End Of Life Sale Refurbished
Scan code: LN91357 Manufacturer code: 90-MXB8B0-A0UAYZ

ASRock AMD B450 Pro4 Ryzen ATX Motherboard

ASRock B450 Pro4, AMD B450, AM4, DDR4, 2x M.2, 2-Way CrossFire, Realtek GbE, USB 3.1 Gen2 A+C, ATX

Thumbnail 1 : ASRock AMD B450 Pro4 Ryzen ATX Motherboard Thumbnail 2 : ASRock AMD B450 Pro4 Ryzen ATX Motherboard Thumbnail 3 : ASRock AMD B450 Pro4 Ryzen ATX Motherboard Thumbnail 4 : ASRock AMD B450 Pro4 Ryzen ATX Motherboard
Scan code: LN91357 Manufacturer code: 90-MXB8B0-A0UAYZ
End Of Life This product is no longer available to purchase
Delivery Options
  • 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

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

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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.

B450 Pro4 Ryzen Gaming Motherboard by ASROCK


ASROCK PREMIUM QUALITY AMD ATX MOTHERBOARD The ASRock B450 Pro4 is the best motherboard for professionals who command an excellent performance for their system. Featuring AMD Quad CrossFire™ graphics support and Ryzen powered series CPUS. Prepared with M.2 slot that supports both SATA3 6Gb/s and four PCIe Gen3, the quality interface that excels data transfer speeds up to 32Gb/s. Incorporated 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 accomplish double the data transfer rate.

AMD B450Chipset

AM4CPU Socket

ATXForm Factor

Dual M.2 Slots


Impressive data transfer speeds up to 32Gb/s The B450 Pro4 motherboard is assembled with M.2 slot that supports both SATA3 6Gb/s and four PCIe Gen3. The ASRock 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.

On-board Dual USB 3.1 Gen2


up to 10 Gbps data transfer rates The B450 Pro4 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.

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.


SAPPHIRE BLACK PCB Witness the new mysterious Sapphire black PCB represents rock-solid quality and gives the motherboard a more mysterious touch.

copper pcb

LOWER TEMPERATURES AND EFFICIENT OVERCLOCKING The ASRock B450 Pro4 motherboard is engineered with 2 ounces copper inner layers, using only carefully selected copper materials for PCB layers, which provide an overall 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.


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.


Solid capacitor designASRock applied solid capacitors on this motherboard. With these solid caps, this motherboard is allowed to perform more stably and ensure longer lifetime.


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.


ELNA audio capsASRock applied ELNA audio capacitors on mainstream and entry-level motherboards. Compared with traditional solid caps, the leakage current of ELNA audio caps is merely 3uA. This is the key to reduce noise level significantly and satisfy even the pickiest audiophiles.


A-tuning softwareA-Tuning is ASRock's multi-purpose software suite with a new interface, more new features and improved utilities.


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 B450 Pro4, AMD B450, AM4, DDR4, 2x M.2, 2-Way CrossFire, Realtek GbE, USB 3.1 Gen2 A+C, ATX is rated 4.8 out of 5 by 4.
Rated 4 out of 5 by from Decent board for midrange user. First time using ASRock products, and I'm pleased with it. Bios was a bit confusing as I'm used to ASUS boards, but it's not difficult to transition.
Date published: 2020-09-09
Rated 5 out of 5 by from All the ports and equipment i needed. Does what is expected, has built in overclocking software but not tried it out.
Date published: 2020-02-28
Rated 5 out of 5 by from Happy with this It's a nice board, well-presented in its packaging, I thought that it was very rigid compared to some boards I have used in the past, which is a nice feature. There are 2 PCIe x16 slots, 6 SATA 3 connectors, and 2 M2 connectors. Oh, hang on, if you use M2 device connector 2, 2 of the SATA 3 connectors won't work, and if you use the other M2 device connector, the second PCIe x16 slot is disconnected. (I think that this sort of info should come in the 'Specifications' on the website, but even if it did, I would still have chosen this one). Not to worry, I only have one graphics card, and only one M2 device,a combination that is the 'sweet spot' for this board. Somehow, I found myself disappointed to only have one USB3 connector on the board, but there are plenty 'round the back'. Not a criticism of this board, but what use are so many of them there? The included manual is a great thick book with everything repeated in 13 languages - fortunately including English - with lots of unnecessary drawings showing how to insert various things, and omitting the normal wad of descriptions of things one can set in the BIOS (almost never saying what they do, so no loss there). Anyone who ever built a computer before will find just about anything in the manual superfluous - 12 out of 13 of the languages for a start -and just about everything else except which pins are used for the on/off switch etc. The BIOS screens have lost the old white on blue appearance and now appear in 'graphics mode'. Generally, the options seem to be simpler. Perhaps this is because the board is mainstream rather than enthusiast. For me, this board replaces a Phenom II system that won't take MS update 1903, and it runs a lot faster, so I am very happy with my purchase, apart from the fact that MS made me spend the money! I can recommend it as a replacement for an old system when you get fed up with the incessant Windows 10 bleats about update 1903.
Date published: 2019-11-05
Rated 5 out of 5 by from Great no fuss motherboard Was looking for a motherboard for a Ryzen 7 2700x and this does not disappoint. No fancy LEDs, plenty of space and the BIOS is easy to navigate and use to overclock. Recognises my DDR4 3200, so that's good. Just had to go in the bios to overclock it.
Date published: 2018-11-14
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3rd Gen Ryzen Support

Does this board ship with the updated bios allowing compatibility with 3rd gen ryzen out of the box or will this need to be updated using an older cpu?
Asked by: W1ll
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: 2020-08-05

Display over type c USB 3.1 gen 2 port

Does the type C USB3.1 gen2 port on this support display output?
Asked by: MaxH
Good Afternoon, Unfortunately, I am unable to find this information in the motherboards manual, we would recommend contacting the manufacturer directly for this information. Kind Regards,
Answered by: LukeW
Date published: 2019-07-29

Will this work with Nvidia GPU?

Looking to purchase to fit my RTX 2070
Asked by: KJSX
Hi, Yes, this should work fine with most GPU's. Regards,
Answered by: LukeW
Date published: 2019-02-05

Does this board come updated to work with an amd ryzen 5 3600?

Asked by: Zacooo
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ASRock AMD B450 Pro4 Ryzen ATX Motherboard
ASRock AMD B450 Pro4 Ryzen ATX Motherboard