Brand | MSI |
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Product Dimensions | 22 x 24 x 3 cm; 1 Grams |
Batteries | Lithium Ion batteries required. (included) |
Item model number | 7C56-002R |
Manufacturer | MSI COMPUTER |
Color | Black |
Form Factor | ATX |
Processor Socket | Socket AM4 |
Memory Technology | DDR4 |
Computer Memory Type | DDR4 SDRAM |
Maximum Memory Supported | 128 GB |
Memory Clock Speed | 4400 MHz |
Graphics Card Interface | PCI Express |
Number of USB 2.0 Ports | 4 |
Are Batteries Included | Yes |
Lithium Battery Packaging | Batteries contained in equipment |
Number Of Lithium Ion Cells | 1 |
Item Weight | 1 g |
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MSI B550-A PRO Motherboard ATX - Supports AMD Ryzen 3rd Gen Processors, AM4, DDR4 Boost (4400MHz/OC), 1 x PCIe 4.0/3.0 x16, 1 x PCIe 3.0/3.0 x16, 1 x M.2 Gen4 x4, 1 x M.2 Gen3 x4, HDMI, Gigabit LAN
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Brand | MSI |
CPU socket | Socket AM4 |
RAM memory technology | DDR4 |
Compatible processors | 3rd generation AMD Ryzen 9, Ryzen7, Ryzen 5 AM4 |
Chipset type | AMD B550 |
Memory clock speed | 4400 MHz |
Platform | Windows 10 |
Memory storage capacity | 128 GB |
RAM memory maximum size | 128 GB |
Graphics card interface | PCI Express |
About this item
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- Powered by 3rd generation AMD Ryzen 9, Ryzen7, Ryzen 5 AM4 to maximize connectivity and speed with lightning M.2, PCIe 4.0, USB 3.2 Gen2 and up to 128 GB of DDR4 (4400 MHz)
- Core Boost technology combines optimised power circuit layouts and digital power design which allows for precise and steady current delivery to the CPU
- With 3rd Gen Ryzen processors, this motherboard features the latest Gen4 PCI-E and M.2 solution with up to 64 GB/s bandwidth for maximum transfer speed and allow for increasing storage capacity at maximum speed
- Addressable LED Ready with Mystic Light Extension provides a JRAINBOW pinheader for complete function to connect to addressable RGB strips and control the RGB light all around the system
- AUDIO BOOST which rewards your ears with studio grade sound quality for the most immersive gaming experience
- Enhanced Thermal Solution includes extended heatsink, 7 W/mK level thermal and choke pad with 2 oz thickened copper PCB to ensure best performance for gamers
- Flash BIOS Button allows users to simply use a USB key to flash any BIOS within seconds, without installing a CPU, memory or graphics card
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Customer Rating | 4.5 out of 5 stars (1890) | 4.7 out of 5 stars (6217) | 4.7 out of 5 stars (6217) | 4.6 out of 5 stars (289) | 4.6 out of 5 stars (207) |
Price | £108.19 | £129.98 | £225.00 | £123.98 | £172.84 |
Sold By | Amazon Warehouse | Amazon.co.uk | The Full-Cart | Amazon.co.uk | Amazon EU |
Are batteries required? | Yes | No | No | No | Yes |
Graphics Card Interface | PCI Express | PCI Express | PCI Express | PCI Express | PCI Express |
Memory Clock Speed | 4400 MHz | 4400 MHz | 4866 MHz | 4000 MHz | 5100 MHz |
Memory Speed | 4400 MHz | 4400 MHz | 4866 MHz | — | 5100 MHz |
RAM Type | DDR4 SDRAM | DDR4 SDRAM | DDR4 SDRAM | DDR4 SDRAM | DDR4 SDRAM |
From the manufacturer


About MSI
MSI is a trusted name in gaming and esports. Having dedicated countless hours and committed numerous resources to support the world’s most aspiring and best gamers, MSI use their knowledge and expertise in their products in return. MSI integrated all gamer’s aspirational functions in its gaming rigs and pushing the performance beyond limits.
B550-A PRO
Advancing Ascension
Experience the new generation of the B550-A PRO motherboard powered by 3rd Gen AMD 3000 series AM4 processors. Outperform your system's capacity with Lightning Gen 4 solution. Exclusive DDR4 Boost and Core Boost are created to keep you one step ahead of your competition. Extended Heatsink Design, 7W/mK level thermal & choke pad with 2oz thickened copper help your PC remain cool, high performing and reliable.
- Designed for 3rd Gen AMD Ryzen processors with Lightning M.2, PCIe 4.0, USB 3.2 Gen 2
- Addressable LED Ready with a JRAINBOW pinheader addressable RGB strips and control the RGB light all around the system
- Extended Heatsink Design improves VRM heat dissipation and ensures the power delivery system can sustain even high-end processors running at full load
- Front USB Type-C allows gamers to be compatible with the latest PC chassis and perfect for external drives and other mobile devices
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LIGHTNING GEN 4 SOLUTIONThe latest Gen4 PCI-E and M.2 solution with up to 64GB/s bandwidth for maximum transfer speed. PCIe 4.0 maintains both backward and forward compatibility with older and newer specifications. |
EXTENDED HEATSINK DESIGNMetal extended heatsink enlarge the surface of heat dissipation, ensures even high-end processors to run in full speed. |
CORE BOOSTCore Boost technology combines MSI’s premium layout and digital power design which allows for faster and undistorted current delivery to the CPU at pin-point precision. Not only supporting multi-core CPU, but creating the perfect conditions for your CPU overclocking. |
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PCB WITH 2OZ THICKENED COPPERAn enhanced PCB design with 2oz thickened copper increases conductivity, improving heat dissipation and performance reliability especially during overclocking. |
EASY TO ARRANGE YOUR CABLESNot clever at cable arrangement? MSI Atypical PCB design not only the identity of stylish but also makes SATA and USB cable routing easier. Arranges cable neatly even you are not familiar with system build. |
STEEL ARMORSteel Armor has more solder points on the PCB for more strength and protects the PCI-Express signals against electromagnetic interference for a stutter-free user experience. |
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MAG B550 TOMAHAWK | MAG B550M MORTAR WIFI | MAG B550M MORTAR | MAG B550M BAZOOKA | B550-A PRO | B550M PRO-VDH WIFI | |
CPU | Support for 3rd Gen AMD Ryzen processors and future AMD Ryzen processors with BIOS update | Support for 3rd Gen AMD Ryzen processors and future AMD Ryzen processors with BIOS update | Support for 3rd Gen AMD Ryzen processors and future AMD Ryzen processors with BIOS update | Support for 3rd Gen AMD Ryzen processors and future AMD Ryzen processors with BIOS update | Support for 3rd Gen AMD Ryzen processors and future AMD Ryzen processors with BIOS update | Support for 3rd Gen AMD Ryzen processors and future AMD Ryzen processors with BIOS update |
Chipset | AMD B550 Chipset | AMD B550 Chipset | AMD B550 Chipset | AMD B550 Chipset | AMD B550 Chipset | AMD B550 Chipset |
Memory | 4 x DIMM; Max. 128GB DDR4; 4866+ MHz | 4 x DIMM; Max. 128GB DDR4; 4400+ MHz | 4 x DIMM; 4 x DIMM; Max. 128GB DDR4; 4400+ MHzMax. 128GB DDR4; 4400+ MHz | 4 x DIMM; Max. 128GB DDR4; 4400+ MHz | 4 x DIMM; Max. 128GB DDR4; 4400+ MHz | |
PCIe x16 Slots | 1x PCIe 4.0 x16 slots (@x16) 1x PCIe 3.0 x16 slots (max.@x4) 2x PCIe 3.0 x1 slots | 1x PCIe 4.0 x16 slots (@x16) 1x PCIe 3.0 x16 slots (max.@x4) 2x PCIe 3.0 x1 slots | 1x PCIe 4.0 x16 slots (@x16) 1x PCIe 3.0 x16 slots (max.@x4) 2x PCIe 3.0 x1 slots | 1x PCIe 4.0 x16 slots (@x16) 2x PCIe 3.0 x1 slots | 1x PCIe 4.0 x16 slot (x16 / x4) 1x PCIe 3.0 x16 slot (max.@x4) 2x PCIe 3.0 x1 slots | 1x PCIe 4.0 x16 slots (@x16) 2x PCIe 3.0 x1 slots |
Graphics | HDMI, DisplayPort | HDMI, DisplayPort | HDMI, DisplayPort | HDMI, DisplayPort | HDMI, DisplayPort | HDMI, DisplayPort, VGA |
Audio | Audio Boost | Audio Boost | Audio Boost | Audio Boost | Audio Boost | Audio Boost |
32Gb/s M.2 | 1x 22110 (PCIe 4.0 x4 and SATA mode) 1x 2280 (PCIe 3.0 x4 mode) | 1x 2280 (PCIe 4.0 x4 and SATA mode) 1x 2280 (PCIe 3.0 x4 mode) | 1x 2280 (PCIe 4.0 x4 and SATA mode) 1x 2280 (PCIe 3.0 x4 mode) | 1x 2280 (PCIe 4.0 x4 and SATA mode) 1x 2280 (PCIe 3.0 x4 mode) | 1x 22110 (PCIe 4.0 x4 and SATA mode) 1x 2280 (PCIe 3.0 x4 mode) | 1x 2280 (PCIe 4.0 x4 and SATA mode) 1x 2280 (PCIe 3.0 x4 mode) |
Wireless | - | 2x2 Wi-Fi with MU-MIMO 802.11 a/b/g/n/ac/ax | - | - | - | 1x1 Wi-Fi 802.11 a/b/g/n/ac |
Mystic Light | Yes | N/A | N/A | N/A | N/A | N/A |
Form Factor | ATX | Micro ATX | Micro ATX | Micro ATX | ATX | Micro ATX |
Product information
Technical Details
Additional Information
ASIN | B08BCQF1BD |
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Customer Reviews |
4.5 out of 5 stars |
Best Sellers Rank | 16,806 in Computers & Accessories (See Top 100 in Computers & Accessories) 59 in Motherboards |
Date First Available | 17 Jun. 2020 |
Warranty & Support
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Reviewed in the United Kingdom on 27 July 2021
Top reviews from United Kingdom
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After a month of building my PC this B550 motherboard is very good especially because of the price.
If you have a £1000-£1200 PC budget i highly recommend this
Pros: Lots of fan headers and RGB ones
Bios is very easy to navigate
Looks very good in my case
Cons: The only worry I had when building this is I had to troubleshoot my ram which was the corsair 16GB rgb vengeance ones where both stick of ram worked but the motherboard didn’t boot when I wanted to do dual channel. However if you have the same situation don’t panic i have a solution:
First boot with any of the one stick of ram into A2
Then go into the bios
If XMP is disabled enable it but if it already is, disable and enable.
Once enabled turn off the PC and put the 2nd 8GB in and BOOM it should work :)
Hope it helps with any inconveniences

By Johnson N on 27 July 2021
After a month of building my PC this B550 motherboard is very good especially because of the price.
If you have a £1000-£1200 PC budget i highly recommend this
Pros: Lots of fan headers and RGB ones
Bios is very easy to navigate
Looks very good in my case
Cons: The only worry I had when building this is I had to troubleshoot my ram which was the corsair 16GB rgb vengeance ones where both stick of ram worked but the motherboard didn’t boot when I wanted to do dual channel. However if you have the same situation don’t panic i have a solution:
First boot with any of the one stick of ram into A2
Then go into the bios
If XMP is disabled enable it but if it already is, disable and enable.
Once enabled turn off the PC and put the 2nd 8GB in and BOOM it should work :)
Hope it helps with any inconveniences

Once the new Ryzen CPUs are out, I will do a bios update and upgrade to one of those CPUs.
I have temporarily installed a Ryzen 3 3100 until the new CPUs arrive. Along with 2x 8GB sticks of Corsair DDR4 3200mhz ram. (Edit Feb2021: Have put Ryzen 5 5600X in it now after updating bios to latest)
Definitely liking the build quality and look of the board.
It has 6 SATAIII ports which I need as I have a lot of storage drives, and still use my PCs Blu-ray drive. Also 2x M.2 slots, my boot drive is on a PCIe 4.0 nvme SSD in the top slot.
6x 4-pin system fan connectors, which is a good amount for my 5 case fans.
Has a Flash BIOS Button, always good to have.
EDIT Feb 2021:
I put the Ryzen 5 5600X in the motherboard last week, I needed to update the bios to the latest version first as I still had the first version that the board came with when I got it in September 2020. Updated fine and CPU is working as intended. The motherboard itself is still going great, had no problems at all with it.
There are plenty of headers and rear IO is decent. However, ethernet is 1G lan, not the 2.5G pictured. The only other small gripes are with the cheap IO shield - but minor considering it's out of sight, and the MSI bios mouse being a pain.
Overall, this is a well priced motherboard with a good lifespan ahead of it. I suspect it'll hold up well when paired with a future zen3 release. Thus, it comes down to whether you think the £20 or so extra over the b450 tomahawk or mortar - for added vrm capability (better support for next am4 release) and b550 chipset updates (pcie gen4 m.2 and gpu) - are worth it.
The replacement however had exactly the same problem. Assuming the bios might need updating, I did this in advance using the handy USB bios update button. The bios seemed to update fine, but I still got the CPU fault light.
I also played with the memory, ensuring it was in the correct slots - trying with none, one and then both sticks and the CPU light stayed on.
Fed up with trying to figure this out, I reinstalled my original motherboard using EXACTLY THE SAME components and it of courses booted first time.
If you have a Ryzen 3000 series CPU, I'd be cautious with this board.