MSI B550-A Pro, AMD, Socket AM4, AMD Ryzen 3 3rd Gen, 3rd Generation AMD Ryzen 5, 3rd Generation AMD Ryzen 7, 3rd Generation AMD..., DDR4-SDRAM, DIMM, 1866,2133,2400,2667,2800,2933,3000,3066,3200,3466,3600,3733,3866,4000,4133,4266,4400,4800 MHzPRO series helps users work smarter by delivering an efficient and productive experience. Featuring stable functionality and high-quality assembly, PRO series motherboards provide not only optimized professional workflows but also less troubleshooting and longevity.
USER FRIENDLY DESIGNMSI motherboards feature tons of convenient and smart design for DIY users, countless system tuning and troubleshooting tools are at your disposal to push your system to new heights and satisfy even the most demanding tweaker. Makes it so easy to install your own motherboard without any issue.
THERMAL SOLUTION FOR MORE CORES AND HIGHER PERFORMANCEWith more cores’ processors, thermal and power design is more important to make sure the temperature keeps lower. MSI extended PWM heatsink with 7W/mK thermal pad ensures even high-end processors to run in full speed with MSI motherboards.
M.2 SHIELD FROZRWorld’s fastest SSDs can start to lower performance when getting hot. Part of the motherboards heatsink design, M.2 SHIELD FROZR is the next generation M.2 thermal solution to avoid this by offering the best thermal protection to make sure that SSD maintains maximum performance.
FULLY CONTROLLABLE IN BIOS AND SOFTWAREMSI motherboards let you manage speeds and temperatures for all your system and CPU fans. Total Fan Control allows you check your primary system characteristics in a simplified graphical interface. You can also set up to 4 temperature targets for CPU and motherboard, which will adjust the fan speeds automatically.
OPTIMIZED FOR WATER COOLINGDesigned to support the most popular All-In-One & customized water cooling solutions on the market. A dedicated water pump PIN header supports up to 3 amp, giving you full control of the water pump speed. A clearly marked ‘keep-out-zone’ allows for easy and safe installation and a perfect fit.
EASY BIOS RECOVERY WITH FLASH BIOS BUTTON
Run into trouble when updating your BIOS? Simply flash the old BIOS version back and continue working within minutes with Flash BIOS Button. Flash BIOS Button even works without a CPU, memory or graphics card installed!
EZ DEBUG LEDRun into trouble? Onboard LEDs for key components will indicate the source of the problem so you know exactly where to look to get up and running again.
XL CLIPThe enlarged PCI-E clip helps you swap or remove your devices easier. Keep the PCI-E slot stronger and safer.
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.
FORTIFY YOUR SYSTEM WITH PCI-E STEEL ARMORMSI 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.
ULTIMATE MOTHERBOARD PROTECTIONDouble ESD protection doubles up the grounding layer around the mounting holes, preventing static discharge surges from damaging the motherboard.
CONNECTIVITYThe most important thing of DIY is expandability. MSI PRO series motherboards feature plenty possibility for prosumers’ need. Stable LAN, faster storage and USB transfer speed and other expandable connectors are ready to enlarge your flexibility.
FAST AND FUTURE-READY STORAGEMSI PRO series motherboards support all the latest storage standards, which allows users to connect any ultra-fast storage device. Higher efficiency makes your work easier.
LIGHTNING GEN 4 M.2Utilizing 3rd Gen Ryzen processors, MSI B550 motherboards feature latest Lightning Gen 4 M.2 which is the fastest onboard storage solution on the market with up to 64 Gb/s transfer speed.
MAXIMIZE YOUR USB DEVICE PERFORMANCERead and write your files over USB faster than ever. MSI PRO series motherboards offer a wide variety of options to connect and boost your USB devices, delivering 10Gbps transferring speed by both USB 3.2 Gen 2 Type-A and Type-C.
USB FRONT TYPE-CMSI motherboards support USB Front Type-C that allows gamers to connect with the latest USB devices. Built up a system with MSI PC case to have the most convenient experience.
EXTEND YOUR RGB EXPERIENCE WITH EASEAdd your color if you want! Mystic Light Extension pin header provides an intuitive way to control additional RGB strips and other RGB peripherals added to a system, without needing a separate RGB controller.
EXPERIENCE MOREMSI PRO series motherboards are designed to satisfy any professional workflow. Elevate your listening pleasure and enjoy extreme sound quality. Moreover, with years of experience in creating performance enhancing tools that are easy to use, only the highest quality applications are at your disposal. The extensive features let you fine-tune your system to deliver reliable maximum performance.
PCB WITH 2OZ THICKENED COPPERAn enhanced PCB design with 2oz thickened copper increases conductivity, improving heat dissipation and performance reliability especially during overclocking.
10 + 2 + 1 DIGITAL POWER WITH DOUBLER DESIGNUnleash and sustain maximum performance with an aggressive VRM design built with a total of 10 phases Digital Power with Doubler Design. Combining exclusive Core Boost technology, PRO series motherboard is ready to sustain heavy daily work.
LIGHTNING GEN 4 PCI-EMSI 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. Optimized by steel armor design and server grade PCB, you can enjoy next-gen devices without any compromise.
A HUGE STEP OF DDR PERFORMANCEMSI OC LAB does not merely work hard on extreme overclocking. Compared to B450 motherboard memory A-XMP profile, MSI does have great improvement on performance and efficiency for B550 motherboards. Easy to enable A-XMP profile with auto power settings to get the best memory speed and stability.
CORE BOOSTCore Boost technology combines MSI's premium layout and optimized power design which allows for faster and undistorted current delivery to the CPU at pin-point precision. Not only supporting multi-core CPU, also creating the perfect conditions for your CPU overclocking.
DEDICATED HIGH DEFINITION AUDIO PROCESSORMake sure you enjoy the purest sound quality in both stereo and surround sound.
HIGH QUALITY AUDIO CAPACITORSA high fidelity sound experience with exceptional acoustics and realism for studio level headphones is ensured.
HD AUDIO CONNECTORSKeep you sound perfect by transmit your aduio with pure digital signal.
ISOLATED AUDIO DESIGNLike a dedicated sound card, audio components and circuits have been laid on a reserved motherboard section and electrically isolated.
SEPARATED AUDIO LAYERS FOR CLEAN LEFT & RIGHT CHANNELSUsing separated layers in the PCB ensures equally pristine sound quality for both left and right audio channels.
DRAGON CENTERMSI brand new Dragon Center unifies a suite of MSI software utilities into a single centralized application. Take control of advanced motherboards features and unleash endless possibilities.
CLICK BIOS 5Get more from a loaded BIOS designed for ease of use. Fine-tune the motherboard for gaming performance, efficiency, or overclocking world records!
CREATOR GENIE
Quickly overclock your CPU with a single button for more performance.
A-XMP
Choose from a preset A-XMP profile and automatically overclock compatible DDR memory.
M-FLASH
Conveniently flash or upgrade the BIOS in a few minutes from the CMOS Setup Utility.
HARDWARE MONITOR
Get immediate access to your critical hardware information in real-time including temperature, memory capacity, clock speed, and voltage.
MEMORY TRY IT
Get extreme speed out of your system memory and get more performance.
SEARCH & FAVORITES
A permanent search & favorite option in the top right corner moves you through the BIOS menus quickly.
| Processor |
|---|
| Processor manufacturer | AMD |
| Processor socket | Socket AM4 |
| Compatible processor series | AMD Ryzen 3 3rd Gen, 3rd Generation AMD Ryzen 5, 3rd Generation AMD Ryzen 7, 3rd Generation AMD Ryzen 9 |
| Maximum number of SMP processors | 1 |
| Memory |
|---|
| Supported memory types | DDR4-SDRAM |
| Number of memory slots | 4 |
| Memory slots type | DIMM |
| Supported memory clock speeds | 1866,2133,2400,2667,2800,2933,3000,3066,3200,3466,3600,3733,3866,4000,4133,4266,4400,4800 MHz |
| Maximum internal memory | 128 GB |
| Memory channels | Dual-channel |
| ECC | Y |
| Non-ECC | Y |
| Storage controllers |
|---|
| Supported storage drive interfaces | Serial ATA III |
| Supported storage drive types | HDD & SSD |
| RAID levels | 0,1,10 |
| Graphics |
|---|
| Parallel processing technology support | 2-Way CrossFireX |
| Maximum graphics adapter memory | 16000 MB |
| Maximum resolution | 4096 x 2160 pixels |
| Internal I/O |
|---|
| USB 2.0 connectors | 2 |
| USB 3.2 Gen 1 (3.1 Gen 1) connectors | 1 |
| Number of SATA III connectors | 6 |
| Front panel audio connector | Y |
| ATX Power connector (24-pin) | Y |
| CPU fan connector | Y |
| Number of chassis fan connectors | 6 |
| Chassis intrusion connector | Y |
| TPM connector | Y |
| 12V power connector | Y |
| RGB LED pin header | Y |
| Rear panel I/O ports |
|---|
| USB 2.0 ports quantity | 4 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 2 |
| USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity | 1 |
| USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity | 1 |
| Ethernet LAN (RJ-45) ports | 1 |
| PS/2 ports quantity | 1 |
| HDMI ports quantity | 1 |
| DisplayPorts quantity | 1 |
| Network |
|---|
| Ethernet LAN | Y |
| Wi-Fi | N |
| Ethernet interface type | Gigabit Ethernet |
| LAN controller | Realtek 8111H |
| Features |
|---|
| Component for | PC |
| Motherboard form factor | ATX |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B550 |
| Audio output channels | 7.1 channels |
| Audio chip | Realtek ALC892 |
| Number of mounting holes | 9 |
| Expansion slots |
|---|
| PCI Express x1 (Gen 3.x) slots | 2 |
| PCI Express x16 (Gen 3.x) slots | 1 |
| PCI Express x16 (Gen 4.x) slots | 1 |
| Number of M.2 (M) slots | 2 |
| BIOS |
|---|
| Clear CMOS jumper | Y |
| Weight & dimensions |
|---|
| Width | 305 mm |
| Depth | 244 mm |
| Packaging content |
|---|
| Cables included | SATA |
| Drivers included | |
