End Of Life
Scan code: LN108372 Manufacturer code: 90-MXBCU0-A0UAYZ

ASRock B550M Steel Legend Micro-ATX Motherboard

ASRock B550M Steel Legend Motherboard, AMD B550, S AM4, DDR4, SATA3, PCIe 4.0, Dual M.2, CrossFire, 2.5GbE, Micro-ATX

Thumbnail 1 : ASRock B550M Steel Legend Micro-ATX Motherboard Thumbnail 2 : ASRock B550M Steel Legend Micro-ATX Motherboard Thumbnail 3 : ASRock B550M Steel Legend Micro-ATX Motherboard Thumbnail 4 : ASRock B550M Steel Legend Micro-ATX Motherboard
Scan code: LN108372 Manufacturer code: 90-MXBCU0-A0UAYZ
End Of Life This product is no longer available to purchase
Delivery Options
  • By DPD to your specified address. | £11.50 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.

ASRock B550M Steel Legend AMD Ryzen Micro ATX Motherboard

ASRock B550M Steel Legend AMD Ryzen Micro ATX Motherboard

Tough as Steel, a True Legend. The Steel Legend Micro ATX motherboard symbolizes the concept of pure durability and alluring aesthetics and features a robust range of components to ensure a steady and reliable performance. This AMD B550M Steel Legend motherboard from ASRock is equipped for 3rd Gen AMD Ryzen™ processors and future generation processors. With ASRock Super Alloy features you get to appreciate the XXL Aluminium Heatsink, first-class components and 2oz Copper PCB layers. Featuring the quick Dragon 2.5Gb/s LAN platform and a wealth of USB connectivity, and Dual M.2 with M.2 armor, this solution is compatible to perform for SSD. Enjoy spectacular lighting and with Polychrome RGB Sync-certified devices you can synchronize across your compatible accessories.

Please note: B550 Motherboards are ready for 3rd Gen AMD AM4 Ryzen™ Processors and Future AMD Ryzen™ Processors.
Not Compatible with AMD Ryzen™ 5 3400G & AMD Ryzen™ 3 3200G.

AMD B550Chipset

AM4CPU Socket

3rd Gen AMD Ryzen™and Future Compatible CPUs

Micro ATXForm Factor

Get Endless Performance Possibilities with Steel Style

Polychrome RGB Sync

Synchronize across the RGB Sync-certified accessories ASRock motherboards deliver stunning performance and superior aesthetics with an array of lighting effects. Gamers get very comprehensive control to perform the built-in RGB LEDs or the connected LED strips, CPU fans, coolers, chassis and any RGB devices smoothly. Includes Two Addressable RGB LED Headers and Two RGB LED Headers.

*Devices can be synchronized across the Polychrome RGB Sync-certified accessories as well. *The addressable RGB LED header supports WS2812B addressable RGB LED strip (5V/Data/GND), with a maximum power rating of 3A (5V), a max of 80 LEDs and length within 2 meters. *The RGB LED header supports standard 5050 RGB LED strip (12V/G/R/B), with a maximum power rating of 3A (12V) and length within 2 meters.

Component Breakdown of the B550M Steel Legend

Design of ASRock B550M AMD Ryzen Motherboard

1. Supports 3rd Gen / future AM4 AMD Ryzen™ Processors   |   2. Dual Channel DDR4 Memory Technology
3. 24Pin ATX Hi-Density Connector   |   4. XXL Aluminium Alloy Heatsink   |   5. 8+4Pin 12V Hi-Density Power Connector
6. Premium 60A Power Choke / 10 Power Phase Design / Digi Power with 50A Dr.MOS
7. PCIe Steel Slot, 1 PCIe 4.0 x16, 1 PCIe 3.0 x16, 1 PCIe 3.0 x1
8. Hyper M.2 PCIe Gen4x4 / Unbeatable Heatsink Armor
9. Premium Audio / Realtek ALC 1200 Codec / Nahimic Audio / PCB Shielding Layers
10. M.2 (Key E) Slot for Wi-Fi (*Module is not included)   |   11. M.2 Slot running PCIe Gen3 x2 & SATA3

Windows 11 Logo Is your Windows Genuine?

Many copies of Windows operating systems bought from unofficial channels like auction websites are not Genuine, even if they have allowed you to upgrade to newer versions. Buying a Genuine copy from an authorised reseller like Scan ensures you will get the latest updates, security patches and support from Microsoft.


Boosted for Maximum Networking Performance

networking connectivity

Dragon 2.5 Gb/s LAN   |   Dual USB 3.2 Gen2 TYPE A+C   |   Front USB 3.2 Gen1 Type-C ASRock B550M Steel Legend features I/O Armor and reserves more flexible space with an adjustable IO shield when installing, thus fitting chassis perfectly without any issues. Includes two of the most used connectors with HDMI and DisplayPort combo. Boost networking performance up to 2.5X the bandwidth compared to the standard gigabit Ethernet, you’ll enjoy the faster and uncompromising connectivity experience for gaming, file transfers and backups. This motherboard has a pair of onboard Type-A and Type-C USB 3.2 Gen2 ports built on the rear I/O for supporting next generation USB 3.2 Gen2 devices and to deliver up to 10 Gbps data transfer rates. Features 8 USB 3.2 Gen1 (4 Front, 4 Rear) giving you a wide variety of connections.

Unbeatable Heatsink Armor

Dual M.2 Armor

Dual M.2 Sockets for SSD Engineered with an aluminium alloy heatsink top cover which dissipates heat efficiently, underneath its strong cover are Two M.2 Key M sockets for rapid SSDs. Plus, the Hyper M.2 socket supports PCIe Gen4 x4 – while the M.2 socket is ready to run PCIe Gen3 x2 and SATA3 mode.

Reinforced Steel Slot

PCI-e 4.0

Strong Protection The strengthened steel slot comes with the next generation PCI Express 4.0 standard. The various benefits include extra anchor points, stronger latch, ensures signal stability, and makes sure heavy graphics cards to be well-installed.

Equipped to Deliver an Extreme Audio Performance

ASRock audio

AUDIO THAT MATTERS Whether you are using headphones, a headset, external or internal speakers, via USB, Wi-Fi, analog output or even HDMI, Nahimic Audio offers you the most engaging listening experience, vibrant and rich with details.

ASRock Super Motherboard Alloy


XXL ALUMINIUM ALLOY HEATSINKExtra large aluminum alloy heat sinks that effectively take away heat from the MOSFET and chipset so that your whole system may perform more stable.

power choke

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.


DR. MOSOptimized for synchronous buck-set down voltage applications, intelligently delivering higher current and driving up to 50A continuous current for each phase, thus providing improved thermal result and superior performance.

power choke

NICHICON 12K BLACK CAPSASRock applied Nichicon 12K Black Caps that offer 20% longer lifespans and provide more stability and reliability.

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.

matte black PCB

MATTE BLACK PCBA new mysterious matte black and copper color scheme to match the prestigious components on ASRock's high-end motherboards.

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.

Audio Jacks

Gold Audio JacksEverything will wear off in time, but gold looks better! Gold audio jack provides stable sound transmission!

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

AMD Ryzen Processors

Please note your statutory rights are not affected.

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

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

2x PCIE 4.0x16 lanes?

Just want to clarify if the two 16 lane PCIE slots are BOTH PCIE 4.0 or if one is 3.0? My understanding is the B550 chipset enables the direct-to-CPU lanes giving the board one PCIE4.0 M.2 slot and one PCIE 4.0 slot.
Asked by: iniaes
  • y_2020, m_9, d_10, h_15CST
  • bvseo_bulk, prod_bvqa, vn_bulk_3.0.12
  • cp_1, bvpage1
  • co_hasquestions, tq_1
  • loc_en_GB, sid_108372, prod, sort_[SortEntry(order=LOCALE, direction=DESCENDING), SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=NUM_ANSWERS, direction=DESCENDING)]
  • clientName_scan
ASRock B550M Steel Legend Micro-ATX Motherboard
ASRock B550M Steel Legend Micro-ATX Motherboard