Scan code: LN98079 Manufacturer code: 90-MXB9Y0-A0UAYZ

ASRock AMD B450M Steel Legend Ryzen AM4 Micro ATX Motherboard

ASRock B450M Steel Legend, AMD B450, S AM4, DDR4, SATA3, Dual M.2, 2-Way CrossFire, Realtek GbE, USB3.1 G2 A+C, MicroATX

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Scan code: LN98079 Manufacturer code: 90-MXB9Y0-A0UAYZ
Order now and get it tomorrow (upgrade to Sunday delivery at checkout)
Get it Tomorrow, 29 MayIn stock
spend over £280 and Buy Now, Pay Later or spread the cost of your finance over 24-48 months with a 10% deposit.
Delivery Options
  • By DPD On 30th May to your specified address. | £5.48 Receive SMS with one-hour delivery window Weekend, timed and European delivery options are available at checkout

    Have your parcel delivered by DPD to your specified address. Receive SMS with one-hour delivery window

    Weekend, timed and European delivery options are available at checkout
  • Collect instore Collect from our Bolton store, BL6 6PE | Free

    Order online, collect from our Bolton store (25-28 Enterprise Park, Middlebrook, Horwich, Bolton, BL6 6PE)

  • UPS and DPD Pickup Pickup from local convenience store | £4.79

    Collect your parcel from your newsagents, petrol stations and convenience stores

  • SCANPROTECT Protect against installation damage for 28 days. More info

    ScanProtect is an enhanced warranty specifically designed and offered by Scan to reduce the risk of any mishap or damage to components during installation.

    Our aim with ScanProtect is to encourage our customers to upgrade or build their own PC confidently. For a small additional fee our customers are provided with complete peace of mind.

Frequently Bought Together

ASRock B450M Steel Legend Micro ATX Motherboard

ASROCK Steel Legend

Tough As SteelThe Steel Legend Micro ATX motherboard represents the concept of rock-solid durability and alluring aesthetics and features a robust range of components to ensure a steady and reliable performance perfect for daily users or mainstream enthusiasts. This feature filled motherboard boasts AMD Quad CrossFireX support, 7.1 channel HD audio, type-C connectivity, dual m.2 sockets, steel PCI-E slot, 2x RGB LED headers, 1x ARGB LED headers and if that wasn't enough the B450m Steel legend houses built in lighting to give your system a real shine. Become a legend with ASRock.

AMD B450Chipset

AM4CPU Socket

Micro-ATXForm Factor

Ultra-Fast Storage

Dual M.2 Slots

Dual m.2 slotsThe B450M Steel Legend motherboard features two of the worlds fastest M.2 slots, one of which delivers up to PCIe Gen3 x4 32Gb/s transfer speeds whilst the other supports SATA3 6Gb/s, giving you two different options for lightning fast storage.

Reinforced PCI-E Slots

Steel PCI-E slots

Protect Your Sensitive ComponentsASRock have opted for a secure steel covered PCI-E slot on the B450m Steel Legend, this has two key benefits, reducing signal interference and allowing heavier GPUs to be securely installed without any pulling or dipping of the critical components.

Light Your Own Path with Polychrome RGB

Polychrome RGB

Make Your MarkASRock know that customisation and personalisation means alot to gamers, mainstream users and modding enthusiasts. Polychrome RGB offers comprehensive control over the built-in RGB LEDs or any connected LED strips, CPU fans, coolers, chassis and other RGB Devices. Colours can also be synchronised across Polychrome RGB Sync-certified accessories as well to give yourself that one true colour scheme.

Comprehensive Rear I/O Panel

Steel PCI-E slots

Super Alloy Motherboard

Aluminium Heatsink

XXL Aluminium HeatsinkExtra large aluminium alloy heatsinks effectively remove heat from the MOSFET and chipset to provide better system peformance.

Premium 60A Chokes

Premium 60A Power ChokeASRock’s premium 60A power chokes effectively make the saturation current up to three times better, thus providing enhanced and improved Vcore voltage to the motherboard.

12K Nichicon capacitors

Nichicon 12K Black CapsSupreme 12K black capacitors with lifespans of at least 12,000 hours, offering atleast 20% longer lifespan and better overall reliability than conventional capacitors.

i/o armor

I/O ArmorA new designed protective cover for all of the crucial parts near the motherboard's rear I/O, so that they won't easily be damaged by static electricity

sapphire black pcb

Sapphire Black PCBPure black PCB appearance. The new Sapphire Black PCB represents rock-solid quality and gives the motherboard a more mysterious aesthetic.

Glass Fabric PCB

High Density Glass Fabric PCBHigh Density Glass Fabric PCB design that reduces the gaps between the PCB layers to protect the motherboard against electrical shorts caused by humidity.

2oz Copper PCB

2oz Copper PCBUsing only carefully selected copper materials for PCB layers, 2oz Copper PCB delivers lower temperature and higher energy efficiency for overclocking.

Support Software for your ASRock Motherboard

ASRock Software

FULL SPIKE PROTECTIONASRock Full Spike Protection includes various technologies to prevent your motherboard’s components from being damaged by these unexpected voltage spikes.

ASRock Software

LIVE UPDATE & APP SHOPASRock Live Update & APP Shop is designed for your convenience. Users can download various apps and support software, optimise your system with ease and keep your motherboard up to date with
ASRock Live Update & APP Shop

Core Specifications
Edition B450M Steel Legend
Form Factor MicroATX
CPU Socket AM4
Chipset AMD B450
RAM Memory Support
Memory Type DDR4
Memory Channel Dual (2)
Memory Type (ECC) ECC/Non-ECC
Memory Type (R/U) UDIMM (Unbuffered)
Memory Speed (Mhz)
  • DDR4 - 2133
  • DDR4 - 2400
  • DDR4 - 2666
  • DDR4 - 2933
  • DDR4 - 3200(OC)
  • DDR4 - 3466+(OC)
  • DDR4 - 3533+(OC)
Max. Memory Capacity 64GB (4x16GB)
Audio Realtek ALC892 7.1 HD Audio
Graphics Support
Primary GPU Interface PCIe 3.0 (x16)
NVIDIA SLI Support Not Supported
AMD CrossFire Support 2-Way CrossFire
Integrated Graphics  
On-Board Graphics Connectors
  • DisplayPort 1.2
  • HDMI 1.4
Internal Connectivity
Expansion Slots
  • 1 x M.2, 22-30/42/60/80, SATA3
  • 1 x M.2, 22-42/60/80, PCIe Gen3
  • 1 x PCIe 2.0 x1
  • 1 x PCIe 2.0 x16 (x4 Bandwidth)
  • 1 x PCIe 3.0 x16
SATA Support SATA3 / M.2
RAID Support via SATA
Storage Mode Support
  • AHCI
  • Hot Plug
  • NCQ
  • NVMe Boot (via M.2 PCIe Slot)
  • NVMe Boot (via PCIe 3.0 Slot)
  • RAID 0 (SATA 0~3 ONLY)
  • RAID 1 (SATA 0~3 ONLY)
  • RAID 10 (SATA 0~3 ONLY)
Internal I/O
  • 1 x 24-pin (Power)
  • 1 x 4-pin CPU Fan Connector
  • 1 x 4-pin CPU OPT Fan Connector
  • 3 x 4-pin System Fan Connector
  • 1 x 8-pin (Power)
  • 1 x Addressable Digital RGB Header
  • 1 x AMD Fan LED Header
  • 1 x Chassis Intrusion connector
  • 1 x Front Panel Audio Header
  • 1 x Power LED / Speaker Header
  • 1 x RGB Header
  • 4 x SATA III - 6Gb/s
  • 1 x Serial (COM) Header
  • 1 x TPM Header
  • 2 x USB 2.0 Header
  • 1 x USB 3.1 Gen1 Header
External Connectivity
Network Interface Type Wired Gigabit LAN (10/100/1000)
Network Chip/Modules 1 x Realtek RTL8111H (Gigabit LAN)
Rear I/O Connectors
  • 1 x Center/Subwoofer Speaker Out
  • 1 x DisplayPort 1.2
  • 1 x Front Speaker Out
  • 1 x HDMI 1.4
  • 1 x Line In
  • 1 x Mic-In
  • 1 x PS/2 Keyboard/Mouse Combo
  • 1 x Rear Speaker Out
  • 1 x RJ-45
  • 1 x S/PDIF-Out (Optical)
  • 2 x USB 2.0
  • 4 x USB 3.1 Gen1 Type-A
  • 1 x USB 3.1 Gen2 Type-A
  • 1 x USB 3.1 Gen2 Type-C
Additional Specifications
Water Cooled No
QPI Speed N/A
Board Dimensions 244 x 244 mm
Additional Information
Scan Code LN98079
Model Number 90-MXB9Y0-A0UAYZ
GTIN 4717677338072

Please note your statutory rights are not affected.

For further information regarding Scan's warranty procedure please see our terms and conditions

24 months
Return to base
DOA Period:
28 days
RTB Period:
24 months
Manufacturer Contact Details
0871 472 4747

Does the ASRock AMD B450M Steel Legend Motherboard come with stand-offs?

I am thinking of buying this Motherboard but I don't know if i can use it in my case.
Asked by: Somerandomperson
Motherboard stand-offs will normally be supplied with the actual case.
Answered by: DavidScan
Date published: 2020-09-04

Ryzen 3600

Do new ones bought come with the new bois for the 3rd gen ryzen or does it still need to be updated? Thanks
Asked by: Jahunt
You will need to update the bios to use 3rd gen Ryzen.
Answered by: Josh123
Date published: 2020-05-04

which bios it is installed

can you tell me which version of the bios it is installed?
Asked by: Johnson123
We are unable to specify BIOS revisions. However please contact our Sales team before ordering, and we can arrange a BIOS Flash if required.
Answered by: DavidScan
Date published: 2020-07-30

Which BIOS version is installed?

Just need to know to check if ryzen 5 3600 is compatible.
Asked by: Crushlouis
Good Afternoon, The original BIOS will be installed, the new processor will need a BIOS update. We can do the BIOS update for you at a cost of £10 + VAT - all you would need to do is contact our sales department, you can reach them on 01204 474747 Alternatively, you can log a message via the link below and we will email you back! Kind Regards,
Answered by: LukeW
Date published: 2019-07-12
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ASRock AMD B450M Steel Legend Ryzen AM4 Micro ATX Motherboard
ASRock AMD B450M Steel Legend Ryzen AM4 Micro ATX Motherboard