ASUS Prime B550M-A WiFi II AMD Micro ATX Motherboard with PCIe 4.0, WiFi 6, ECC Memory, HDMI 2.1, RGB Header
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Availability:
Only 5 left in stock, order soon!
Arrives
Thursday, Aug 13
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Style: mATX
Size: B550M-A|M.2x2|D4|WiFi6
Features
- AMD AM4 Socket and PCIe 4.0: The perfect pairing for 3rd Gen AMD Ryzen CPUs
- Ultrafast Connectivity: 1x PCIe 4.0 x16 SafeSlot, WiFi 6 (802.11ax), 1Gb LAN, dual M.2 slots (NVMe SSD)one with PCIe 4.0 x4 connectivity, USB 3.2 Gen 2 Type-A , HDMI 2.1 (4K at 60HZ), D-Sub & DVI
- Comprehensive Cooling: VRM heatsink, PCH heatsink, hybrid fan headers and Fan Xpert 2 utility
- 5X Protection III: all-round protection with LANGuard, DRAM overcurrent protection, overvoltage protection, SafeSlot Core safeguards and stainless-steel back I/O
- Boosted Memory Performance: ASUS OptiMem proprietary trace layout allows memory kits to operate at higher frequencies with lower voltages to maximize system performance.
Description
Powered by 3rd Gen AMD® Ryzen™ processors, the ASUS Prime B550M-A WiFi II delivers next-generation speeds with PCIe 4.0, WiFi 6 and 1Gb LAN. Boasting a robust power design, comprehensive cooling solutions and intelligent tuning options, the ASUS Prime B550M-A WiFi 6 provides mainstream PC users and DIY PC builders with a perfect all-around foundation via intuitive software and firmware features.
Brand: ASUS
CPU Socket: Socket AM4
Compatible Devices: Personal Computer
RAM Memory Technology: DDR4
Compatible Processors: AMD 3rd Generation Ryzen
Chipset Type: AMD B550
Memory Clock Speed: 2133 MHz
Platform: Windows 10
Model Name: PRIME B550M-A WIFI II
CPU Model: Others
Processor Socket: Socket AM4
Compatible Devices: Personal Computer
RAM Memory Technology: DDR4
Compatible Processors: AMD 3rd Generation Ryzen
Chipset Type: AMD B550
Memory Clock Speed: 2133 MHz
Platform: Windows 10
CPU Model: Others
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: 13
S/PDIF Connector Type: Optical
System Bus Standard Supported: SATA 3
Total SATA Ports: 4
USB 2.0: 11
Total Usb Ports: 6
Number of Ethernet Ports: 1
Total Number of HDMI Ports: 1
Total PCIe Ports: 3
Brand: ASUS
Model Name: PRIME B550M-A WIFI II
Model Number: PRIME B550M-A WIFI II
Manufacturer: ASUS
UPC: 195553309752
Mfr Part Number: PRIME B550M-A WIFI II
Item Type Name: Computer motherbaord
Item Weight: 2.55 Pounds
Warranty Description: 3 Years
Item Dimensions L x W x H: 10.5"L x 2.8"W x 10.8"H
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Aug 13
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: mATX
Size: B550M-A|M.2x2|D4|WiFi6
TBH, I picked this board mainly to pair with my Ryzen 5, and the build experience was better than expected. The biggest highlight has to be the integrated Wi-Fi and Bluetooth. It saved me from the hassle of running cables at home; the signal is rock solid, and it saved me the cost of an extra network card—10/10, worth it! The BIOS is super user-friendly, allowing even a beginner builder to easily set up XMP. No cap. Tbh, the port selection is kinda basic, but it’s def sufficient for daily use. The PCIe 4.0 support gives me peace of mind for future SSD upgrades. If your priority is stability, ease of use, and a no-fuss setup, this M-ATX board is a top-tier value pick among B550s. Highly recommended for stable performance-seekers like me! Goated board.
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Reviewed in the United States on November 13, 2025 Reviewed in the United States on November 13, 2025 by Jo
Style: mATX
Size: B550M-A|M.2x2|D4|WiFi6
I am in love with ASUS products, and this one doesnt disappoint. Love this mother board. I cant wait to try newer versions of mother boards.
Reviewed in the United States on May 21, 2026 by Murphy
Style: mATX
Size: B550M-A|M.2x2|D4|WiFi6
Solid board, everything worked out of the box. Driver update tool that tries to install also tries to launch automatically run under every profile but requires admin credentials to do so, so I uninstalled that.
Reviewed in the United States on May 3, 2026 by N. Claypool
Style: mATX
Size: B550M-A|M.2x2|D4|WiFi6
I wanted to test this for a while before reviewing to make sure I didn't have any unexpected surprises. It has amazing features, GREAT capacity, both with storage and memory, especially from a Micro ATX board. The wifi seems pretty solid giving a consistant 500-800Mbps download speed on a shared gigabit connection, while the ethernet connection seems to pull a solid 900+Mbps speed. I am running on 2x8 3200 MHz speed CL16 memory but according to the official specs, it supports up to 128gigs (4x32 gig) and overclock speeds of up to 4866 MHz For storage, you have the options of 1 NVMe and 4 sata drives, or you can run two NVME and 2 Sata drives (installing a second NVMe drive typically disables two sata ports. The only real problem I have is mine came with a USB port with a short in it causing my power to instantly power off any time anything is plugged into the port. (I know this is a defect instead of design flaw because mine seems to be the only one with this problem and it did this from day one) Over all, very happy though and SUCH an upgrade from my last motherboard!
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Reviewed in the United States on October 28, 2025 by Kole
Style: mATX
Size: B550M-A|M.2x2|D4|WiFi6
Be careful to make sure your graphics port doesn't cover one of the pcie slots, it's a little close. Also mobo only has 1 usb 3.0 bus and no usb c e connector so will need an additional pcie card if the front of the case has usb 3.0 and usb c connections. Install and setup was a breeze, asus software is top notch. Make sure to have the wifi or nic driver on removeable storage. Hardwired my nic kept going on and off without drivers installed. Wouldn't stay connected long enough to download. Once a driver was installed for one of the nic ports everything was flawless
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Reviewed in the United States on July 19, 2024 by John
Style: mATX
Size: B550M-A|M.2x2|D4|WiFi6
Can't say enough about this product. I was very specific on my needs like bluetooth and WiFi and this had it all. Yes, it's not the latest tech as it is still PCIe 4.0 vs 5.0 that's all I needed: light gaming and a very strong workstation. Tried and true no crashing or hiccups. The Bios was the latest update so when I installed the CPU, Ryzen 7 5700g, it booted right up no updates needed. This fit the bill. The only catch is that once installed some drivers need updating like Bluetooth. I thought windows was strong enough to update but it wasn't however Ausu provided a cd that corrected the proper drivers and once done everything worked perfectly (luckily, I has an external cd player to use). Definitely recommended.
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Reviewed in the United States on December 3, 2025 by mbPA
Style: mATX
Size: B550M-A|M.2x2|D4|WiFi6
//Apr 2026 Update// Since posting the original review, I upgraded to a Ryzen 9 5950X and an RTX 5060 Ti 16GB, paired with a Corsair CX650M 650W PSU to really push this board. The previous setup was much lighter. Power delivery has been excellent, the VRMs are still stellar, and the system has remained completely stable under the heavier load. I even added a second Samsung M.2. Zero regrets here. This thing flat-out delivers. //original post// Solid board with clean layout, reliable power delivery, and no nonsense in BIOS navigation. BIOS 3621 includes AGESA 1.2.0.E, but heads-up: - System Info shows a build date of Jan 13, 2025 - ASUS site lists release date as April 7, 2025 This isn’t a bug—it’s standard firmware practice. The BIOS was compiled in January, validated internally, and released publicly in April. If you're checking microcode or AGESA lineage, this timestamp mismatch might trip you up. Just know: - Microcode 0x10800014 = AGESA 1.2.0.E - No update needed unless ASUS drops a newer AGESA Powers a Ryzen 7 5700G, ASRock RX 6600XT, 64GB Crucial Pro CL22 RAM, and a Samsung M.2. I used an adapter for the 19-pin-to-E_USBC, but ended up going back to the 19-pin for the USB-A ports since I use those more in the front. My M4 Pro MacBook Pro powers the USB-C stuff now, so it's all good. The heatsink on the chipset is a nice touch, just wish a Frozr or something would have been on the M.2. But, in an NZXT H9 Flow non-RGB with a Thermaltake Peerless Assassin 120 SE v3 CPU cooler, this thing is definitely cooled. The motherboard sensor is a constant 22C until I start pushing some heavy Docker stuff, and even when I ran a few benchmarks, it barely went above 27, and this was a constant benchmark run, I expected it to hit 30 easy. It did not. That speaks to its VRMs and for that it gets 5-stars. I am incredibly pleased with the VRM performance and holding its own on heavy loads and benchmarking. I pushed it hard, it said, Nah, I'm cool. Ridiculous value. No Gen2 header, no Frozr or equivalent for the M.2, but those VRMs are legit. No regrets on this, it delivers in spades. This will last me to a Zen 7 upgrade without question.
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Reviewed in the United States on August 8, 2025 by CajunDragon
Style: mATX
Size: B550M-A|M.2x2|D4|WiFi6
I purchased this motherboard and an extended warranty. I installed it myself as a part of my PC upgrade for Windows 11. The video output failed after about two months. That's when the fun started. I contacted ASUS and explained the problem with a support person. After several hours of trying this and that, the support person agreed with me that the motherboard had failed. I requested a replacement. They requested a deposit which was more than I actually paid for the motherboard. I agreed and sent the deposit. They sent me a replacement motherboard, and I returned the failed component per their instructions. That was three months ago. I've contacted ASUS multiple times trying to get my deposit back. I have yet to get the deposit back. Every time I contact them, they tell me that they are going to elevate my case. I've tired of contacting them and getting the same old run around. I won't be buying anything else from ASUS!
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Reviewed in the United States on March 18, 2026 by William R. Stewart