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

Ships from United States.

Sold and Shipped by Newegg

Purchases from these Sellers are generally covered under our Newegg Marketplace Guarantee.
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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
EXCLUSIVE FEATURES
B550-A PRO motherboard
icon-core_boost
Flash BIOS Button

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

icon-core_boost
Core Boost Technology

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

icon-2oz_thickened
2oz Thickened Copper PCB

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

icon-digital_pwm
Digital PWM

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

icon-steel_armor
PCIe Steel Armor

Reinforced and shielded PCIe slots for strength and stability.

B550-A PRO
PREMIUM THERMAL SOLUTION
B550-A PRO motherboard
icon-k7
7W/mK Thermal Pad

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

icon-extended_heatsink
Extended Heatsink

Larger heatsink design for cooling and performance.

icon-pump_fan
Pump Fan Support

Control watercooling pump speeds for flowrate and noise control.

icon-m_2_shield
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
HIGH-SPEED TRANSMISSION
B550-A PRO wifi motherboard
icon-turbo_usb
Turbo USB

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

icon-m_2_shield_frozr
DDR4 Boost

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

icon-lightning
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

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
10 +2 +1 DUET RAIL POWER SYSTEM

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
EXTENDED HEATSINK

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
PCB WITH 2OZ THICKENED COPPER

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

the usb_type of the motherboard
USB TYPE-C READY - REAR IO & FRONT CASE PANEL SUPPORT

Effortlessly plug in devices with reversible USB Type-C.

LIGHTNING GEN4 of the motherboard
LIGHTNING GEN4 M.2 WITH M.2 SHIELD FROZR

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
LIGHTNING GEN 4 SOLUTION

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
UNMATCHED MEMORY PERFORMANCE

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
EASY TO ARRANGE YOUR CABLES

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

detail of the connection of the video
MULTIPLE GPU SUPPORT AND STEEL ARMOR

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 Newegg.com's Standard Return Policy.
Ownership: 1 week to 1 month
Verified Owner
2/ 5
Ok motherboard with decent specs but DOA 9/27/2020 7:42:10 AM

Pros: - always liked msi products so I decided to go with one of their motherboards for my first AMD build.
- Bought a new msi board and it works great

Cons: - DOA
- Motherboard would not post
- Wasted hours trouble shooting (swapping PSUs, ram, installing buzzer, checking forums, and re seating all the cables, clearing CMOS) I had thought I did something's wrong considering it was my first time working with a Ryzen rig.
- Only came with a quick start guide for instructions (not sure if this is normal or not)

Overall Review: - I'm sure if it worked it would have been a decent board
- Ended up getting a msi x570 board to replace it/ check to make sure It wasn't a bad cpu
- I'll be trying to return this motherboard to newegg hopefully all goes well.

Did you find this review helpful?
Anonymous
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Awesome And Fast Delivery 9/25/2020 7:16:16 AM

Pros: The delivery guy was very nice and respectful the package came nice and fast

Overall Review: Very Great Job

Did you find this review helpful?
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Great product would recommend 9/17/2020 6:59:17 AM

Pros: The style is beautiful
extremely fast board
perfect to fit great amounts of ram
has everything you need

Overall Review: great product 10 out of 10!

Did you find this review helpful?
Ownership: 1 week to 1 month
Verified Owner
4/ 5
Great Product Overall 9/9/2020 8:22:05 PM

Pros: I find the product very good. Exceptional computer part for my custom build. Love the look to the motherboard.

Cons: Was placed onto of my garbage can outside my house, instead of on my porch. Found that very vexing, for it could have been severely damaged if I had not realized it was delivered.

Overall Review: I would recommend this product to anyone building their computers. I just believe that I had got unlucky with my delivery.

0 out of 1 people found this review helpful. Did you?
Manufacturer Response:
Dear Valued Customer,

Thank you for sharing your experience with the MSI motherboard! 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
Anonymous
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Great Mobo! Easy to install 9/5/2020 6:42:53 PM

Overall Review: Easy to install for first time builder! Runs great!

0 out of 1 people found this review helpful. Did you?
Manufacturer Response:
Dear Valued Customer,

Thank you for rating the MSI motherboard! 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 month to 1 year
Verified Owner
1/ 5
Defective (DOA) 9/4/2020 9:23:36 AM

Overall Review: Unfortunately, I got this board dead on arrival.

1 out of 3 people found this review helpful. Did you?
Anonymous
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Do what it do 9/1/2020 7:17:10 AM

Pros: Visually appealing all black is nice.
Good price for what you’re getting

Overall Review: Good quality good price

0 out of 1 people found this review helpful. Did you?
Manufacturer Response:
Dear Valued Customer,

Thank you for rating the MSI motherboard! 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 week to 1 month
Verified Owner
5/ 5
My first "gaming" motherboard 8/29/2020 1:05:36 PM

Pros: Good looking board. Feels well made compared to my previous board.

Cons: It is easy to miss the flaps of metal on the IO shield, so when I first installed this motherboard and fired it up, I went to put in my ethernet cable only to realize that the flap of metal went inside the port. I had to take the motherboard back out and make sure all the pieces of metal went along side the ports, instead of in them.

Overall Review: My past few computers were pre-built machines I caught on special. My motherboard died on my most recent one and while looking into replacements, I realized I'd have to upgrade the processor as well, so I picked this motherboard to upgrade to a Ryzen 7 3700x. I like the look of it. This is my first motherboard with NVMe slots, so I'm eager to install one or two. I was rushing to put everything together, but it wasn't clear which spots on the motherboard were for USB 2 & 3. It's possible in my rush I just didn't pay enough attention.

1 out of 1 people found this review helpful. Did you?
Manufacturer Response:
Dear Valued Customer,

Thank you for rating the MSI motherboard! 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
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