Brand | MSI |
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Product Dimensions | 30.48 x 3.81 x 24.38 cm; 1.3 Kilograms |
Item model number | 7C91-001R |
Manufacturer | MSI COMPUTER |
Series | MAG B550 TOMAHAWK |
Color | Black |
Form Factor | ATX |
Processor Type | Ryzen 9 |
Processor Socket | Socket AM4 |
Memory Technology | DDR4 |
Computer Memory Type | DDR4 SDRAM |
Maximum Memory Supported | 128 GB |
Memory Clock Speed | 4866 MHz |
Graphics Card Interface | PCI Express |
Wireless Type | 5 GHz Radio Frequency, 2.4 GHz Radio Frequency |
Number of USB 2.0 Ports | 2 |
Are Batteries Included | No |
Item Weight | 1.3 kg |
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MSI MAG B550 TOMAHAWK Motherboard ATX - Supports AMD Ryzen 3rd Gen Processors, AM4, DDR4 Boost (4866MHz/OC), 1 x PCIe 4.0 x16, 1 x PCIe 3.0 x16, 2 x M.2, HDMI, 2.5G LAN
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- Free returns are available for the shipping address you chose. For a full refund with no deduction for return shipping, you can return the item for any reason in new and unused condition.
- Learn more about free returns.
- Go to your orders and start the return
- Select the return method
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Enhance your purchase
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 | 4866 MHz |
Platform | Windows 10 |
Series | MAG B550 TOMAHAWK |
CPU model | Ryzen 9 |
Memory storage capacity | 128 GB |
About this item
- Make sure this fits by entering your model number.
- Powered by 3rd generation AMD Ryzen 9, Ryzen7, Ryzen 5 AM4 to maximize connectivity and speed with dual M.2, PCIe 4.0, USB 3.2 Gen2 and up to 128 GB of DDR4 (4886 MHz)
- Dual LAN includes 2.5G and Gigabit LAN to provide a great networking performance and online gaming experience
- With 3rd Gen Ryzen processors, this motherboard features the latest Lightning Gen 4 solution on both PCI-E and M.2 slot, which allow for faster data transfer on graphics cards, storage devices and networking devices
- Mystic Light provides a complete function to control the RGB light all around the system; it supports both RGB and RAINBOW LED strip, and 16.8 million colours/29 effects controlled in one click
- 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
- Pre-installed I/O Shielding provides better EMI protection and more convenience for installation
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Customer Rating | 4.7 out of 5 stars (6144) | 4.6 out of 5 stars (56) | 4.5 out of 5 stars (1866) | 4.5 out of 5 stars (534) | 4.5 out of 5 stars (3574) |
Price | £148.99 | £170.00 | £104.33 | £116.98 | £182.11 |
Sold By | Amazon.co.uk | Punch Technology | Amazon Warehouse | Amazon.co.uk | Amazon EU |
Are batteries required? | No | Yes | Yes | Yes | Yes |
CPU Model | Ryzen 9 | AMD Ryzen 7 | — | Unknown | — |
Graphics Card Interface | PCI Express | PCI Express | PCI Express | Integrated, AGP | PCI Express |
Memory Clock Speed | 4866 MHz | 5100 MHz | 4400 MHz | 4733 MHz | 3466 MHz |
Memory Speed | 4866 MHz | 5100 MHz | 4400 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.
MAG B550 TOMAHAWK
Advancing Ascension
Experience the new generation of the MAG B550 TOMAHAWK motherboard powered by 3rd Gen AMD 3000 series AM4 processors. Outperform your system's potential with 2.5G LAN plus Gigabit LAN. 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 Gen 4 M.2, PCIe 4.0, USB 3.2 Gen 2x2
- Mystic Light provides a complete function to 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. |
ENHANCED THERMAL SOLUTIONHigher performance generates more heat. Thermal solution is very important to B550 chipset which featured latest Gen4 bandwidth. MSI motherboards featured extended heatsink, 7W/mK level thermal & choke pad, 2oz thickened copper and M.2 Shield Frozr to provide best performance for enthusiast gamers and prosumers. |
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. This creates the perfect conditions for multi-core CPU while doing. |
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USB TYPE-C READY IN BOTH FRONT CASE PANEL & REAR IOGet all the performance benefits from the USB Type-C connector. This reversible USB connector allows for effortless connecting of USB devices. |
MAXIMIUM DATA TRANSFER WITH 2.5G Plus Gigabit t LANFeatures high-bandwidth and low-latency Ethernet networks for demanding creators and power users. Onboard 2.5Gbps plus Gigabit LAN connectivity provides incredible data transfer speed faster than ever before. MSI LAN Manager automatically classifies and prioritises the latency-sensitive for your applications, giving you the best online experience with low latency. |
PRE-INSTALLED IO SHIELDINGFeaturing the pre-installed IO shielding, makes your installation process easier and safer. The patent design protect your IO ports also prevent electrostatic discharge damage, makes your motherboard a strong gaming foundation. |
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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 | B08B4V583Q |
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Customer Reviews |
4.7 out of 5 stars |
Best Sellers Rank | 1,865 in Computers & Accessories (See Top 100 in Computers & Accessories) 3 in Motherboards |
Date First Available | 2 Jun. 2020 |
Warranty & Support
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Reviewed in the United Kingdom on 17 July 2020
Top reviews from United Kingdom
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Sadly, mine doesn't (it won't POST). The board is too new for any advice or troubling shooting hints to be available on the interwebs or the forums which means you are stuck using MSI support which is not a pleasant or productive experience. It has EZDebug lights (you can see one lit just above the 24pin connector) which you would think were there to help work out what was going wrong, but alas... nobody seems to know what they actually mean. The BIOS is being activley worked on which is normally a good sign, it went from Beta 13 to A1 during the week, but there are no changelogs that I can find which doesn't help.
I tried to RMA the board through MSI but they are not playing ball so I am just going to have to return it to Amazon and get something else instead.

By Paul Smith on 17 July 2020
Sadly, mine doesn't (it won't POST). The board is too new for any advice or troubling shooting hints to be available on the interwebs or the forums which means you are stuck using MSI support which is not a pleasant or productive experience. It has EZDebug lights (you can see one lit just above the 24pin connector) which you would think were there to help work out what was going wrong, but alas... nobody seems to know what they actually mean. The BIOS is being activley worked on which is normally a good sign, it went from Beta 13 to A1 during the week, but there are no changelogs that I can find which doesn't help.
I tried to RMA the board through MSI but they are not playing ball so I am just going to have to return it to Amazon and get something else instead.

I ended up ordering a case, a motherboard, some ram, a CPU and an SSD.
The motherboard I chose was the MSI B550 gaming edge WiFi, a board which is virtually a twin of their B550 tomahawk. As far as I can tell, the only real difference is one less Lan port with WiFi/Bluetooth instead, and one less heatsink for the nvme ssd. The fact that the WiFi/Bluetooth is integrated on the board is enough for me to choose this over its twin. Even the normal price premium for the gaming edge WiFi is a non issue, because they're the same here on Amazon, or they were when I looked.
The actual board is well laid out, and only the techies or nerds will worry about the way the PCI lanes are arranged less than optimally for the i/o. The RGB on the chipset heatsink is present, but rather understated. And if bling is your thing, both 3 and 4 pin connectors for ARGB and RGB are present and the results can be controlled by the motherboard software, Dragon center(yes spelt with "er").
Well recommended for those who want a nice AMD mobo, with a bit more upgrade path left in it, overclock abilities and bling. And for those like me who have an ancient current PC, but have a bit of common sense about plugging things together.