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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Availability:
Only 5 left in stock, order soon!
Arrives
Friday, May 8
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
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
Memory Clock Speed: 6.0
Platform: Windows 10
Model Name: B550APRO
CPU Model: AMD Ryzen 7
Processor Socket: Socket AM4
Compatible Devices: Personal Computer
RAM Memory Technology: DDR4
Compatible Processors: RYZEN 9
Chipset Type: AMD B550
Memory Clock Speed: 6.0
Platform: Windows 10
CPU Model: AMD Ryzen 7
Memory Storage Capacity: 128 GB
Ram Memory Maximum Size: 128 GB
Main Power Connector Type: 24-Pin
Graphics Card Interface: PCI Express
Memory Slots Available: 4
Number of Ports: 23
S/PDIF Connector Type: Optical
System Bus Standard Supported: SATA 3
Total SATA Ports: 6
USB 2.0: 2
Total Usb Ports: 15
Number of Ethernet Ports: 1
Total Number of HDMI Ports: 1
Total PCIe Ports: 4
Brand: msi
Model Name: B550APRO
Model Number: B550-A PRO
Manufacturer: MSI
UPC: 824142219362
Mfr Part Number: B550-A PRO
Item Weight: 1500 Grams
Warranty Description: 3 Years
Item Dimensions L x W x H: 14"L x 11"W x 3"H
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, May 8
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
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
I choose this motherboard after reading countless reviews because of sobriety, very good VRM and nice features, including USB-C for the price. What I want is a good, fast, stable and long lasting PC for the next 10+ years or so. I won't be doing any overclock, just regular stuff and gaming. Can't say about the RGB lights because I turned them off right away before assembly with the handy switch at the lower end. My build: * MSI B550-A PRO. This beauty. Again, the VRM is very important for durability. * Corsair Vengeance LPX 32GB (2 X 16GB) DDR4 3600. Plenty for the time being and detected automatically in the BIOS. * AMD Ryzen 7 5700G. If you intend to use the integrated graphic card in this processor, buy DDR4 3600 RAM because it is faster for shared memory. * Samsung 980 SSD 1TB. Great quality, durable and very fast. The main NVMe slot, don't forget, has better I/O speed vs the second one at the bottom. * A nice, generic case with frontal USB-C. Works fine with Windows 10 Pro but It's also compatible with Linux out of the box. Tested distros: MX Linux 21 (AHS), Manjaro and Mabox Linux. I don't like Win11 but the BIOS has fTPM and a TPM connector if you want to buy your own.
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Reviewed in the United States on December 17, 2022 by AmazonBuyer
Style: MSI B550-A PRO ProSeries Motherboard
B550 mobos are made by many manufacturers. MSI usually makes good quality, high performance components. This is no excretion. B550 is a chipset. The boards built around it vary widely in quality and ports. I did a lot of research before selling on this one. The connections exist on this board are overkill, which is a great thing! I have over 23TB of storage across 6 drives (2 nVME, 2 SATA3 internal SSDs, 2 SATA3 HDDs for backups), an AIO CPU water cooler, a beefy vid card with high bus demands, etc. The only thing I had to install as a supplement is a 4x PCIe board with 2 more SATA3 plugs. The board has 6 on it, already. I needed 8. 6 is more then some other manufacturers put on their B550's. Very happy with this purchase. Getting very good performance in diagnostic testing. It runs cool. The chipset temp rarely goes above 32c even under heavy load, and this board is not water cooled. Pretty impressive.
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Reviewed in the United States on December 23, 2024 by Joe
Style: MSI B550-A PRO ProSeries Motherboard
It’s a pretty decent AM4 board but no WiFi and nothing spectacular about the specks other then it’s cheaper to build then a AM5 right now.
Reviewed in the United States on February 13, 2026 by Eric S
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