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Asustor Nimbustor 2 Gen2 AS5402T vs Synology DiskStation DS425+

The Asustor AS5402T is the faster, more flexible box: a newer Celeron N5105, dual 2.5GbE with SMB Multichannel, four M.2 slots and HDMI 4K transcoding. The Synology DS425+ trades raw speed for four drive bays, RAID 5/6 support and Synology's DSM software, which reviewers and owners consistently rate as the easiest NAS platform to live with. Buy the Asustor for a fast two-bay setup with SSD caching and media playback; buy the Synology if you want more bays, better data protection options and a mature app ecosystem.

  • Choose the Asustor AS5402T if you want the quickest two-bay NAS with dual 2.5GbE, four NVMe slots and HDMI media transcoding.
  • Choose the Synology DS425+ if you need four bays, RAID 5 or 6 redundancy and DSM's app library over raw throughput.

Prices

  • Asustor Nimbustor 2 Gen2 AS5402T: $406.99 at eBay (last seen Nov 9)
  • Synology DiskStation DS425+: $579.97 at Amazon (last seen Nov 9)
  • Difference: the Asustor Nimbustor 2 Gen2 AS5402T is $172.98 cheaper than the Synology DiskStation DS425+ at the latest prices (Nov 9)
Asustor
Asustor AS5402T

Asustor Nimbustor 2 Gen2 AS5402T

Asustor AS5402T

5(1 rating)
$406.99at eBayChecked Nov 9
See all prices and details
Visit eBay

Store links may earn us a commission.

Pros
  • Dual 2.5GbE with SMB Multichannel for high aggregate throughput
  • Four M.2 slots allow large SSD cache or all-flash pools
  • HDMI 2.0b with 4K hardware transcoding for direct TV playback
  • 4 GB RAM out of the box, upgradeable to 16 GB
  • Three USB 3.2 Gen 2 ports at 10 Gbps
Cons
  • Only two drive bays, so RAID 5 and RAID 6 are unavailable
  • ADM app catalog is smaller than Synology's
  • No hot-swap claim for the drive trays
  • Celeron N5105 is capable but not a powerhouse for heavy virtualization
Synology
Synology 4-bay DiskStation DS425+ (Diskless)

Synology DiskStation DS425+

Synology 4-bay DiskStation DS425+ (Diskless)

4.8(6 ratings)
$579.97at AmazonChecked Nov 9
See all prices and details
Visit Amazon

As an Amazon Associate, Deal.ai earns from qualifying purchases.

Pros
  • Four bays enable RAID 5 or RAID 6 with single- or double-drive fault tolerance
  • Hot-swappable trays simplify drive replacement
  • DSM is the most polished consumer NAS OS, with strong backup and photo apps
  • One 2.5GbE port gives a fast link without an add-in card
  • Compact 2.18 kg chassis for its bay count
Cons
  • 2 GB RAM and a 6 GB ceiling limit Docker and VM use
  • Celeron J4125 is older and slower than the N5105
  • Only one 2.5GbE port; the second LAN is 1GbE
  • No HDMI output, so no direct 4K playback or transcoding to a TV

What separates them

Asustor Nimbustor 2 Gen2 AS5402TSynology DiskStation DS425+
Drive bays2 bays (3.5in or 2.5in)4 bays (3.5in or 2.5in), hot-swappable
CPUIntel Celeron N5105, quad-core, 2.0 GHz base / 2.9 GHz burst, 10 nmIntel Celeron J4125, quad-core, 2.0 GHz base / 2.7 GHz turbo
RAM4 GB DDR4-2933, upgradeable to 16 GB2 GB DDR4 non-ECC, maximum 6 GB
Network2 x 2.5GbE with SMB Multichannel1 x 2.5GbE plus 1 x 1GbE
M.2 NVMe slots4 slots, tool-free, with thermal vents2 slots (2280)
RAID levelsRAID 0, 1, 10, JBODRAID 0, 1, 5, 6, 10
Video outputHDMI 2.0b with 10-bit 4K hardware decodingNone
Software ecosystemADM, Linux-based, smaller app catalogDSM, widely praised for ease of use and app breadth

Price history

  • Asustor Nimbustor 2 Gen2 AS5402T: lowest $406.99 on Nov 9 at Best Buy.
  • Synology DiskStation DS425+: lowest $579.97 on Nov 9 at Amazon.

Prices at every store

Asustor Nimbustor 2 Gen2 AS5402T

  • eBayNew

    In stockSold by aaawavecom (99.7% positive, 32,786 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $406.99Free shippingChecked Nov 9
    Visit eBay
  • WalmartNew

    In stockSold by DealClockReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $406.99Free shippingChecked Nov 9
    Visit Walmart
  • Best BuyNew

    In stock

    $406.99Free shippingChecked Nov 9
    Visit Best Buy
  • NeweggNew

    In stock

    $406.99Free shippingChecked Nov 9
    Visit Newegg

Store links may earn us a commission. Some prices via Klarna.

All 5 stores and price history →

Synology DiskStation DS425+

  • WalmartNew

    In stockSold by Newegg Inc.Returns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $589.99Free shippingChecked Nov 9
    Visit Walmart
  • Best BuyNew

    In stock

    $599.99Free shippingChecked Nov 9
    Visit Best Buy
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $579.97Free shippingChecked Nov 9
    Visit Amazon
  • B&H Photo-Video-AudioNew

    Availability unknown

    $579.99Checked Nov 9
    Visit B&H Photo-Video-Audio

Also available at

  • eBayCheck price at eBay
  • WalmartCheck price at Walmart

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All 12 stores and price history →

Specs compared

SpecAsustor Nimbustor 2 Gen2 AS5402TSynology DiskStation DS425+
Drive bays2 front bays (no drives included); supports HDD…4 × 3.5" SATA HDD or 2.5" SATA SSD
M.2 slotsFour NVMe M.2 slots (tool-free installation)2 × M.2 2280 NVMe SSD
Weight1.71 kg2.18 kg
Dimensions170 (H) x 114 (W) x 230 (D) mm166 mm × 199 mm × 223 mm
Memory4 GB DDR4-2933 (user-upgradeable to 16 GB)—
NetworkDual 2.5GbE LAN with SMB Multichannel support—
USBUSB 3.2 Gen 2 (10 Gbps)—
Video outputHDMI 2.0b with 10-bit 4K hardware decoding—
Operating systemADM (Linux-based)—
ColourBlack—
Flash memory8GB eMMC—
Processor CoresQuad Core—
Show all 37 specsShow fewer specs
SpecAsustor Nimbustor 2 Gen2 AS5402TSynology DiskStation DS425+
Built-In Hard DriveNo—
Form Factor2.5", 3.5"—
EthernetYes—
Processor Speed (GHz)2.9—
USB-AYes—
RAIDYes—
SATAYes—
RAID LevelsRAID 10, RAID 0, RAID 1, JBOD—
RAM4 GB, 8 GB—
size—N/A

What reviewers say

Asustor Nimbustor 2 Gen2 AS5402T

Owners and reviewers treat the AS5402T as one of the faster two-bay NAS units in its class, mainly for its 2.5GbE networking and four M.2 slots. Praise centers on build quality, quiet running and smooth 4K transcoding, while complaints focus on the diskless package and the smaller app library.

What people mention
  • Network speedPraisedOwners report large file transfers finishing much faster over 2.5GbE than on gigabit-only NAS units.
  • M.2 slotsPraisedReviewers like having four NVMe slots for cache or SSD volumes without sacrificing the hard drive bays.
  • NoisePraisedUsers describe it as quiet in normal operation, helped by the vented M.2 thermal design.
  • App ecosystemCriticisedSome owners say ADM has fewer third-party apps than Synology's DSM.

Synology DiskStation DS425+

Owners of the DS425+ line praise the build, the DSM software and the jump to 2.5GbE networking. Many say the stock 2 GB of RAM is the first thing to upgrade, and some find the Celeron limits heavier virtualization and transcoding.

What people mention
  • MemoryCriticisedOwners say 2 GB of RAM is tight and often upgrade to the 6 GB maximum early.
  • SoftwarePraisedDSM is called polished and easy to set up, with a wide app catalog.
  • Network speedPraisedThe 2.5GbE port is reported to make large file transfers much faster than 1GbE.
  • ProcessorMixedThe Celeron J4125 handles file serving and backups well but feels slow for virtualization and transcoding.

Questions and answers

Which is better for Plex and 4K streaming?
The Asustor. Its HDMI 2.0b port and 10-bit 4K hardware decoding let it output straight to a TV, and the N5105 transcodes more formats. The DS425+ has no video output and relies on software transcoding over the network.
Which holds more usable storage?
The Synology, because four bays accept four large drives. With two bays the Asustor tops out lower unless you lean on its four M.2 slots for flash storage.
Is the DS425+ worth stepping up to over the Asustor?
If data protection matters more than speed, yes. RAID 5 and RAID 6 on four bays survive a drive failure without halving capacity, which a two-bay RAID 1 cannot match.
Which is faster over the network?
The Asustor on paper: two 2.5GbE ports with SMB Multichannel can exceed a single 2.5GbE link. The DS425+ has one 2.5GbE port, so it caps at roughly that speed.
Can both run Docker containers?
Yes, but the Asustor has more headroom with 4 GB standard and a 16 GB ceiling. The DS425+ starts at 2 GB and maxes out at 6 GB, which limits heavier containers.
Which is easier for a first-time NAS owner?
The Synology. DSM's setup wizard, backup tools and mobile apps are widely regarded as the simplest in the category. ADM is capable but has a steeper learning curve and fewer guides.

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RAID Level
—
RAID 0, RAID 1, RAID 5, RAID 6, RAID 1+0
Without Hard Drive—Yes
Hot Swappable—Yes
Type—NAS
Network Connectivity—Gigabit Ethernet, 10/100 Ethernet
Personal Cloud Storage—Yes
Installed RAM—2 GB RAM
CPU model—Intel Celeron J4125
CPU cores—4
CPU frequency—2.0 (base) / 2.7 (turbo) GHz
System memory—2 GB DDR4 non-ECC
Maximum memory—6 GB (2 GB + 4 GB)
1GbE LAN ports—1
2.5GbE LAN ports—1
USB ports—2