MSI B550-A PRO ProSeries Motherboard (AMD Ryzen 5000, AM4, DDR4, PCIe 4.0, SATA 6Gb/s, M.2, USB 3.2 Gen 2, HDMI/DP, ATX)
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FREE refund/replacement until Jan 31, 2026 Learn more
FREE refund/replacement until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2026
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Availability:
Only 2 left in stock, order soon!
Arrives
Wednesday, Dec 24
Style: MSI B550-A PRO ProSeries Motherboard
Features
- Support for 3rd Gen AMD Ryzen processors and future AMD Ryzen processors with BIOS update.Audio ports (Rear) : Realtek ALC892/ALC897 Codec
- Supports dual channel DDR4 memory up to 128 GB (4400 MHz)
- Lightning Fast Game experience: PCIe 4.0, Lightning Gen 4 M.2 with M.2 Shield Frozr, AMD Turbo USB 3.2 GEN 2
- Core Boost technology combines optimized power circuit layouts and digital power regulation which allows for precise and steady current delivery to the CPU
- AUDIO BOOST rewards your ears with studio grade sound quality for immersive gaming experiences
- Premium Thermal Solution: Heatsink thermal pad rated for 7W/mk and PCB with 2oz thickened copper
- Flash BIOS Button lets users flash the BIOS even without a CPU or memory
- Powerful Design: Core Boost, Digital PWM IC, 2oz Thickened Copper PCB, Creator Genie, DDR4 Boost
Description
Powered by AMD Ryzen AM4 processors, the MSI B550-A PRO combines stable functionality and high-quality assembly to solve professional workflows. Extended Heatsink Design and Core boost keep critical components operating reliably. PCIe 4.0 slots and M.2 with Shield Frozr provides the latest in device connectivity.
Brand: msi
CPU Socket: Socket AM4
Compatible Devices: Personal Computer
RAM Memory Technology: DDR4
Compatible Processors: RYZEN 9
Chipset Type: AMD B550
Platform: Windows 10
Model Name: B550-A PRO ProSeries
CPU Model: AMD Ryzen 7
Memory Storage Capacity: 128 GB
Processor: amd_ryzen_7
RAM: DDR4
Number of USB 2.0 Ports: 2
Brand: msi
Series: B550-A PRO ProSeries
Item model number: B550-A PRO
Item Weight: 3.31 pounds
Product Dimensions: 12 x 9.6 x 1.5 inches
Item Dimensions LxWxH: 12 x 9.6 x 1.5 inches
Number of Processors: 1
Computer Memory Type: DDR4 SDRAM
Voltage: 1 Volts
Manufacturer: MSI
Date First Available: June 16, 2020
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Dec 24
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Style: MSI B550-A PRO ProSeries Motherboard
Reliable as the sun coming up in the morning. It just works very well. I will buy these forever. Their excellent in performance.
Reviewed in the United States on November 22, 2025 by Robert McLachlan
Style: MSI B550-A PRO ProSeries Motherboard
The MSI B550-A PRO is an excellent motherboard for anyone building a Ryzen-based PC, especially if you want solid performance without breaking the bank. Here’s why I’m impressed: Build Quality: The board feels sturdy with quality components and good cooling solutions, including extended heatsinks on the VRMs. This helps with stable overclocking and long-term reliability. Performance: It supports Ryzen 3000 and 5000 series CPUs flawlessly, with PCIe 4.0 support for faster NVMe SSDs and next-gen GPUs. I noticed fast boot times and smooth system responsiveness. Connectivity: Plenty of USB ports, including USB-C, multiple fan headers, and M.2 slots make this board very versatile. The Realtek LAN is reliable for stable wired connections. BIOS & Software: MSI’s BIOS is user-friendly and offers plenty of tweaking options for beginners and enthusiasts alike. The software suite is helpful for monitoring and system tuning. Value: Compared to other B550 boards, this one offers great features and solid performance at a competitive price. It’s perfect for midrange gaming rigs or workstations. Overall, if you want a dependable motherboard that won’t hold back your Ryzen CPU and offers future-proof features like PCIe 4.0, the MSI B550-A PRO is a smart choice. Highly recommended!
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Reviewed in the United States on August 8, 2025 by Kevin A.
Style: MSI B550-A PRO ProSeries Motherboard
Ease of installation compatibility
Reviewed in the United States on December 12, 2025 by Joanne Zertuche
Style: MSI B550-A PRO ProSeries Motherboard
This is a great, basic board. After a frustrating few days trying to get an ASRock Rack server board to even post, this dropped in like a breath of fresh air. Intuitive BIOS, awesome live tech support, etc. I plan to use MSI on my next build too.
Reviewed in the United States on October 12, 2025 by J. Huebner
Style: MSI B550-A PRO ProSeries Motherboard
I was going to update an MSI B450 mobo and put a 5800x in it but decided to upgrade to this B550 A-Pro. I figured since it's Gen 4 and has another M.2 slot it would be great. I was thinking it might need an update right out of the box for the 5800x, but really wasn't expecting the frustration ahead. All done with install, I pushed the power button and got the solid white cpu debug lite, and was locked out of even the bios screen. All fans spun, but no post, or video out to monitor. Then tried reseating ram, cpu, checking board power connectors, all w/no luck. Then researched and completed a no cpu bios flasback with latest bios. Thumbdrive flashed for a while then stopped, so I thought I licked it. Then I saw that it wasn't going to shut down for restart on it's own when it should have done so, so I forced shutdown. Long story short...after retrying posts unsuccessfully many times after bios flashing I had a 2700x on hand to install. No cpu debug now, but a vga one!!! Grrrrr..........I solved it by checking and reseating the power leads for the gpu, and it finally posted. Bios info confirmed the flash I did 4 hrs ago took, and was now up to date, but never posted until I put in the older cpu. Now...hear this M.S.I., both the B550 mobo and 5800x released at about the same time, in fact, about 6 mo. apart, so I shouldn't be having this issue. I then resolved to reinstall the 5800x on the chance of it working now, after the bios had got a full load-in and finalization. It did, thank God, 'cause if it hadn't it would've been disassembled and put right back in the box for RMA, despite the extra work and hassle. I've put together about 25 pc's but t his turned into THE MOST frustrating build for me, eating 12 hours of my day for the full build, when normal may be 4-6 hrs. It's been a few days and it's run perfectly fine since that mess, but I'll think twice about ordering another MSI mobo. Update 11-14-2024 Although I only gave 4 out of 5 rating at first, I would bump it up to a 4.75 if I could. Like many have said in reviews here, update the bios! The old BIOS that it shipped with really riled me up at the time, and luckily I had an old 2700x to get it to post before installing the 5800x. But I must say that after I got it running, finished set up and tweaked the settings, I haven't had any trouble at all. No crashes to speak of, and it's run beautifully. BIOS updates go smoothly and it now rocks a 5800x3d with the original 7900 XT gpu. It's turned out great, and I even went with another MSI mobo, a B650 Tomahawk Wi Fi. I'm happy with it now, but it also had it's issues, to say the least...like almost 2 minute post times. Google it. Most problems have smoothed out with BIOS updates now, but that's a whole other story in itself.
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Reviewed in the United States on September 7, 2023 by Wayne Conley Wayne Conley
Style: MSI B550-A PRO ProSeries Motherboard
The motherboard was easy to install in my existing system case upgrading the processor, memory, and dGPU. Installed a Ryzen 9 5900, 64GB DDR4-3200, 1TB M.2 2080 PCIe 4x4 SSD, and an RTX 4070 in one system. The other system was a Ryzen 9 3900, 32GB DDR4-3200, 512GB M.2 2080 PCIe3x4 SSD, and an RTX 4070. There's a heat-spreader for the M.2! It requires some patience on first boot since the FW seems to "think" a long time without writing to the screen, but it eventually came to the BIOS splash screen. I did update the BIOS to the latest version right away since the shipping version was outdated (may have been fine but why take chances). The BIOS update procedure is simple--just download, unzip to a connected drive, boot to the UEFI BIOS, go to update BIOS mode, reboot, and point to the BIOS file on the connected drive. The update process will finish up and the system will reboot. I did have to set the memory speed to the profile to support its speed--it did not automatically choose the correct JDEC/XMP profile for 1600MHz/3200MT/s. After installing Windows 11 Pro and my application/utility suites, the system has been stable through some very heavy use: transcoding videos with CPU and GPU using Handbrake, creating/editing videos using DaVinci Resolve, editing photos with Lightroom/ACR/Photoshop, and running a range of development and productivity applications. CPU-z confirms that PCIe is running at Gen4 speeds, and the memory is running at the correct profile/speed. In all, the motherboard is a good value for the performance and stability that it delivers.
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Reviewed in the United States on March 10, 2024 by Motocruzer
Style: MSI B550-A PRO ProSeries Motherboard
Buenas board
Reviewed in the United States on December 14, 2025 by Sebastian
Style: MSI B550-A PRO ProSeries Motherboard
Muy completa
Reviewed in the United States on December 4, 2025 by Ivan B.