Synology · NAS buying guide
Synology DS425+ · Exact identity: DS425+
4 primary bays · Intel Celeron J4125 · 4-core · 2GB DDR4 · max 6GB · 1 × 2.5GbE + 1 × 1GbE · Diskless: hard drives cost extra
Catalog amount: $589 · recent · Price record: 2026-10-09T03:59:21.369798+00:00. Tax and shipping excluded.
Price observed at the store on the shown date. Confirm the current price and availability at the store.
DS425+: specifications and dated store comparison →Four bays for backups, photos and faster everyday file copies
Diskless enclosure with 2GB RAM. Storage drives and the optional memory upgrade are separate purchases.
The DS425+ is the 2025 four-bay Plus refresh of the J4125 platform with one 2.5GbE port. This page uses Synology’s current tables, ComputerBase and PCMag file copies, TostieTech’s mixed-drive 2.5GbE test, and How-To Geek’s install notes. ChooseCompute has not tested it. DSM 7.3 widened third-party SATA HDDs; M.2 pools/cache stay list-bound. Intel graphics is not a supported Plex hardware-transcode feature. See the review evidence ↓
The four-bay layout and DSM tools suit shared storage; a suitable 2.5GbE network helps large copies.[1][3]
Facial recognition is supported, but object recognition needs at least 4GB. This model ships with 2GB.[1]
Compatible SSDs can cache data or form pools. One reviewer saw little cache benefit for large transfers.[1][4]
Official hardware transcoding is not available as assumed from the Intel CPU; community modifications are separate.[5]
Follow any specification for its full conditions and sources.
Living with it
ComputerBase’s four-drive RAID 5 test reached about 260 MB/s writes and 280 MB/s reads for a large file on the single 2.5GbE port. PCMag copied a 4.9 GB mixed folder at 282 MB/s read and write with four Synology 4TB Plus drives in SHR. A Gigabit computer or switch still limits the connection. SSD cache did not raise sequential copies in TostieTech’s pass.[3][13][4]
The base 2GB handles a different workload from an upgraded system. Photos object recognition needs at least 4GB, while vendor application ceilings often assume maximum memory.[1]
Compatible SSDs can form storage pools or cache. TostieTech saw little change in its read-only-cache transfer comparison; ComputerBase’s warmed read/write cache improved encrypted-folder reads while ordinary copies barely changed. Buy for your workload and supported SSD list.[1][4][3]
Our buying advice combines official specifications with the original reviews below. We have not tested this product ourselves. Expand a review for its setup, measurements and limitations.
Frank HüberOct 20, 2025
Four HAT5310-20T HDDs in RAID 5 on the single 2.5GbE port: 5.9 GB CIFS write/read 259.51 / 280.03 MB/s. Encrypted 15 GB folder write/read 153.65 / 172.95 MB/s. SSD cache did not lift sequential CDM beyond the 2.5GbE ceiling.
Read the original reviewSynology DS425+ NAS im Test: Übertragungsraten und Backup
Updated Oct 22, 2025
Tested: Four HAT5310-20T 20 TB HDDs in RAID 5 with stock 2 GB RAM; one 2.5GbE port, plus separate multi-client aggregation with the 1GbE port. Two SNV3410-400G SSDs formed RAID 1 read/write cache. Benchmarks predate DSM 7.3; the later installation and policy retest is separate.
Applies to: Large-file, encrypted-folder and USB backup evidence.
| Measurement | Result | Conditions & source location |
|---|---|---|
| 5.9GB CIFS file write / read | 259.51 / 280.03 MB/s | Four 20TB HAT5310 HDDs in RAID 5; one 2.5GbE port.CIFS-Dateitransfer – Datei |
| 15GB encrypted-folder write / read | 153.65 / 172.95 MB/s | AES-256 shared-folder encryption; same RAID 5 setup.AES-256-Verschlüsselung – Ordner |
| 15 GB, approximately 4,000 files write / read | 191.18 / 223.86 MB/s | Single 2.5GbE, four 20 TB HDDs in RAID 5.Page 2, CIFS folder charts |
| Encrypted 5.9 GB file write / read | 265.10 / 277.34 MB/s | AES-256 shared-folder encryption; same RAID 5.Page 2, AES-256 file charts |
| Multi-client aggregate file / folder write and read | File 261.30 / 293.37 MB/s; folder 228.95 / 247.94 MB/s | Mixed 2.5GbE and 1GbE link aggregation raised a link-speed warning; not a guaranteed 3.5Gb/s single-client connection.Page 2, Link Aggregation |
| Warm-cache file / folder write and read | File 258.99 / 275.75 MB/s; folder 190.95 / 224.62 MB/s | Repeated copies with two SNV3410-400G SSDs in RAID 1 read/write cache.Page 3, SSD cache CIFS charts |
| Warm-cache encrypted file / folder write and read | File 262.45 / 273.57 MB/s; folder 160.94 / 216.39 MB/s | Same warmed cache; compare encrypted folder without cache at 153.65 / 172.95 MB/s.Page 3, cache AES-256 charts |
| USB 25 GB transfer time | 1 min 13 s write; 1 min 15 s read | Separate USB backup workload.Page 2, USB-Backup |
| Hibernation / idle / file-write power | 5.9 / 26.7 / 44.3 W | Four HDD test configuration, separate from manufacturer ratings.Page 3, Leistungsaufnahme |
| Idle / access noise | 34.6 / 35.9 dB(A), as chart labels | Microphone distance and calibration unstated; qualitative fan report describes quiet operation without rattling.Page 3, Lautstärke |
Limits to keep in mind
JosSep 4, 2026
Windows copy screenshots show 261 MB/s plain and 156 MB/s encrypted writing at different progress points, not full-transfer averages. A separate read-only-cache comparison records read/write of 271/262 MB/s without cache and 271/260 MB/s with cache; warm-up details are missing.
Read the original reviewSynology DS425+ review: 4-bay NAS met 2,5GbE getest
Tested: Three HAT3300-4T 4 TB HDDs plus a WD60EFPX-68C5ZN0 6 TB HDD and SNV3410-400G SSD; stock 2 GB described. Windows client with 10GbE-capable infrastructure, NAS at 2.5GbE. A setup wizard selects SHR but does not show a completed pool; exact final RAID and running DSM build remain unproven. Cache screenshots select read-only cache. Power test uses four HDDs and one SSD.
Applies to: Recent mixed-drive file-copy and cache observations.
| Measurement | Result | Conditions & source location |
|---|---|---|
| Windows copy, plain / encrypted write | 261 / 156 MB/s | Same large file; screenshot observations, not sustained averages; RAID not stated.Windows Verkenner |
| No-cache / cache read and write | 271/262 versus 271/260 MB/s | Reviewer’s stated cache comparison; exact cache warm-up and workload details absent.SSD-cache |
| SMB CrystalDiskMark sequential read / write | Q8T1 295.66 / 278.73 MB/s; Q1T1 176.54 / 171.24 MB/s | CrystalDiskMark 9.0.3 x64, three passes, 1 GiB, volume 6% used; SEQ1M workload.SMB-Crystal-Disk-Mark image |
| SMB CrystalDiskMark random 4K read / write | Q32T1 120.50 / 27.27 MB/s; Q1T1 9.81 / 0.01 MB/s | Same three-pass 1 GiB test; separate from sequential throughput.SMB-Crystal-Disk-Mark image |
| iSCSI CrystalDiskMark sequential read / write | Q8T1 295.07 / 232.34 MB/s; Q1T1 235.24 / 225.63 MB/s | CrystalDiskMark 9.0.3 x64, three passes, 1 GiB, separate 500 GiB target.iSCSI-Crystal-Disk-Mark image |
| iSCSI CrystalDiskMark random 4K read / write | Q32T1 204.01 / 0.42 MB/s; Q1T1 12.15 / 0.01 MB/s | Same 500 GiB target and 1 GiB test.iSCSI-Crystal-Disk-Mark image |
| Idle / loaded system power | 30.7 / 44.2 W | Four HDDs and one NVMe SSD; whole-system measurements. Subtracting nameplate drive watts does not measure an empty enclosure.Power section |
| Author noise observations | Approximately 37 dB idle / 43 dB load | Phone app, about 10 cm in front; image selects Z weighting, not A. Calibration and ambient noise unknown; not a controlled dB(A) comparison.Noise prose and phone screenshot |
| Reported HDD / NVMe temperatures | HDD 31 / 33 °C idle/load; NVMe 35 / 35 °C | Ambient conditions and sensor mapping incomplete.Temperature section |
Limits to keep in mind
Jordan GloorAug 28, 2025
The two 4 TB drive installation and DSM setup were straightforward, with Android Photos backups, Linux Drive, DLNA/NFS and TV streaming tried over a couple of weeks. The official Drive DEB failed on Kubuntu; an unofficial Flatpak worked. A later editor note states that the certified-HDD requirement was reversed.
Read the original reviewSynology DS425+ Review: Enjoyable Experience, Frustrating Restrictions
Tested: Hands-on DS425+ with two Synology 4TB HDDs; RAID type configured but not named; Photos and Drive set up on Android and Linux. Factory 2 GB described. No throughput table.
Applies to: Exact enclosure qualitative setup and launch-era SATA lock-in. An editor note after publication records that Synology no longer requires certified HDDs. Not a speed test.
Limits to keep in mind
John R. DelaneyNov 11, 2025
A 4.9 GB mixed music/video/photo/office folder copied at 282 MB/s write and 282 MB/s read versus the desktop PC over 2.5GbE.
Read the original reviewSynology DiskStation DS425+ Review
Tested: Four Synology 4TB Plus Series HDDs supplied for testing; SHR on Btrfs after >6 hours optimize; 2.5GbE switch to a desktop PC. Score 3.5 / Good.
Applies to: Exact enclosure mixed-folder copies on 2.5GbE. M.2 third-party limitation is a software/policy point, not a measured NVMe result.
| Measurement | Result | Conditions & source location |
|---|---|---|
| 4.9 GB mixed-folder copy | 282 MB/s write and 282 MB/s read | SHR, Btrfs, four Synology 4TB Plus, 2.5GbE to desktop. PCMag reports MBps.Setup and Performance |
Limits to keep in mind
Aug 10, 2025
Setup screenshots confirm stock 2 GB and four-drive SHR. An idle-memory frame shows 28% usage; this is a short observation, not application-capacity testing.
Read the original reviewSynology DS425+ NAS Review — SHOULD YOU BUY?
Tested: Embedded setup frames show DS425+, DSM 7.2.2-72806 Update 3, 2 GB RAM and four 4 TB HDDs in SHR with Btrfs. Exact drive MPNs are not visible. Archived article dated August 15, 2025; original audio/video not reviewed.
Applies to: Exact enclosure acoustic notes. 28.25 W / 6.10 W sentences repeat Synology’s access/hibernation ratings and are not adopted as independent watts.
| Measurement | Result | Conditions & source location |
|---|---|---|
| Phone noise readings | 42.2 / 37.9 / 37.6 / 52.7 dB in four frames | Individual states unlabeled; prose approximates 36–38 dB idle and 53 dB peak. Distance, calibration and weighting unverified.Noise collage |
| Power-meter readings | 6.1 / 25.5 / 44.0 / 37.2 W | Four unlabelled states; do not assign idle/hibernation from values alone.Power collage |
| Thermal-camera surface readings | Front 32.8 °C; side 35.8 and 39.2 °C; PSU 33.5 °C | Surface observations, not internal drive temperatures; ambient unstated.Thermal collage |
Limits to keep in mind
Examples ordered by recorded drive unit price, which may be historical or an editorial reference. Check capacity, vendor compatibility, included storage and price evidence before choosing. These are component checks, not compatibility certifications.
Component total: $898.98 · historical · Oldest price record: 2026-10-09T01:23:41.974420+00:00 · 4TB raw, before redundancy.
Historical price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:59:21.369798+00:00; drive price record: 2026-10-09T01:23:41.974420+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Historical price observation. Recheck the price and availability before buying; this is not a current offer. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.
Component total: $968.98 · recent · Oldest price record: 2026-10-09T03:58:24.994342+00:00 · 8TB raw, before redundancy.
Dated price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:59:21.369798+00:00; drive price record: 2026-10-09T03:58:24.994342+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Price observed at the store on the shown date. Confirm the current price and availability at the store. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.
Component total: $978.98 · historical · Oldest price record: 2026-09-27T13:58:17.239646+00:00 · 8TB raw, before redundancy.
Historical price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:59:21.369798+00:00; drive price record: 2026-09-27T13:58:17.239646+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Historical price observation. Recheck the price and availability before buying; this is not a current offer. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.
Component total: $1,208.96 · historical · Oldest price record: 2026-10-09T01:23:41.974420+00:00 · 8TB raw, before redundancy.
Historical price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:59:21.369798+00:00; drive price record: 2026-10-09T01:23:41.974420+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Historical price observation. Recheck the price and availability before buying; this is not a current offer. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.
Component total: $1,348.96 · recent · Oldest price record: 2026-10-09T03:58:24.994342+00:00 · 16TB raw, before redundancy.
Dated price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:59:21.369798+00:00; drive price record: 2026-10-09T03:58:24.994342+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Price observed at the store on the shown date. Confirm the current price and availability at the store. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.
Before you buy
Add SATA drives and a separate backup destination. RAID redundancy does not replace an independent backup.[1]
Photos object recognition requires more than the supplied 2GB. Official expansion is one 4GB module, for 6GB total.[1]
M.2 pools require verified SSDs and cache remains compatibility-listed; buy NVMe for a defined workload.[1][2]
The full specifications retain manufacturer test conditions. Some application limits use maximum supported RAM or SSD volumes; extra RAM, SSDs and licenses can add to the enclosure cost.[9]
Diskless enclosure with 2GB RAM. Storage drives and the optional memory upgrade are separate purchases. Check the total delivered price at the store.
Lowest observed price
$589
In stock at observation
Currency not confirmed
6 stores · 1 recent price observation
Sold by RockyStone Electronics
$589
Observed price
Currency not confirmed
In stock at observation · Condition not recorded
Observed Oct 9, 2026, 3:59:21 AM UTC[18]
View exact product at AmazonSold by B&H Photo Video
$599.99
Historical price
Stock not confirmed · New
Diskless enclosure; factory 2GB
Free Expedited Shipping Before tax; no Payboo tax/financing benefit deducted. Destination/export restrictions apply.
Observed Sep 8, 2026, 3:37:27 PM UTC[6]
View exact product at B&H Photo VideoSold by Newegg
$599.99
Historical price
Stock not confirmed · New
DS425+; factory configuration; diskless enclosure
Observed shipping: $0.00
Observed Oct 9, 2026, 1:18:55 AM UTC[15]
View exact product at NeweggSold by Tech Deal
$599.99
Historical price
Currency not confirmed
Stock not confirmed · Condition not recorded
Observed Sep 26, 2026, 8:18:44 AM UTC[16]
View exact product at Best BuySeller not recorded
$599.99
Historical price
Currency not confirmed
Stock not confirmed · Condition not recorded
Observed Sep 27, 2026, 4:13:25 AM UTC[17]
View exact product at AdoramaSeller not recorded
$599.99
Historical price
Currency not confirmed
Stock not confirmed · Condition not recorded
Observed Sep 27, 2026, 5:25:51 AM UTC[19]
View exact product at B&HPrices are dated observations. Confirm the model, seller, condition, stock and delivered total at the store. Older prices remain visible as history. Links may earn a commission.
No. This page covers the empty four-bay enclosure with factory 2GB RAM.[1]
Photos and facial recognition are supported, but object recognition needs at least 4GB. The official 4GB upgrade module brings the total to 6GB.[1]
There is no network upgrade slot or expansion-unit port. Capacity growth stays within the four SATA bays; the two compatible M.2 slots are a separate storage option.[1]
Do not assume it from the Intel CPU. Blackvoid documents missing official support on DS425+ and a community workaround; the latter is not part of this supported purchase configuration.[5]
Research updated Sep 11, 2026. Individual source check dates are listed below. Measurements belong to the named reviewers; tested configurations and software versions may differ from the product you buy.
Checked Sep 11, 2026 · Hardware + DSM tables
Checked Sep 11, 2026 · FAQ 2: 2025 Plus HDDs broader; M.2 still listed
Checked Sep 11, 2026 · Pages 1–3; update 2025-10-20
Checked Sep 11, 2026 · Windows copy, CDM, cache table
Checked Sep 11, 2026 · Community modification; not a factory-supported feature
Checked Sep 8, 2026 · Main new buy box; MPN; diskless configuration; seller and stock
Checked Sep 8, 2026 · Main new buy box; MPN; diskless configuration; seller and stock
Checked Sep 8, 2026 · MFR DS425+, diskless title and 2GB specification; buy-box price/stock not exposed
Checked Sep 11, 2026 · J4125; 2 GB / max 6 GB; 1×2.5GbE + 1×1GbE; 90 W; 21.6 dB(A)
Checked Sep 10, 2026 · Selected buy-box seller; Product information model; New offers. MAP-hidden main price is not inferred from other sellers or recommendations.
Checked Sep 11, 2026 · Item N82E16822108849; $599.99; Sold by Newegg / Shipped by Newegg
Checked Sep 11, 2026 · Jordan Gloor 2025-08-28 plus editor HDD-policy note
Checked Sep 11, 2026 · 4.9 GB mixed folder 282/282 MB/s
Checked Sep 11, 2026 · Wayback 2025-08-15 body; live 403
Checked Oct 9, 2026 · newegg-main-item; sha256:2d3cb98857abefe9e7bab2d638a410f10435852cc387bdee8e177f02742f28cb
Checked Sep 26, 2026 · Captured observation; sha256:895ffdeea5dcd22b66304fb76ca7a7170f5c316d50e764ecfe71a6f455252f5e
Checked Sep 27, 2026 · Captured observation; sha256:0c2601b55b2f962b6d4133ccbdd6e67f8d1d97f75ab5e4f0cee9568766c5c63c
Checked Oct 9, 2026 · Captured observation; sha256:8b172347470f3b6c0384f642b64f8c2b09ddfd266e60fa15b9848aa80b5b8f92
Checked Sep 27, 2026 · Captured observation; sha256:83b68bb06dfbca012f503fc1983277df4e67545fe4e1346fedd884f8f3e4573d
Independent review completed for the scope recorded in the audit.
Source evidence and review history (JSON)