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MSI PRO B550-A PRO AM4 AMD B550 SATA 6Gb/s ATX AMD Motherboard

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  • AMD B550
  • Supports AM4 socket 3rd Gen AMD Ryzen processors, and future AMD Ryzen processors with BIOS update.
  • Supports DDR4 3200/ 3066/ 3000/ 2933/ 2800/ 2667/ 2400/ 2133/ 1866 MHz by JEDEC
  • Supports DDR4 4400+/ 4266/ 4133/ 4000/ 3866/ 3733/ 3600/ 3466/ 3200/ 3066/ 3000/ 2933/ 2800/ 2667 MHz by A-XMP OC MODE
  • 1DPC 1R Max speed 4800 MHz
  • 1DPC 2R max speed 3866 MHz
  • 2DPC 1R max speed 4000 MHz
  • 2DPC 2R max speed 3600 MHz

  • Overview
  • Specs
  • Warranty & Returns
  • Reviews
B550-A PRO
B550-A PRO motherboard
Flash BIOS Button

Use a USB drive to flash the BIOS even without a CPU or memory.

Core Boost Technology

An optimized power circuit layout is ready to unleash maximum performance.

2oz Thickened Copper PCB

An enhanced PCB material design improves heat dissipation and high-performance capabilities.

Digital PWM

A selection of the highest quality power delivery components lets the system run reliably even under extreme conditions.

PCIe Steel Armor

Reinforced and shielded PCIe slots for strength and stability.

B550-A PRO
B550-A PRO motherboard
7W/mK Thermal Pad

Premium 7W/mK thermal pad covers both the MOSFET and chokes while providing better heat transfer to the heatsink.

Extended Heatsink

Larger heatsink design for cooling and performance.

Pump Fan Support

Control watercooling pump speeds for flowrate and noise control.

M.2 Shield Frozr

Sustain maximum high-speed M.2 SSD data transfer with M.2 SHIELD FROZR and prevent SSD thermal throttling.

B550-A PRO
B550-A PRO wifi motherboard
Turbo USB

Featuring TURBO USB 3.2 GEN 2 10Gbps with reversible Type-C connector.

DDR4 Boost

The memory circuit design has been optimized on a reserved section of the motherboard fully isolated from other circuits.

Lightning Gen 4 Solution

Transfer data lightning fast across Gen 4 PCI-E and M.2 with up to 64GB/s bandwidth.

core boost of motherboard

Core Boost combines a reserved zone of optimized circuits and premium power delivery components to create a highly efficient power system capable of precise current output to the CPU.

the ports of the motherboard

Unleash and sustain maximum performance with an aggressive VRM design built to supply stable and steady power delivery.

  • 10 phase Duet Rail Power System
  • 2 phase SOC Power
  • 1 phase APU Power
  • Digital PWM IC
extedned  heatsink of the motherboard

An all-metal extended heatsink cover enlarges the heat dissipation surface allowing the CPU power system to reliably drive multi-core processors.

the 2oz thickened copper of the motherboard

An enhanced PCB material design with 2oz thickened copper increases conductivity, improving heat dissipation and high-performance reliability.

the usb_type of the motherboard

Effortlessly plug in devices with reversible USB Type-C.

LIGHTNING GEN4 of the motherboard

Sustain maximum M.2 SSD data transfer with M.2 SHIELD FROZR. Prevent SSD thermal throttling with a heatsink that extends across the motherboard.

lightning_gen4 of the motherboard

Strike fast with MSI Lightning Gen 4 PCI-E. Attach ultra fast PCI-E 4.0 devices and enjoy up to 64GB/s unidirectional transfer bandwidth.

a chart showing different effect between DDR4 BOOST and OTHERS

MSI takes memory stability and performance to the extreme. We've designed an optimized memory circuit design for reliability and tested compatibility extensively in partnership with major memory manufacturers.

port of the motherboard

Tuck away SATA and USB cables neatly with MSI Atypical PCB edge.

detail of the connection of the video

B550-A PRO supports AMD CrossFire multi GPU technology. PCI-E slot placements provide optimal airflow for graphics card cooling.

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 counts, Steel Armor shields the point of contact from electromagnetic interference.

Learn more about the MSI B550-A PRO

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years
  • Read full details
  • Return Policies
    • Return for refund within: 30 days
    • Return for replacement within: 30 days
  • This item is covered by's Standard Return Policy.
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Good motherboard, good price for what you get. 8/7/2020 11:15:46 AM

Pros: USB-C Header
Good rear I/O
Plenty of SATA ports
2 M.2 slots
Top M.2 slot has a heatsink, which is nice.

Cons: Front panel USB-C port does not work. I'll be looking into if I can get it to work, but I think overall this still deserves 5 stars.

Overall Review: I would reccomend this motherboard and I would buy it again if I needed to.

Did you find this review helpful?
Ownership: 1 week to 1 month
Verified Owner
3/ 5
Bad am4 slot 8/5/2020 10:37:09 PM

Cons: Msi support is not the greatest no response from calling and the support messages dodnt work. Newegg was a helpful place.

Overall Review: Did not work with the cpu installed so i had to send a RMA hoping that when i get a fresh board it is fully functional hoping for the best wihtholding with this 3 egg review. Will make another review after i recieve a functional board. Thank you for having better support than MSI.

Did you find this review helpful?
Ownership: 1 week to 1 month
Verified Owner
2/ 5
Got a bad board 7/28/2020 12:22:47 PM

Cons: This would have been a great board but would not power up out of the box. Sent it back. And went and bought another board local so I could build my system. Still waiting on refund been a week so I would still be using my old brick.

Overall Review: I think it would have been a great board if it had worked

Did you find this review helpful?
Manufacturer Response:
Dear Valued Customer,

Thank you for sharing your experience with the MSI motherboard. We are sorry to hear you are experiencing a problem with the product. If you have any further questions regarding this product or have any suggestions for improvement for us, please do not hesitate to contact us directly at and we will be more than happy to assist you. If you would like further technical assistance, please feel free to contact our technical support department directly at 626.271.1004 from M to F, 9am to 6pm Pacific Standard Time.

Thanks for choosing MSI!

Best Regards,
MSI Review Team
Ownership: 1 day to 1 week
Verified Owner
5/ 5
Solid MOBO so far 7/21/2020 8:51:56 AM

Pros: -Easy debugging LED lights for troubleshooting POST failures
-Very sleek but not to flashy design
-Worked with my 3rd gen AMD Ryzen processor without the need for a BIOS update

Cons: -The only real quirk I have noticed is occasionally the debug LEDs can get stuck in the lit up state even after a successful POST and boot into windows. I dont know what causes this to happen but 99% of the time they work as intended.

Overall Review: MSI has never failed to deliver a quality product in my experience. I have used their boards in my PC for 6 years and counting without any problems. If it weren't for the fact I wanted to switch to an AMD processor and DDR4 RAM id still be using my old board.

2 out of 2 people found this review helpful. Did you?
Manufacturer Response:
Dear Robert,

Thank you for sharing your experience with the B550-A PRO motherboard! If you ever require technical assistance or warranty support, please feel free to contact our technical support department directly at 626.271.1004 from M to F, 9am to 6pm Pacific Standard Time.

Thanks for choosing MSI!

Best Regards,
MSI Review Team
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