ASUS Prime B450M-A II AMD AM4 (Ryzen 5000, 3rd/2nd/1st Gen Ryzen Micro ATX Motherboard (128GB DDR4, 4400 O.C.), NVMe, HDMI 2.

4.5 4.5 out of 5 stars | 6,308 ratings

Price: 79.31

Last update: 02-12-2025


About this item

AMD AM4 Socket : Compatible to Ryzen 5000, 3rd/2nd/1st Gen AMD Ryzen CPUs.Operating System : Windows 10 64-bit. Windows 7 64-bit
Designed for Productivity: USB 3.2 Gen 2 with 10Gbps ultra-fast transfer speed, onboard M.2 support, 4xDIMMs support up to 128GB DDR4 with 4400 (O.C.) performance, HDMI 2.0b/DVI/D-Sub
Optimized Cooling: VRM and PCH heatsink with extensive surface, thermal pads help transfer heat from the inductor and phase array to the heatsink. Flexible fan controls for ultimate cooling and quietness with ASUS exclusive Fan Xpert 2 plus
Built to Last: all-round protection with LANGuard, DRAM overcurrent protection, overvoltage protection, SafeSlot Core safeguards and stainless-steel back I/O, 1000 plus compatible devices, 8000 plus Validation Hours
PC DIY Friendly: With BIOS Flashback and ASUS exclusive UEFI BIOS
Outstanding Gaming Audio: Dedicated audio PCB layers, premium Japanese audio capacitors, and audio shielding ensures precision analog/digital separation and greatly reduced multi-lateral interference.
Aura Sync RGB and Armoury Crate Utility: with ASUS Armoury Crate synchronizing LED effects across a wide range of compatible PC gear, plus RGB LED and RGB header for greater customization
Please ensure your BIOS is up to date if installing a compatible Ryzen 5000 series CPU. Visit ASUS site search by motherboard model name, click on “Support” tab, Drivers and Tools, then BIOS and Firmware to download the latest BIOS.

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Top reviews from the United States

  • Raj
    5.0 out of 5 stars Great Replacement Motherboard – Worked Perfectly Out of the Box
    Reviewed in the United States on January 4, 2025
    I recently had to replace my old motherboard, and after some research, I decided on the ASUS Prime B550-PLUS as a solid mid-range option. I paired it with my Ryzen 7 3700x, and I’m happy to report that it worked flawlessly right out of the box.

    Easy Setup: The installation process was smooth, and the board had no compatibility issues with my existing components. It booted up without any problems with my Ryzen 7 3700x, which was a relief after dealing with the failure of my old motherboard.

    Great Features for the Price: The B550 chipset provides great value, offering support for PCIe 4.0. The board also has plenty of connectivity options, including USB 3.2 Gen 2 ports, which I find useful for my external devices.

    Solid Build Quality: ASUS has always been known for making durable motherboards, and the Prime B550-PLUS feels sturdy and reliable.

    BIOS Interface: The BIOS is user-friendly and easy to navigate. I didn’t have any issues tweaking settings or adjusting fan curves or enabling D.O.C.P, which is a plus for those who like to fine-tune their system.

    If you're looking to future-proof your build, I would recommend considering an AM5 motherboard for better long-term compatibility with upcoming Ryzen processors. The only reason I went with an AM4 motherboard is because I wanted to hand down my gaming rig to my little brother, and this was a cost-effective solution for my current needs.

    The ASUS Prime B550-PLUS is an excellent choice for anyone sticking with AM4, offering great value and features at a reasonable price. However, for those planning future upgrades, AM5 might be a better option to consider.
  • Bruh Moment
    5.0 out of 5 stars Great motherboard for a gaming build
    Reviewed in the United States on January 2, 2025
    Used this for a gaming PC build I put together for a friend, and it worked perfectly. No issues during setup, and it runs smoothly. Solid choice for a reliable and budget-friendly motherboard
  • Daniel
    5.0 out of 5 stars Arrived great, n nissues
    Reviewed in the United States on February 8, 2025
    Came in great condition with good packaging and no issues. Works flawlessly
  • Agosto
    4.0 out of 5 stars Good motherboard but it gave me drivers problems
    Reviewed in the United States on January 31, 2025
    This is a great motherboard for a budget but It gave me problems when installing the WiFi drivers, what I had to do is download an old version of the drivers and that fixed the problem. I recommend using headers splitter for the fan headers and the RGB header because they're limited, only 3 for fans and 2 for RGB 1 of 5 volts and 1 of 12 volts
  • Buckerou
    5.0 out of 5 stars A Great Replacement Board
    Reviewed in the United States on February 3, 2025
    I updated my son's Cyberpower PC to Windows 11. Everything installed successfully, including all the updates. Then after a restart the display wouldn't come on. That Mobo was an MSI B450 Tomahawk and the LED's said VGA problem. Given the circumstance I couldn't believe it suddenly died. I tried numerous times resetting the CMOS, reseating the graphics card, reseating memory, even checked the power supply, etc.
    I ordered this ASUS Prime B450M-A II as an economic replacement. It arrived in 2 days and was packaged well. The price dropped 2 days after I ordered. The box has labels Windows 11 ready and Ryzen 5000 Series ready. The board comes with backplate, 2 SATA cables, a M2 screw for mounting, a driver disc and the manual. This ASUS mobo is laid out differently than the MSI. I like it better. The graphics card slot is moved over one space with the M2 slot out in the open. With this Mobo you can use a M2 with a heatsink attached. The MSI M2 slot was directly under a dual-slot graphics card. I like the BIOS flashback feature (located on the back) with this board. The BIOS is laid out well, very intuitive and easy to use.
    I have built several computers over the years with ASUS my go-to brand. This Mobo is a great full featured B450 motherboard for AM4 series CPU's. The BIOS is upgraded to accept Ryzen 5000 series CPU's. Simply put you're getting a great AM4 motherboard for a great price.
  • Bobby B
    5.0 out of 5 stars Great value for a Ryzem MB
    Reviewed in the United States on January 8, 2025
    Great for a budget build, paired it with a Ryzen 5 5600GT, 16 GB Corsair Vengence DDR 4 3200, Crucial P3 Plus 1TB PCIe 4.0 3D NAND NVMe M.2 SSD, Corsair 650 W power supply, and an old case I had sitting around that had a DVD burner in it, total cost under very low. Not as fast as my Ryzen 7 7700X machine but plenty fast for everyone except an avid gamer.

    First thing I ran into was the back plate that covers the USB and other ports was wrong, so couldn't use the USB flash port (already had the board installed when I noticed this, didn't feel like taking it out again so had to update the bios using Windows 10, Windows 11 didn't recognize the CPU, their flash utility didn't work so loaded Windows 10 first, used it to update the BIOS in Windows, then upgraded to Windows 11. Maybe not the best way to do it but it worked for me (having a Microsoft account was able to install Windows 10 then upgrading to Windows 11 with no problem.)

    With the stock wraith cooler temp sits at 40 degrees Celsius, well within specs.

    I've built several computers using AMD processors and Asus motherboards, never had a problem with either one. After you update the BIOS use the Armoury Crate software from AMD to update all the drivers including the wireless drivers and all will go smooth.

    Really the only con is needing to update the BIOS but don't really consider it a con.
    Customer image
    Bobby B
    5.0 out of 5 stars
    Great value for a Ryzem MB

    Reviewed in the United States on January 8, 2025
    Great for a budget build, paired it with a Ryzen 5 5600GT, 16 GB Corsair Vengence DDR 4 3200, Crucial P3 Plus 1TB PCIe 4.0 3D NAND NVMe M.2 SSD, Corsair 650 W power supply, and an old case I had sitting around that had a DVD burner in it, total cost under very low. Not as fast as my Ryzen 7 7700X machine but plenty fast for everyone except an avid gamer.

    First thing I ran into was the back plate that covers the USB and other ports was wrong, so couldn't use the USB flash port (already had the board installed when I noticed this, didn't feel like taking it out again so had to update the bios using Windows 10, Windows 11 didn't recognize the CPU, their flash utility didn't work so loaded Windows 10 first, used it to update the BIOS in Windows, then upgraded to Windows 11. Maybe not the best way to do it but it worked for me (having a Microsoft account was able to install Windows 10 then upgrading to Windows 11 with no problem.)

    With the stock wraith cooler temp sits at 40 degrees Celsius, well within specs.

    I've built several computers using AMD processors and Asus motherboards, never had a problem with either one. After you update the BIOS use the Armoury Crate software from AMD to update all the drivers including the wireless drivers and all will go smooth.

    Really the only con is needing to update the BIOS but don't really consider it a con.
    Images in this review

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