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ASUS  |  SKU: PCAUPN51-S1-BB5278MD  |  Condition: Brand New  |  UPC/EAN: 4711387267615

Asus Mini PC PN51-S1 Barebone (PN51-S1-BB5278MD), Ryzen 5 5500U, DDR4 SO-DIMM, 2.5"/M.2, HDMI, DP, USB-C, 2.5G LAN, Wi-Fi6, VESA - No RAM, Storage or O/S

£318.99 (Inc VAT)
Excl VAT £265.83
Tax included Shipping calculated at checkout.


Ultracompact computer with an AMD Ryzen 5000-series mobile processor and support for triple 4K displays, with up to 64 GB DDR4 RAM, M.2 SSD, WiFi 6, Windows 10 Pro and dual USB 3.2 Gen 1 Type-C.

  • Powered by AMD Ryzen 5000U: Latest mobile processor with Radeon™ graphics
  • Triple-display support: Connect up to three monitors, at resolutions of up to 4K
  • 8K UHD visuals: High resolutions at up to 60 Hz, via DisplayPort Dual-Mode (DP++)
  • USB Power Delivery input support: Space-saving design that also reduces cable redundancy
  • Onboard 2.5 Gbps Ethernet: High-speed network connectivity, built right in
  • High-speed wireless: Integrated WiFi 6 and Bluetooth for easy cordless connections
  • Dual-storage design: Up to 1 TB 2.5-inch hard disk drive and up to 1 TB M.2 SSD
  • 24/7 reliability: Extensively tested to ensure long-term dependability
Easy modification, maximum possibilities

ASUS Mini PC PN51-S1 is an ultracompact computer that delivers powerful performance for a wide variety of home and business applications. Featuring the latest AMD Ryzen™ 5000 mobile processor with Radeon™ graphics, plus support for high-speed 3200 MHz DDR4 memory, Mini PC PN51-S1 is ready for demanding workloads, yet its diminutive size takes up minimal space on a desk and makes it suited for applications where traditional PCs won’t fit – from digital signage to home-theater setups.


ASUS Mini PC PN51-S1 is powered by the latest AMD Ryzen 5000U mobile processor. Compared with traditional same-tier mobile processors this delivers a whole-system performance uplift of up to 20.2%, and an up to 58.2% improvement for daily multitask computing–ensuring smooth operations for everything you do.

4K resolution and triple-display support

ASUS Mini PC PN51-S1 supports up to three displays with 4K resolution through HDMI, DisplayPort over dual USB-C and a DisplayPort, with no restriction on the combination.

Hyper - realistic 8K support

ASUS Mini PC PN51-S1 also supports stunning 8K UHD through DisplayPort 1.4 or Type-C DisplayPort, for detail that's 4X greater than 4K or a remarkable 16X higher than traditional Full HD output. Specifically, PN51-S1 will pump 8K visuals at up to 30 Hz via a single DisplayPort and at up to 60 Hz through DisplayPort Dual-Mode (DP++)**, bringing every image to life in breathtaking style.
** DisplayPort Dual-Mode requires DP++-compatible devices.

Serious graphics

ASUS Mini PC PN51-S1 features class-leading graphics performance, powered by AMD Radeon. In fact, PN51-S1’s 6489 score in 3DMark 11 thrashes mini PCs powered by traditional CPUs by over 170%.

Ready for any scenario

ASUS Mini PC PN51-S1 supports up to three video outputs, so it offers flexibility to handle all manner of multi-display setups. You’re also free to choose your own combination of ports, making PN51-S1 suitable for almost any conceivable display scenario.*
*High-resolution, multi-display support requires sufficient memory bandwidth.

Diverse applications

With support for up to three 4K displays*, ASUS Mini PC PN51-S1 can be used to build high-resolution signage walls at lounges, halls, exhibitions and retail stores, all powered from just one device – saving on both cost and maintenance. As well, PN51-S1’s triple-display and 2.5 Gbps LAN support makes it easy to share information in workplaces, offices or conference rooms.
* Support for triple displays with 4K resolutions requires at least 2 x 3200 MHz DDR4 4 GB memory.

Modern, space-saving chassis

With a modern design featuring sleek lines and a stylish, brushed finish, ASUS Mini PC PN51-S1 easily blends into home, office and retail environments. Compact and lightweight at 115 x 115 x 49 mm, and with a mere 0.62-liter volume, it can be placed almost anywhere and even attached to the back of a display with a VESA mount for a space-saving, all-in-one solution.

Efficient SSD heatsink

ASUS Mini PC PN51-S1 also benefits from an integrated SSD heatsink that can reduce the temperature of the M.2 drive by 10°C or even cooler, compared to use without the heatsink. This helps ensure both durability and reliability, potentially saving on maintenance costs.

High-speed connectivity

ASUS Mini PC PN51-S1 provides comprehensive connectivity with multiple ports, including dual USB 3.2 Gen 1 Type-C ports.

Hyper-fast 2.5 Gbps networking

ASUS Mini PC PN51-S1 is engineered with onboard networking that runs at up to 2.5 Gbps – or 2.5X faster than even gigabit Ethernet. This hyper-fast LAN support provides seriously speedy networking that makes everyday tasks smoother and more efficient.

Power Delivery input

With support for USB Power Delivery input, PN51-S1 can receive power from a supported display or other device via a cable, eliminating the need for separate power adapters to keep your workspace uncluttered.
* Power Delivery input support requires a power supply with an output capability of at least 65 W for R3 5300U & R5 5500U, and at least 90 W for R7 5700U.

Reduce environmental impact while lowering operating costs

ASUS Mini PC PN51-S1 has an energy-efficient design that reduces environmental impact while helping to lower operating costs. Eco-friendly ASUS Mini PCs are recipients of some of the industry's highest environmental certifications, including ENERGY STAR®. Specifically, PN51-S1 consumes as little as 7.3 watts at idle. It is also whisper-quiet, generating just 21.9 dBA of noise at idle and 34.7 dB at full load.

ASUS Business Manager

The ASUS Business Manager software suite provides exclusive features for Mini PC PN51-S1. Designed for businesses that lack adequate IT support, it simplifies the processes of management and maintenance.

USB port management and administration security

ASUS Mini PC PN51-S1 offers UEFI-level management of USB ports, so they’re easy to selectively enable or disable. An admin password can also be applied to ensure that only authorized users are able to access the system’s security settings.

Tested for perfection

ASUS Mini PCs undergo rigorous noise, vibration, drop and thermal-shock tests to ensure they meet exacting ASUS standards and exceed industry requirements. Be confident that your ASUS Mini PC can cope with extreme conditions for extended periods, ranging from dry 0° C temperatures to humid and hot environments exceeding 50° C.




  • #Hide#Fully Built / Barebone: Barebone
  • Chassis: Asus Mini PC PN51-S1
  • Tower / Small Form Factor: Small Form Factor
  • Processor: AMD Ryzen 5 5500U (2.1GHz)
  • Processor Details: 6-Core
    4GHz turbo
  • Chipset: Integrated
  • Graphics: Integrated Radeon Vega Graphics
  • #Hide#Processor: AMD Ryzen 5
  • Memory: None
  • Memory Details: 2 x DDR4 SO-DIMM Slots
    Max 64GB (2x 32GB)
  • Hard Drive: None
  • SSD Drive: None
  • Optical Drive: None
  • Supported Drives: 1 x M.2 2280 PCIe Gen3x4
    1 x 2.5"" SATA III (Max 7mm high)

    *Max 1TB drive support
  • Operating System: No O/S
  • Front I/O: 1 x USB 3.2 Gen1 Type-C
    1 x USB 3.2 Gen1
    1 x Audio Jack
  • Back I/O: "1 x USB 3.2 Gen1 Type-C (w/ DP output, PD input)
    1 x HDMI
    2 x USB 3.2 Gen1
    1 x DiaplayPort
    1 x 2.5G (RJ45) LAN
    1 x DC-in"
  • LAN: 2.5G LAN
  • Wireless: Wi-Fi 6
  • Bluetooth: Bluetooth 5.0
  • Power Unit: "19Vdc, 3.42A, 65W Power Adapter"
  • Keyboard and Mouse: No
  • Dimensions: (WxDxH) 115 x 115 x 49 mm
    0.62L volume
  • Additional Features: See Overview
  • Package Weight: 1.4000 kg
  • Package Type: Retail
  • Warranty: 3 Years

Technical Specifications

  • Grade
    Brand New
  • Model
  • Part Number

Grading Guide

New Open Box:
Products in this category are unused and in excellent condition but may have been opened. They include all original accessories and documentation.


  • Unused and in like-new condition.
  • Original packaging opened, but contents untouched
    All accessories included.

New No Box:
Products in this category are brand new and unused but may not come in the original packaging. They include all original accessories and documentation.


  • Unused, but packaging may be missing
  • All accessories included

Excellent Used:
Used products in this category are in excellent condition with minimal signs of wear. They have been well-maintained and function perfectly.


  • Minimal cosmetic wear
    Fully functional
  • Well-maintained appearance

Good Used:
Used products in this category show some signs of wear but are still in good condition. They function well but may have minor cosmetic flaws.


  • Noticeable cosmetic wear
  • Fully functional
  • Minor cosmetic flaws

Signs of Cosmetic Wear:
Products in this category have visible signs of cosmetic wear. They may have scratches, dents, or other aesthetic imperfections but are functional.


  • Visible cosmetic wear
  • Fully functional
  • Scratches, dents, or other aesthetic imperfections

Parts Only:
Products in this category are sold as-is and are intended for use as spare parts. They may have functional issues and are not guaranteed to work.


  • Sold for parts or repair
  • Not fully functional
  • Intended for spare parts use


Brand New Products: All our Brand New products come with Manufaturer warranty. These can vary in length and it's important to check with the manufaturer of the product what warranty they provide and what is covered.

Used Products:All our used products come with 1 years warranty provided by us and some products may have manufaturer warranty which will be made apparent on the product page.

Refurbished Products: With our refurbished products, we offer a free 3-month warranty which covers all software and hardware issues, that have not been influenced by the customer.

Custom Gaming PCs:All our Custom PCs by default come with 3 years warranty. This includes parts and labour. You can also upgrade to 5 years warranty. Our warranty includes all hardware issues relating to the machine. If there is any faults, we will attempt to solve this remotely and if needed get the PC collected and back to base for repair.

Read more - Warranty Information

Payment & Security

Payment methods

  • Visa
  • Mastercard
  • PayPal
  • Klarna
  • Google Pay
  • Apple Pay
  • Shop Pay
  • Clearpay

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Help and Advice

Need a few things clearing up? Check out our Help and Advice section.

Asus Mini PC PN51-S1 Barebone (PN51-S1-BB5278MD) Ryzen 5

Asus Mini PC PN51-S1 Barebone (PN51-S1-BB5278MD), Ryzen 5 5500U, DDR4 SO-DIMM, 2.5"/M.2, HDMI, DP, USB-C, 2.5G LAN, Wi-Fi6, VESA - No RAM, Storage or O/S

£318.99 (Inc VAT)
Excl VAT £265.83


Brand New



Part Number










Graphics Card


Solid State Drive (SSD)


Hard Disk Drive (HDD)




Power Supply


Network Connectivity (WiFi + Bluetooth)


Operating System


Mouse and Keyboard



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