Unmatched efficiency with PRO Series Introducing the all new B550M-A PRO Motherboard from MSI. The MSI B550 motherboard supports the 3rd Gen AMD Ryzen processors with the addition of PCIe 4.0 technology for eye watering speeds, MSI DDR4 and Core Boost technologies which incorporate a premium layout and digital power design to squeeze every ounce of performance from your components and provide better overall performance and stability, 2oz copper PCB to help with additional thermal dissipation. PRO series motherboards help users work smarter by delivering an efficient and productive experience. Featuring stable functionality and high-quality assembly, PRO series motherboards provide not only optimised professional workflows but also less troubleshooting and longevity.
AMD B550 Chipset
AM4 CPU Socket
M-ATX Form Factor
Business Elegance with the B550M PRO VDH
Core Boost Technology With premium layout design, that is ready for unleashing the maximum performance.
4K Support Onboard HDMI supports up to 4K UHD resolution.
Audio Boost Reward your ears with studio grade sound quality for the most immersive gaming experience.
PCIe Steel Armor Protecting VGA cards against bending and EMI for better performance, stability and strength.
2oz Thickened PCB An enhanced PCB design improves heat dissipation and performance reliability.
Lightning Gen 4 Solution The latest Gen4 PCI-E and M.2 solution with up to 64GB/s bandwidth for maximum transfer speeds.
DDR4 Boost The fully isolated DDR circuit to deliver pure data signals for the best performance and stability.
Experience Core Boost
faster and undistorted current delivery core 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 CPUs, but also creating the perfect conditions for CPU overclocking allowing you to always get the most from your 3rd generation AMD Ryzen Processor.
Give yourself a Lightning Fast Experience
LIGHTNING GEN 4 PCI-E MSI lightning Gen 4 PCI-E is the latest and the fastest PCI-E data transfer solution with 64GB/s of unidirectional transfer bandwidth that has doubled compared to its previous generation. PCIe 4.0 maintains both backward and forward compatibility with older and newer specifications. Optimised by steel armor design and server grade PCB, you can enjoy next-gen devices without any compromise.
Unmatched Memory Performance
Advanced performance with DDR4 BOOST MSI motherboards are crammed with features to fuel your system’s memory with more speed, higher overclockability and increased stability. The technical enhancements of DDR4 Boost allow for more stability at higher memory speeds compared to other brands. Enjoy the additional boost in operational performance or when working with large video and photography files. MSI conducts thorough memory testing with the most popular memory brands under extreme conditions to ensure your system runs stable no matter what.
Protecting your PCIe Slots
FORTIFY YOUR SYSTEM WITH PCI-E STEEL ARMOR MSI PCI Express Steel Armor slots are secured to the motherboard with extra solder points and support the weight of heavy graphics cards. When every advantage in games counts, Steel Armor shields the point of contact from electromagnetic interference.
Professional Gaming Audio
Amplify your game with Audio Boost MSI Audio Boost delivers the highest sound quality through the use of premium quality audio components. This lets you enjoy breathtaking, game-changing sound to create the most dynamic soundscapes dedicated to giving gamers true Hi-Fi sound offering a clear advantage over your opponents when gaming. Audio Boost offers a HD audio processor, dedicated amplifier and high quality audio capacitors, all physically isolated from the rest of the motherboard circuitry to ensure the purest audio signal to locate enemies with pin-point accuracy.
CPU Socket Socket AM4
CPU Brand AMD
Installed Processors (Max) 0 (1)
Supported Processor Manufacturer AMD
Supported Processors AMD Ryzen 5000 & 3000 Series desktop processors (not compatible with AMD Ryzen 5 3400G & Ryzen 3 3200G) and AMD Ryzen 4000 G-Series desktop processors
64-bit Support Yes
Rear Panel I/O Ports
USB Ports 4 x USB 3.02 x USB 2.0
HDMI Port 1 x HDMI 2.1
Keyboard Port 1 x PS/2
Mouse Port 1 x PS/2
RJ-45 Ports 1 x RJ-45
Digital Port 1 x DVI-D
Audio Line In Ports 1 x 3.5mm Jack
Audio Line Out Ports 1 x 3.5mm Jack
Microphone In Port 1 x 3.5mm Jack
Internal I/O Connectors
SATA Connectors 4 x SATA III
USB Connectors 1 x USB 3.0 header (supports 2 ports)2 x USB 2.0 headers (supports 4 ports)
Front Panel Connectors 1 x Front Panel1 x Front Audio
Cooling Fan Support 1 x CPU fan header1 x System fan header
Chassis Intrusion Connector 1 x Chassis Intrusion header
TPM Header 1 x TPM header
Power Connector Port 1 x 20 4-pin ATX1 x 4-pin EPS
Other Connectors 1 x M.2, Socket 3, M Key (Type 2242/2260/2280)
Memory Bus Speed 1866/ 2133/ 2400/ 2667/ 2800 /2933 /3000 /3066 /3200 /3466 /3600/ 3733 /3866 /4000 /4133 /4266 /4400/ 4600 MHz
Memory Type DDR4
Maximum RAM 64 GB
Memory Slot 2 x DIMM
Chipset Manufacturer AMD
RAID Supported Yes
RAID Format RAID 0, 1, 10
SATA Supported Yes
Number of PCI Express Slots 1 x PCI Express 4.0 x161 x PCI Express 3.0 x1
Integrated Graphics Supported Yes
Integrated Sound Realtek ALC892/ALC897
Warranty 3 Years
Integrated Network Realtek RTL8111H
Network Speeds Supported Up to 1 Gbps
Wireless LAN No
Operating Systems Supported Microsoft Windows 10 64-bit
Jumpers 1 x Clear CMOS
Software Included (may be trial or restricted) Yes
Form Factor MicroATX Motherboard
In The Box B550M-A PRO MotherboardQuick Installation GuideMSI Case Badge2 x SATA CablesProduct Registration CardI/O ShieldDriver DVDPromotion Card
Width 236 mm
Length 200 mm
Wireless Network No
Memory Channel Dual
On-board Audio Type 7.1
Number of SATA Ports 4 port(s)
Number of USB Ports 6 port(s)
SATA III Support Yes
USB 3.0 Support Yes
Multi GPU Support No
VGA Connection No
DVI Connection Yes
HDMI Connection Yes
DisplayPort Connection No
Motherboard Form Factor mATX
Motherboard Power Connectors 4-Pin
Motherboard Chipset AMD B550
Motherboard Model MSI B550M-A PRO
USB 3.1 Support No
Internal USB3.0 Header Yes
M.2 Support Yes
On-board RGB Control None
Memory Speed 4600 MHz
RGB Header Type None
Addressable RGB No