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QNAP TS-251D-4G 2-Bay NAS, Intel Celeron Dual-Core, 4GB DDR4, Gigabit LAN, HDMI 2.0, PCIe Slot

Price:

$ 559.88


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QNAP TS-251D-4G 2-Bay NAS, Intel Celeron Dual-Core, 4GB DDR4, Gigabit LAN, HDMI 2.0, PCIe Slot

https://arcip.com.au/web/image/product.template/11531/image_1920?unique=874d354

QNAP TS-251D-4G 2-bay tower NAS. Intel Celeron J4025/J4005 2-core processor (burst up to 2.9/2.7 GHz) with AES-NI, 4GB SODIMM DDR4 (max 8GB). 2 x 3.5-inch SATA 6Gb/s bays, drives not included. 1 x Gigabit Ethernet, 1 x PCIe Gen 2 x4 slot for 10GbE or M.2 cards, 1 x HDMI 2.0, 2 x USB 3.2 Gen 1, 3 x USB 2.0. 4K hardware decoding and real-time transcoding, snapshots, QuMagie, Qsync and QVR Pro. 2-year warranty, extendable up to 5 years. Genuine QNAP from ARC IP Networks, authorised QNAP reseller with Australian stock.

$ 559.88 559.88 AUD $ 559.88 incl. GST

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    Authorised Australian Reseller | Australian Stock | Genuine Local Warranty

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SKU
TS-251D-4G
Barcode
4713213516676

QNAP TS-251D-4G at a glance

The QNAP TS-251D-4G is a 2-bay tower NAS with an Intel Celeron J4025/J4005 dual-core processor, 4GB DDR4 RAM (expandable to 8GB), one Gigabit Ethernet port and an HDMI 2.0 output. A PCIe Gen 2 x4 slot adds 10GbE, M.2 SSD caching or Wi-Fi, and the integrated graphics support 4K hardware decoding and real-time transcoding.

ARC IP Networks is an authorised QNAP reseller in Australia. We supply the genuine QNAP TS-251D-4G from Australian stock, with a GST tax invoice on every order.

Drive bays2 x 3.5-inch SATA
CPUCeleron dual-core
Memory4GB DDR4 (max 8GB)
VideoHDMI 2.0, 4K transcoding

Best for

  • Home multimedia streaming and 4K playback on an HDTV
  • File sharing, sync and snapshot-protected backup for small offices
  • Surveillance storage with QVR Pro

Key features

Intel Celeron J4025/J4005 2-core/2-thread processor, burst up to 2.9/2.7 GHz, with AES-NI encryption.

4GB SODIMM DDR4, expandable to 8GB (2 x 4GB).

Two 3.5-inch SATA 6Gb/s bays that also accept 2.5-inch SATA SSDs.

PCIe Gen 2 x4 slot for QM2 M.2 SSD caching/10GbE cards, network cards or a wireless adapter.

HDMI 2.0 output with dual-channel 4K hardware decoding and real-time transcoding.

One Gigabit Ethernet port, two USB 3.2 Gen 1 and three USB 2.0 ports.

Block-based snapshots: up to 256 per volume or LUN and 1,024 per NAS.

QuMagie AI photo management, Qsync, File Station and QVR Pro.

IR sensor for the optional QNAP RM-IR004 remote control.

QNAP TS-251D-4G specifications

QNAP TS-251D-4G technical specifications
SpecificationValue
Processor and memory
CPUIntel Celeron J4025/J4005 2-core/2-thread, burst up to 2.9/2.7 GHz
Architecture64-bit x86
GraphicsIntel HD Graphics 600
Encryption engineAES-NI
Hardware-accelerated transcodingYes
System memory4 GB SODIMM DDR4
Maximum memory8 GB (2 x 4GB)
Memory slots2 x SODIMM DDR4 (dual-DIMM requires identical pair)
Flash memory4GB (dual boot OS protection)
Storage
Drive bays2 x 3.5-inch SATA 6Gb/s, 3Gb/s (shipped without drives)
Drive compatibility3.5-inch SATA HDD; 2.5-inch SATA SSD
Hot-swappableYes (not M.2 SSD)
M.2 slotOptional via a QM2 PCIe adapter
SSD cache accelerationYes
Networking
Gigabit Ethernet (RJ45)1
5GbE / 10GbEExpandable with an optional PCIe adapter
Wake on LANYes
Jumbo frameYes
Expansion and I/O
PCIe slot1 x PCIe Gen 2 x4 (bandwidth limits NAS 10GbE performance)
PCIe card dimensions190 x 68.9 x 18.76 mm
USB 3.2 Gen 12
USB 2.03
USB 3.2 Gen 2Optional via a PCIe expansion card
HDMI output1, HDMI 2.0
IR sensorYes (optional QNAP RM-IR004 remote)
Physical
Form factorTower
Dimensions (HxWxD)168 × 105 × 226 mm
LED indicatorsPower/Status, LAN, USB, HDD1-2
ButtonsPower, USB copy, Reset
Fan1 x 70mm
Kensington security slotYes
Power and environment
Power supply65W adapter (12VDC), 100-240VAC
Power consumption (disk standby)8.08 W
Power consumption (operating, typical)15.25 W, tested with drives fully populated
Operating temperature0 - 40 °C
Storage temperature-20 - 70 °C
Relative humidity5-95% RH non-condensing
Warranty and limits
Standard warranty2 years
Max concurrent CIFS connections (max memory)1500

Figures from QNAP's official product page and hardware specifications.

The QNAP TS-251D-4G in depth

Celeron performance with AES-NI

The TS-251D combines an Intel Celeron dual-core processor, DDR4 memory up to 8GB, Gigabit LAN and SATA 6Gb/s drive support, with AES-NI 256 hardware-accelerated encryption for full volumes and shared folders.

4K multimedia

Integrated Intel graphics provide dual-channel 4K hardware decoding and real-time transcoding, so videos can be converted for playback on other devices or watched on an HDTV over HDMI. Multimedia Console, Cinema28, Qmedia and QuMagie AI photo albums round out the media features.

Expand with PCIe

The PCIe Gen 2 x4 slot accepts a QNAP QM2 card for M.2 SSD caching or 10GbE with Qtier tiered storage, or a compatible wireless adapter to turn the NAS into an access point. Storage can grow with TR-002 or TR-004 enclosures, VJBOD or online RAID capacity upgrades.

Frequently asked questions

Straight answers about the QNAP TS-251D-4G from the ARC IP Networks team. Last reviewed October 2026.

QNAP's TS-251D-4G specification lists an Intel Celeron J4025/J4005 2-core/2-thread processor with burst up to 2.9/2.7 GHz; the J4025 is 2.0 GHz base.

Yes. 5GbE or 10GbE is available via an optional adapter in the PCIe Gen 2 x4 slot, though PCIe bandwidth limits restrict 10GbE performance.

It ships with 4GB SODIMM DDR4 and supports up to 8GB (2 x 4GB) using an identical pair of modules.

Yes. It has one HDMI 2.0 output for watching 4K media on an HDTV.

It is backed by a 2-year warranty, and QNAP offers warranty extensions up to 5 years.

ARC IP Networks is an authorised QNAP reseller and supplies the TS-251D-4G from Australian stock with a GST tax invoice.

Explore the full QNAP range: Shop all QNAP

Buy the QNAP TS-251D-4G in Australia

ARC IP Networks is an authorised QNAP reseller, supplying QNAP NAS, expansion units, switches and network cards to businesses, creative studios, integrators and home users across Australia.

  • Genuine QNAP: sourced through QNAP's authorised Australian distribution, never grey import.
  • Australian stock, shipped Australia-wide.
  • Manufacturer's warranty and local pre-sales help choosing the right model.
  • GST tax invoice on every order, with trade and project pricing available.

Planning QNAP storage?

Ask ARC IP Networks for project pricing or a configured quote, or call us to check the right QNAP model for your data.

Brand QNAP

Accurate Shipping Costs

Our online shipping calculator is designed to provide a final, accurate shipping cost based on the items in your cart and your delivery postcode. Shipping costs are calculated at checkout based on your order and delivery postcode. The final cost is calculated based on several factors which are automatically accounted for by our system, including:

  • The stock location of the item(s) across our warehouses.
  • Orders with multiple items that may require special packaging.
  • The weight and dimensions of the order (including heavy or oversized items).
  • The delivery courier servicing your specific region.

Delivery Times


 

Standard Processing


Most orders placed by 2pm AEDT are dispatched for next working day delivery. Larger orders may require 1-2 additional business days for processing. If timing is critical, please contact us to discuss expedited options (additional charges may apply).


Delivery Timeframes


Region

Processing Time

Express Delivery

Standard Delivery

VIC, NSW, SA, QLD Metro, TAS

1-2 business days

1-2 business days

2-4 business days

NT, WA, QLD Rural

1-2 business days

1-2 business days

3-5 business days

New Zealand

1-2 business days

2-3 business days

4-10 business days

Please note: Processing times may extend during peak periods such as Christmas and end of financial year.

Free Warehouse Pickup



Save on shipping costs with free pickup from our ARC IP Networks Blackburn warehouse. Simply place your order online or by phone, and collect during business hours (Monday to Friday). Please allow time for picking and packing. For urgent orders, call 1300 100 440 to confirm your order is ready.

ARC IP Networks Pickup Address: 6 George Street, Blackburn, VIC 3130


Insurance & Tracking



All ARC IP Networks shipments are fully insured and trackable. Once dispatched, you'll receive an email with your tracking number and courier website details. If your item is confirmed lost or damaged by our courier, we'll arrange a replacement in consultation with you.


International Shipping



ARC IP Networks ships to New Zealand. Please note:


  • Import duties and taxes vary by country
  • Buyers are responsible for all customs charges
  • Contact your local customs authority before ordering
  • We'll provide required documentation for smooth customs clearance
  • Buyers cover all shipping costs for returns due to refused duties/taxes


Delivery Requirements


Signature Required


All deliveries must be signed for. If you won't be home, contact our Sales Support team to arrange Authority to Leave. Important: Authority to Leave voids shipping insurance if parcels are lost or stolen.


Delivery Restrictions


We do not deliver to PO Boxes or Parcel Lockers as our couriers cannot access them. Orders sent to these addresses will be returned, incurring redelivery fees.


Shipping Issue Resolution


ARC IP Networks works closely with our shipping partners to resolve any delivery issues quickly and fairly:


  1. Confirmation: We verify expected delivery dates with our shipping partners
  2. Investigation: Issues outside normal timeframes trigger formal investigations
  3. Communication: We keep you updated throughout the resolution process
  4. Resolution: Confirmed lost items are replaced or refunded after investigation completion


Please note: Refunds for lost, missing, or delayed orders cannot be processed until shipping partner investigations are complete. This does not affect your rights under the Australian Consumer Law, and refunds or replacements will be provided where required once loss or damage is confirmed.

Warranty & Faulty Products

ARC IP Networks complies with the Australian Consumer Law (ACL).

If a product is faulty, damaged, not of acceptable quality, or does not perform as advertised, you are entitled to a repair, replacement, or refund in accordance with ACL.

Manufacturer Warranty Returns

For faults developing after 14 days within the warranty period:

  • Contact ARC IP Networks first at info@arcip.com.au or 1300 100 440
  • We will assess the issue and coordinate with manufacturers, authorised service centres, or distributors on your behalf
  • Where required, a manufacturer RMA may be arranged
  • ARC IP Networks manages the return process and next steps

Dead on Arrival (DOA)

Products that arrive faulty or damaged must be reported within 14 days of delivery.

ARC IP Networks will arrange assessment, replacement, or refund as appropriate.

Change of Mind & Non-Faulty Returns

Change-of-mind returns must be requested within 14 days of delivery. For change-of-mind returns, the product must be unused, unopened, in its original packaging, and returned with all accessories and documentation. These conditions apply only to change-of-mind returns and do not limit or exclude your rights under the Australian Consumer Law. Some products are not eligible for change-of-mind returns, including:

  • Ex-demo products
  • Clearance or markdown items
  • Special-order items
  • Products clearly marked “No Change-of-Mind Returns”

Important

This does not affect your rights under Australian Consumer Law.

If a product is faulty, not of acceptable quality, or does not meet advertised specifications, it remains eligible for return regardless of category.

Refunds & Processing Timeframes

  • Approved refunds are processed within 7 business days of receiving returned goods
  • Refunds are issued to the original payment method, unless otherwise agreed
  • Replacement or repair may be offered where appropriate
  • Store credit may be offered only with customer consent

Handling fees and non-returnable service charges may not be refundable where permitted by law.


Restocking Fees

For approved change-of-mind or non-faulty returns, a 15% restocking fee applies.

  • Any applicable restocking fee will be clearly communicated prior to return approval
  • The fee will be deducted from the refund amount
  • Restocking fees do not apply to returns made under the Australian Consumer Law, including faulty, damaged, or misrepresented goods.

Return Shipping Costs

  • Change-of-mind returns: The customer is responsible for return shipping costs.
  • Faulty or defective products: ARC IP Networks covers return shipping under Australian Consumer Law.

Non-Warranty Repairs

For issues not covered by warranty:

  • ARC IP Networks will provide a quote before proceeding
  • Customers are responsible for all shipping and service costs
  • No repairs are undertaken without customer approval

Return Methods

Returns may be made:

  • In-store at ARC IP Networks – 6 George Street, Blackburn VIC 3130
  • Or by shipment as instructed by our support team

Proof of purchase is required for all returns.

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