ASUS Prime B450M-A II AMD AM4 (Ryzen 5000, 3rd/2nd/1st Gen Ryzen Micro ATX Motherboard (128GB DDR4, 4400 O.C.), NVMe, HDMI 2.0b/DVI/D-Sub, USB 3.2 Gen 2, BIOS Flashback, and Aura Sync)
Condition: Used - Good
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Availability:
In Stock.
Arrives
Saturday, Jun 20
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Style: Prime B450M-A II (Pack of 1)
Size: Micro ATX
Features
- 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.
Description
Powered by Ryzen 5000, 3rd Gen AMD® Ryzen™ processors, the ASUS Prime B450M-A II provides the solid foundation needed for your first build, plus flexibility to grow with your ambitions with a robust power design, automated system tuning, comprehensive cooling controls, and immersive onboard audio.
Brand: ASUS
CPU Socket: Socket AM4
Compatible Devices: Personal Computer
RAM Memory Technology: DDR4
Compatible Processors: AMD 1st Gerenration Ryzen
Chipset Type: AMD B450
Memory Clock Speed: 2400 MHz
Platform: Windows 10
Model Name: B450M-A II
CPU Model: Others
Processor Socket: Socket AM4
Compatible Devices: Personal Computer
RAM Memory Technology: DDR4
Compatible Processors: AMD 1st Gerenration Ryzen
Chipset Type: AMD B450
Memory Clock Speed: 2400 MHz
Platform: Windows 10
CPU Model: Others
Memory Storage Capacity: 128 GB
Ram Memory Maximum Size: 128 GB
Main Power Connector Type: 8 Pin
Graphics Card Interface: Integrated
Memory Slots Available: 4
Number of Ports: 6
S/PDIF Connector Type: Optical
System Bus Standard Supported: SATA 3
Total SATA Ports: 2
USB 2.0: 12
Total Usb Ports: 6
Number of Ethernet Ports: 1
Total Number of HDMI Ports: 1
Total PCIe Ports: 1
Brand: ASUS
Model Name: B450M-A II
Model Number: Prime B450M-A II
Manufacturer: ASUS
UPC: 192876924990
Mfr Part Number: Prime B450M-A II
Item Type Name: ASUS Prime B450M-A II AMD AM4 (Ryzen 5000, 3rd/2nd/1st Gen Ryzen Micro ATX Motherboard (128GB DDR4, 4400 O.C.), NVMe, HDMI 2.0b/DVI/D-Sub, USB 3.2 Gen 2, BIOS Flashback, and Aura Sync)
Item Weight: 2.1 Pounds
Warranty Description: 3 Years
Item Dimensions L x W x H: 9.5"L x 2"W x 9.6"H
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Jun 20
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: Prime B450M-A II (Pack of 1)
Size: Micro ATX
The ASUS Prime B450M-A II was an excellent choice for my PC. Installation was straightforward, and its compatibility with various generations of Ryzen processors gives me plenty of flexibility for future upgrades. It supports up to 128GB of DDR4 memory and allows for stable overclocking, which improves performance without any hassle. It also features modern ports like USB 3.2, NVMe, and HDMI 2.0b, making it very complete for its Micro ATX size. BIOS Flashback and Aura Sync are very useful extras that make setup and customization easier. All in all, a reliable and well-balanced motherboard.
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Reviewed in the United States on November 26, 2025 by Jonathan Céspedes
Style: Prime B450M-A II (Pack of 1)
Size: Micro ATX
The ASUS Prime B450M-A II Motherboard is like the MVP of budget builds – solid, reliable, and not here to break the bank. Compatible with Ryzen 5000, 3rd, 2nd, and 1st Gen, it’s basically like the party host that invites everyone. Setup is easy, and it’s got all the essentials, so you won’t be digging through your couch cushions for extra ports. Plus, the BIOS is user-friendly, so even if you’re not a tech wizard, you won’t feel like you’re disarming a bomb. It supports up to 128GB of RAM, which is way more than I’ll ever use (but nice to have in case I decide to run NASA simulations from my room). All in all, it’s a solid choice that gets the job done without a lot of drama – and leaves you with some cash left over for, you know, actual games
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Reviewed in the United States on November 2, 2024 by Sly
Style: Prime B450M-A II (Pack of 1)
Size: Micro ATX
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.
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Reviewed in the United States on February 3, 2025 by Buckerou
Style: Prime B450M-A II (Pack of 1)
Size: Micro ATX
Overall this motherboard works pretty well and I have no serious complaints. You do lose 2 of the SATA ports if you choose to use the M2 slot, which I don't like, but I've seen several other boards that have this limitation so I'm sure its some type of chipset limitation. It would have been nice if they could have shifted the x16 slot over one slot so that a 2 slot graphics card doesn't cover one of the PCI-E x1 slots, but I just used a PCI-E extender to move the card from that slot to elsewhere. Also: not sure if this is more an issue with the boardboard or the case I used, but I had to disconnect the USB 3.0 front panel header for cabling purposes, and the fit was so tight between the plastic guide and the cable plug that the whole guide came off with it when I pulled it off. I had to pry them back apart with a screwdriver and then carefully slip the guide back over the pins. No damager and everything works fine, but that was a bit scary.
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Reviewed in the United States on October 9, 2024 by GNINSC
Style: Prime B450M-A II (Pack of 1)
Size: Micro ATX
ASUS Prime B450M-A II – Great Budget-Friendly Motherboard I’ve been using the ASUS Prime B450M-A II in my Ryzen build, and it’s honestly been a really solid experience. I paired it with a Ryzen 5 5600 and 16GB of DDR4-3200 RAM, and everything worked smoothly after a quick BIOS update (which was easy thanks to the BIOS FlashBack feature). **What I like:** * It supports Ryzen 1000 to 5000 series CPUs, which gives you a lot of flexibility whether you're upgrading or building new. * BIOS FlashBack is super helpful — I was able to update the BIOS without even having a CPU installed. * RAM compatibility has been great, and the system feels very stable overall. * It’s a clean, straightforward layout that’s easy to work with, especially for first-time builders. **A few things to keep in mind:** * It only has one M.2 slot, so if you plan on using multiple NVMe drives, just be aware of that. * No PCIe 4.0 support — but for most builds, especially at this price, PCIe 3.0 is more than enough. * There are only a couple of case fan headers, so you might want to use a splitter if you’re running more fans. **Overall:** This board is a great pick for a budget or mid-range AMD build. It’s reliable, easy to set up, and works well with a wide range of Ryzen processors. If you don’t need a bunch of extra features and just want something solid that works, the B450M-A II is a great choice.
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Reviewed in the United States on July 27, 2025 Reviewed in the United States on July 27, 2025 by oscar buenrostro
Style: Prime B450M-A II (Pack of 1)
Size: Micro ATX
Esta motherboard todavía funciona a la perfección y es la que tengo instalada actualmente en mi PC principal. Es una opción muy estable y recomendada para configuraciones basadas en procesadores Ryzen.
Reviewed in the United States on May 28, 2026 by Elizabeth Gutierrez
Style: Prime B450M-A II (Pack of 1)
Size: Micro ATX
Found the ASUS Prime B450M-A II AMD AM4 motherboard on Amazon, purchased this for a good price, installed it and all computer components and...TURNED RIGHT ON!!! I also own 2 other ASUS motherboards and all have performed flawlessly! Will stick to the ASUS brand from now on as they have ALWAYS functioned as supposed to from right out of the box to years later! In addition, I love the ASUS Bios - just seems more user-friendly than the other brand. (*For the record, over the past month I have purchased TWO different MSI motherboards and BOTH have been defective!!! These will be a total of 3 MSI motherboards that I have purchased - the two recently and one a few years ago - and EVERY MSI I bought was defective right out of the box!) Very happy with ASUS and highly recommend!
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Reviewed in the United States on March 20, 2024 by Rychefan
Style: Prime B450M-A II (Pack of 1)
Size: Micro ATX
Nice mb for the money came on time
Reviewed in the United States on May 5, 2026 by Gary Campbell