS1525+?
DSM 7.3 and later broadened third-party HDD/SATA SSD flexibility for 2025 models; exact compatibility and support status still require checking.
Which is better value in 2026?
DS1525+ is the stronger new purchase unless DS1522+ is materially cheaper or you already own compatible DX517/legacy accessories.
Official references and methodology
Verify the exact Synology model and drive policy
This comparison uses Synology’s current DS1525+ specifications and DS1522+ official datasheet, focusing on verified CPU, Ethernet, memory, expansion and 10GbE differences. Current DSM drive-policy changes are incorporated separately from older launch-era restrictions.
- Synology DS1525+ product specifications
- Synology DS1522+ datasheet
- Synology drive compatibility policy
- Synology M.2 storage pool support
As an Amazon Associate, Cloudzat may earn from qualifying purchases. Prices, model revisions, DSM policies, drive lists, RAM support and marketplace conditions can change. Verify the exact NAS, drive and accessory before purchase.