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Scan code: LN91356 Manufacturer code: 90-MXB8A0-A0UAYZ

ASRock AMD Fatal1ty B450 K4 Ryzen ATX Motherboard

ASRock Fatal1ty B450 Gaming K4, AMD B450, AM4, DDR4, 2x M.2, 2-Way CrossFire, Realtek GbE, USB 3.1 Gen2 A+C, ATX

Thumbnail 1 : ASRock AMD Fatal1ty B450 K4 Ryzen ATX Motherboard Thumbnail 2 : ASRock AMD Fatal1ty B450 K4 Ryzen ATX Motherboard Thumbnail 3 : ASRock AMD Fatal1ty B450 K4 Ryzen ATX Motherboard Thumbnail 4 : ASRock AMD Fatal1ty B450 K4 Ryzen ATX Motherboard
Scan code: LN91356 Manufacturer code: 90-MXB8A0-A0UAYZ
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  • By DPD to your specified address. | £5.48 Receive SMS with one-hour delivery window Weekend, timed and European delivery options are available at checkout

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    Weekend, timed and European delivery options are available at checkout
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  • 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.

Fatal1ty B450 K4 Professional Gaming Motherboard


ASROCK - YOUR MOST TRUSTWORTHY ALLYThe Asrock Fatal1ty B450 K4 is the ultimate motherboard for gamers who require the most superior performance. Featuring AMD Quad CrossFire™ graphics support and Ryzen powered series CPUS. Equipped with M.2 slot that supports both SATA3 6Gb/s and four PCIe Gen3, the ultra-interface that pushes data transfer speeds up to 32Gb/s. Integrated stainless steel PCIe slots, which avoid any signal interference with graphics cards. Featuring high quality manufactured 2oz Copper, for PCB layers providing lower temperatures and higher energy productivity for overclocking. With on-board Dual USB 3.1 Gen 2 ports, users can achieve double the data transfer rate. F-Stream multi-purpose software enables you to customise your gaming experience.

AMD B450Chipset

AM4CPU Socket

ATXForm Factor

Dual M.2 Slots


Boosts data transfer speeds up to 32Gb/s The ASRock Fatal1ty B450 K4 motherboard is assembled with M.2 slot that supports both SATA3 6Gb/s and PCIe Gen3 x4 Ultra M.2 interface that boosts data transfer speeds up to 32Gb/s. Compatible with ASRock’s U.2 Kit for installing some of the world’s speediest U.2 PCIe Gen3 x4 SSD.

AMD StoreMI Technology


The powerful pc tool AMD StoreMI technology automatically moves the data you access the most to the SSD, so you get the best of both worlds: SSD responsiveness, and mechanical hard disk capacity. You can also use up to 2GB of RAM as a last-level cache for ultra-fast data.

Illuminate Your PC with Polychrome RGB

rgb rgb

ON-BOARD RGB LED HEADERS Customise your PC with Polychrome RGB, in addition to the built-in illumination the on-board RGB headers/addressable RGB header allows the motherboard to be connected to compatible LED devices such as strip, CPU fans, coolers, chassis and more. Users can also synchronise RGB LED devices across the Polychrome RGB Sync-certified accessories to create their own exclusive lighting effects.
*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.

Extraordinary Levels of Audio Realism


CREATIVE SOUND BLASTER™ CINEMA5 Discover a new universe of cinematic quality audio that provides extraordinary levels of audio realism, dynamics and punch to gaming sound. Whether gaming or watching a film, Reality 3D technology lets you enable 5.1/7.1 surround sound for an additional layer of transience to your listening experience even with just a pair of headphones or stereo speakers.

Advanced PCIe Steel Slots

steel slot

PREVENT SIGNAL INTERFERENCE WITH GRAPHICS CARDS The advanced PCIe Steel Slots are packed with solid protection that prevent any signal interference with graphics cards. It also ensures the heavy graphics cards to be well-installed in the PCIe slots safely.

On-board Dual USB 3.1 Gen2


up to 10 Gbps data transfer rates The Fatal1ty B450 K4 motherboard features a pair of on-board Type-A and Type-C USB 3.1 Gen2 ports, built on the rear i/o for supporting next generation USB 3.1 Gen2 devices, which delivers up to 10 Gbps data transfer rates.

Modify Your Weapon with F-Stream

key master

ENHANCE YOUR GAMING MARATHONS Key Master consists of two major features, Sniper Key and Macro Key. This enhances your mouse and keyboard whilt you enjoy gaming with customisable macros, sniper modes, key repeat rates and repeat delay.


F-Stream F-Stream is Fatal1ty's multi purpose software suite with a new interface, more new features and improved utilities.

mouse port

Fatal1ty Mouse Port After plugging a USB mouse into the Fatal1ty Mouse Port and running F-Stream, gamers can choose their own preferred mouse polling rate from 125 Hz to 1000 Hz.

Superior Motherboard Alloy

power choke

PREMIUM POWER CHOKE Compared to traditional chokes, ASRock’s premium power chokes effectively make the saturation current up to three times better, thus providing enhanced and improved Vcore voltage to the motherboard.


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

fabric density

HIGH DENSITY GLASS FABRIC PCB ASRock features the High Density Glass Fabric PCB design, which reduces the gaps between the PCB layers to protect the motherboard against electrical shorts caused by humidity.

copper pcb

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

Support Software and Premium Components


TRIPLE MONITOR The ASRock motherboard proudly supports Triple Monitor, this means users can enjoy triple the graphics! You may choose up to three display interfaces from the rear i/o to connect monitors and use them simultaneously without installing another graphics card.


3 GRAPHICS OUTPUTSComplete with all three types of most used connectors. Packed with a D-Sub + DisplayPort + HDMI combo. Plus the HDMI port supports 4K resolution.
*Supported with A-Series APUs only.


WATER PUMP HEADERThis is not only a standard CPU fan header, but also supports water pumps. This header provides a maximum of 2A power for supporting the most popular water pumps. Users can also adjust the voltage of the water pump to get a higher cooling performance with lower noise.


DIGI POWERUnlike traditional motherboards that use analog power, this motherboard uses a next generation digital PWM (Pulse-Width Modulation) design, which provides CPU Vcore voltage more efficiently and smoothly, so that the stability and lifespan of the motherboard is greatly enhanced.


FULL SPIKE PROTECTIONSome sensitive digital components on the motherboard are vulnerable to power surges, the excessive current may cause your system to malfunction immediately. ASRock Full Spike Protection includes various technologies to prevent your motherboard’s components from being damaged by these unexpected voltage spikes.


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 the:
ASRock Live Update & APP Shop.


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
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ASRock Fatal1ty B450 Gaming K4, AMD B450, AM4, DDR4, 2x M.2, 2-Way CrossFire, Realtek GbE, USB 3.1 Gen2 A+C, ATX is rated 4.5 out of 5 by 2.
Rated 4 out of 5 by from Updating older PC, using this with an AMD Ryzen 2600X Friends PC needed an upgrade, so using the same case/PSU I replaced the older Intel i5 with this motherboard. With this motherboard an AMD Ryzen 2600X CPU was fitted, with the stock cooler. 16GB of DDR4 memory was fitted, plus a 500GB M.2. SSD. Installation of those compenents were easy as the board came with a printed manual and plenty of screws. One thing to note though and this is why it's not 5 stars. The manual does not include a picture of the case pin layout, so I had to go online to find out where to plug in the Power Button, Reset Button etc. The layout of the board is very good, with the previously mentioned pins close to the edge near to the bottom of the board, so the cables could be hidden easily enough. Plenty of Case Fan/Pump Support. This PC now runs the 2600X at stock, along with 2 14cm case fans, nice and quiet. I'd recommend this board for any mid build, on tests it handled overclocking the CPU and memory, however I didn't proceed further with those as the CPU is plenty fast without any OC needed.
Date published: 2020-08-26
Rated 5 out of 5 by from ASRock Fatal1ty B450 Gaming K4 : Great value ASRock Fatal1ty B450 Gaming K4 : does not support the very latest generations of USB, PCIE .. but unless you have an incredibly powerful graphics card or need USB 3.2 instead of 3,1 Gen2 what does it matter ? My M,2 PCIE3 1TB PCIE3 card cost £100 , a PCIE4 version would cost around twice as much. For under £80 this board is amazing value.
Date published: 2020-03-24
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Bios version

Is it possible for this to be flashed with the latest bios before shipping so it is comoatible with ryzen 3000 matisse processors? Thanks
Asked by: SuperDux
Good Afternoon, Yes, we would be able to update the BIOS for you prior to shipping at a cost of £10+ VAT. All you would need to do is speak with our sales department and they should be able to arrange this for you. You can reach them on 01204 474747 or by logging a message via the link below and we will email you back. https://www.scan.co.uk/help/orders/sales/sales-query Kind Regards,
Answered by: LukeW
Date published: 2019-11-04
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ASRock AMD Fatal1ty B450 K4 Ryzen ATX Motherboard
ASRock AMD Fatal1ty B450 K4 Ryzen ATX Motherboard