Synology DS925+ vs DS725+ — Which to Buy in Australia?

The Synology DS925+ and DS725+ are both 2025-generation Plus series NAS units running DSM 7.3, but they target different buyers. The DS925+ is a 4-bay unit with a quad-core AMD Ryzen V1500B and dual 2.5GbE ports, priced from $995 at Scorptec. The DS725+ is a compact 2-bay with an AMD Ryzen R1600 dual-core and a single 2.5GbE port, priced at $869 from both Mwave and Scorptec. Both support ECC RAM up to 32GB, both have two M.2 NVMe slots, and both connect to the new DX525 expansion unit via USB-C. The question is whether you need four bays from day one, or whether two bays with the option to expand is enough.

Quick Spec Comparison

Prices last verified: 27 February 2026. Always check retailer before purchasing.

The CPU Difference Matters More Than You Think

On paper, the DS725+ looks appealing. Its AMD Ryzen R1600 clocks higher at 2.6 GHz base (3.1 GHz turbo) compared to the DS925+'s V1500B at 2.2 GHz. For simple file transfers and single-threaded workloads, the R1600 is marginally quicker. But that is where its advantage ends.

The DS925+'s V1500B has four physical cores and eight threads. Double what the R1600 offers with its two cores and four threads. This matters enormously for the workloads that make a Synology Plus series NAS worth buying in the first place: running Docker containers, scheduled Hyper Backup jobs to cloud or USB, Active Backup for Business pulling snapshots from multiple PCs, Synology Drive sync across several users, and Surveillance Station processing camera feeds. These are all concurrent, multi-threaded tasks. A dual-core processor will bottleneck noticeably when three or four of these run simultaneously.

The V1500B also draws less power. 16W TDP versus 25W for the R1600. Over a year of 24/7 operation, that difference adds up. For a device that sits on a shelf and runs around the clock, lower power consumption is a genuine advantage, not a marketing spec.

Networking: Dual 2.5GbE vs Mixed Ports

The DS925+ has two 2.5GbE RJ-45 ports. The DS725+ has one 2.5GbE and one 1GbE. For most Australian home networks running standard gigabit switches, this difference is academic. Both units will saturate a 1GbE link without breaking a sweat.

The difference matters if you are upgrading to a 2.5GbE switch (increasingly affordable in 2026) and want to use link aggregation or failover between two matched ports. The DS925+'s dual 2.5GbE ports support proper link aggregation for up to 5Gbps aggregate throughput to a compatible switch. The DS725+'s mixed ports limit you to aggregating mismatched speeds, which is less effective.

Neither unit has a PCIe expansion slot, which means neither can be upgraded to 10GbE. This is a step backwards from their predecessors (the DS923+ and DS723+, which both supported the E10M20-T1 combo adapter). If 10GbE is a requirement, you will need to look at the DS1525+ or higher. For most home and small office deployments on standard Australian NBN connections, 2.5GbE is more than sufficient for internal transfers, and remote access is bottlenecked by NBN upload speeds (typically 20-50 Mbps on standard plans) long before the NAS becomes the limiting factor.

Storage Capacity: 4 Bays vs 2 Bays

This is the most straightforward difference between the two units. The DS925+ gives you four bays; the DS725+ gives you two. Both can add five more bays via the DX525 expansion unit ($879 at Mwave).

With two bays, your only redundancy option is RAID 1 (mirroring), which gives you the usable capacity of a single drive. Two 8TB drives in RAID 1 give you 8TB of usable space. With four bays, you unlock RAID 5 (or Synology's SHR), which gives you the capacity of three drives with one drive of redundancy. Four 8TB drives in SHR give you 24TB of usable space. Triple what the 2-bay offers with the same drives.

The maths is clear. With current Australian NAS hard drive pricing. A Synology HAT3300-8T (8TB) costs $499 at Scorptec. The total cost of a DS925+ with four 8TB drives is approximately $2,991 for 24TB usable. A DS725+ with two 8TB drives costs approximately $1,867 for 8TB usable. Per usable terabyte, the DS925+ works out cheaper despite the higher upfront cost.

What About the DX525 Expansion Route?

The DS725+ can expand to seven total bays with a DX525 ($879 at Mwave). On paper, this makes it seem like a viable path to larger storage. In practice, there are caveats worth understanding.

First, the DX525 costs $879. Nearly as much as the DS725+ itself. A DS725+ plus DX525 comes to $1,748, which is significantly more than a DS925+ at $995-$1,029 for four native bays. If you know you will need more than two bays within the next two years, the DS925+ is the far more cost-effective starting point.

Second, while the DX525 connects via USB-C and supports hot-swap, expansion units add a point of failure and latency compared to internal bays. For most home users this is negligible, but for business deployments where uptime matters, fewer external dependencies is better.

The DX525 makes sense for the DS725+ buyer who starts with two bays and genuinely does not need more for several years. It does not make sense as a planned day-one purchase. Buy the DS925+ instead.

M.2 NVMe Slots: Same on Both

Both the DS925+ and DS725+ have two M.2 2280 NVMe slots on the underside of the unit. These can be used as SSD cache (read-only or read-write) or as a standalone all-flash storage pool. Both use PCIe 3.0, which is getting long in the tooth but is adequate for NAS caching workloads.

One important caveat: Synology's M.2 NVMe restrictions remain in place even after the DSM 7.3 reversal of the broader drive compatibility policy. Only drives on Synology's Hardware Compatibility List can be used to create new NVMe cache or storage pools. Third-party NVMe drives that are not on the list will be blocked. Check the compatibility list before purchasing M.2 drives.

Drive Compatibility: The 2025 Saga

Both the DS925+ and DS725+ launched during Synology's controversial drive compatibility lockdown in early 2025. Synology initially restricted these Plus series models to Synology-branded or specifically certified hard drives, locking out popular third-party options from Seagate and Western Digital. The backlash was immediate and severe.

Synology reversed course with DSM 7.3 in October 2025, restoring third-party 3.5-inch HDD and 2.5-inch SATA SSD support on desktop Plus series models including both the DS925+ and DS725+. You can now use Seagate IronWolf, WD Red Plus, and other mainstream NAS drives without losing core functionality like storage pool creation or drive health monitoring.

However, the reputational damage lingers. Some long-time Synology users have moved to QNAP or TrueNAS and are not coming back. If you are evaluating Synology in 2026, know that the products themselves remain excellent. DSM is still the most user-friendly NAS operating system available. But the company demonstrated a willingness to restrict hardware flexibility that buyers should factor into their long-term planning.

AU Pricing Breakdown

Australian pricing for both units is remarkably consistent across major retailers, which is typical for Synology. NAS margins in Australia sit around 3-5%, leaving retailers little room to differentiate on price. The meaningful differences between retailers are stock availability, pre-sales guidance, and after-sales support.

The DS925+ at Scorptec ($995) is the best current deal in Australia, coming in $34 cheaper than Mwave's $1,029. For the DS725+, both Mwave and Scorptec list it at $869. If you are buying from a specialist retailer, Scorptec and PLE tend to offer genuine pre-sales advice and carry strong Synology stock thanks to their distributor relationships with BlueChip and MMT, who both hold deep Synology inventory across the range.

For business, education, or government purchases, always request a formal quote rather than buying at the listed retail price. Resellers can request pricing support from their distributors, and both BlueChip and MMT are known to sharpen pricing for larger or project-based deals. These discounts never appear on the website but are routinely available for quoted purchases.

Who Should Buy the DS925+?

The DS925+ is the right choice for most Australian buyers considering either of these units. Here is who it suits best:

Small business and home office users who need Active Backup for Business to protect multiple workstations, Synology Drive for file sync across a team, or Docker containers running apps like Paperless-ngx, Vaultwarden, or Home Assistant. The quad-core V1500B handles these concurrent workloads without the bottlenecks you would hit on the DS725+'s dual-core.

Households with growing storage needs. If you have a few terabytes of photos, videos, documents, and backups today, you will have more tomorrow. Starting with four bays gives you room to grow using SHR, adding larger drives over time without rebuilding your array. A 3-2-1 backup strategy becomes much more practical with four bays.

Anyone who values long-term cost efficiency. The $126-$160 premium over the DS725+ buys you double the bays, double the CPU cores, and dual 2.5GbE. Per bay, the DS925+ costs roughly $249-$257 versus the DS725+'s$980-$1044. That is compelling value.

Who Should Buy the DS725+?

The DS725+ is a solid NAS, but it is the right choice for a narrower set of buyers:

Budget-conscious buyers who genuinely only need two bays. If your total data footprint is under 10-16TB and you do not anticipate significant growth, two bays in RAID 1 may be all you need. The DS725+ does this well at $869.

Single-user households where the NAS primarily serves as a backup target and occasional file server. If you are not running Docker containers, not backing up multiple machines, and not syncing files for a team, the R1600's dual-core is adequate for these lighter workloads.

Apartment dwellers or space-constrained setups where a compact 2-bay form factor matters. The DS725+ is physically smaller (166 x 106 x 223 mm) and lighter than the DS925+.

Do not buy the DS725+ if you are planning to add a DX525 within the first year or two. The DX525 costs $879. For a total of $1,748 you get two native bays plus five expansion bays. The DS925+ at $995 gives you four native bays for $753 less, and you can still add the same DX525 later if needed. The expansion path from the DS725+ is a poor value proposition unless the expansion is genuinely years away.

What About Alternatives?

Synology DS425+ ($819-$899)

The DS425+ offers four bays at a lower price than the DS925+, but with a less powerful Intel Celeron processor and 2GB RAM (versus 4GB ECC). It suits Plex users who want Intel Quick Sync for hardware transcoding, which neither the DS925+ nor DS725+ can do (their AMD CPUs lack a hardware encoder). If media streaming is your primary use case, the DS425+ is actually the better choice. For everything else. Docker, business backup, multi-user file serving. The DS925+ is more capable. Priced at~$980 at Scorptec and $899 at Mwave.

Synology DS225+ ($549-$585)

If you are considering the DS725+ primarily for two bays of basic storage and backup, the DS225+ does the same job for $280-$320 less. It uses an Intel Celeron with 2GB RAM, which is less powerful than the DS725+'s Ryzen R1600 and 4GB ECC, but is perfectly adequate for a personal backup NAS. The DS725+ only makes sense over the DS225+ if you need the extra RAM, ECC memory, or plan to run heavier workloads.

QNAP Alternatives

If the loss of the PCIe expansion slot bothers you. And for some buyers it should. QNAP's equivalent models typically retain 10GbE upgrade options. QNAP's QTS offers more raw capability than DSM, but at the cost of a steeper learning curve and a busier interface. If you are comfortable with more technical NAS administration and want 10GbE upgradeability, QNAP is worth evaluating. If you want simplicity and the most user-friendly NAS experience, Synology remains the safer choice.

Warranty and Where to Buy in Australia

Both the DS925+ and DS725+ come with a standard 3-year warranty from Synology, which can be extended to 5 years. In Australia, your warranty claim goes to the retailer, not Synology directly. Synology has no service centre or phone support in Australia. The standard warranty process runs through the full chain: retailer to distributor (BlueChip or MMT) to Synology in Taiwan, then back again. Expect 2-3 weeks minimum for a resolution.

For the best combination of stock availability and after-sales support, buy from a specialist like Scorptec or PLE. Both carry deep Synology stock and can access distributor inventory when needed. Amazon AU has started holding NAS stock directly in 2026, often at competitive prices, but their support model means you are on your own if the unit fails. They will typically push a credit or refund rather than sourcing a direct replacement, which can leave you with exposed drives and no NAS to put them in.

The Storage Market in 2026: Factor in Drive Costs

Whichever unit you choose, keep in mind that the NAS enclosure is only part of the total cost. HDD and SSD pricing in Australia has increased significantly through 2025-2026. A 4TB NAS drive that cost $149 in early 2025 is now pushing $220 or more. SSD prices have risen even more sharply, and RAM prices have followed suit. Distributors are attempting to secure stock allocations as far forward as 2028, an unprecedented forecasting horizon that signals how constrained the global supply chain has become.

This pricing environment actually favours the DS925+ over the DS725+. With drives being more expensive, maximising usable capacity per drive is more important than ever. Four drives in SHR on the DS925+ give you three drives' worth of usable space. Two drives in RAID 1 on the DS725+ give you only one drive's worth. When each drive costs $300-$500, that difference in storage efficiency is substantial.

Gone are the days of waiting for Black Friday to buy tech. Australian retailers run rolling sale events throughout the year. If you need a NAS now, buy it now. The price will not be dramatically different in six months, and in 2026, the stock might not be there.

The Verdict

The DS925+ is the better NAS for the overwhelming majority of Australian buyers choosing between these two units. For a $126-$160 premium, you get double the bays, double the CPU cores, dual 2.5GbE, and lower power consumption. The per-bay cost is dramatically better, and the storage efficiency advantage of four bays over two bays compounds the value further when you factor in current HDD prices.

The DS725+ suits the buyer who has a genuine, well-defined need for exactly two bays and nothing more. Today and for the foreseeable future. It is a good NAS, but it is not a good stepping stone. If there is any chance you will need more than two bays within the next few years, the DS925+ saves you money in the long run.

If neither of these feels right, read the full Synology NAS lineup ranked for Australian buyers or the broader Best NAS Australia guide for alternatives across all brands and price points.

Use our free NAS Sizing Wizard to get a personalised NAS recommendation.

See also: our complete Synology ecosystem guide.