Asus Prime B450M-A II AMD Micro ATX Motherboard
ASUS Prime B450M II Series motherboards provide the solid foundation needed for your first build, plus flexibility to grow with your ambitions. When you build with an ASUS Prime B450M II Series motherboard, you build smart, easy and affordably PCIe 3.0 M.2 (up to 32 Gbps) Achieve speed with onboard M.2 M.2 Slot supports up to 22110 and data-transfer speed up to 32Gbps via x4 PCI Express 3.0 bandwidth. It's the perfect choice for an operating system or application drive, providing fast access to data. USB 3.2 Gen 2 Type-A Numerous USB ports support high-end rigs loaded with peripherals, including two rear-panel USB Type-A connectors with fast USB 3.2 Gen 2 connectivity for compatible cases Quick and Simple Setup EZ mode displays vital settings and stats and also offers guided wizards, drag-and-drop functionality, and one-click application of important settings -- all to help you get your rig up and running in no time. Advanced Tuning for Serious Tweakers An intuitive Advanced mode offered via the UEFI lets you take complete control. A built-in search feature makes it easy to find options, and various Advanced functions let you intelligently make nuanced adjustments so you can dial in performance just the way you want.
ASUS Prime B450M II Series motherboards provide the solid foundation needed for your first build, plus flexibility to grow with your ambitions. When you build with an ASUS Prime B450M II Series motherboard, you build smart, easy and affordably PCIe 3.0 M.2 (up to 32 Gbps) Achieve speed with onboard M.2 M.2 Slot supports up to 22110 and data-transfer speed up to 32Gbps via x4 PCI Express 3.0 bandwidth. It's the perfect choice for an operating system or application drive, providing fast access to data. USB 3.2 Gen 2 Type-A Numerous USB ports support high-end rigs loaded with peripherals, including two rear-panel USB Type-A connectors with fast USB 3.2 Gen 2 connectivity for compatible cases Quick and Simple Setup EZ mode displays vital settings and stats and also offers guided wizards, drag-and-drop functionality, and one-click application of important settings -- all to help you get your rig up and running in no time. Advanced Tuning for Serious Tweakers An intuitive Advanced mode offered via the UEFI lets you take complete control. A built-in search feature makes it easy to find options, and various Advanced functions let you intelligently make nuanced adjustments so you can dial in performance just the way you want.
ASUS Prime B450M II Series motherboards provide the solid foundation needed for your first build, plus flexibility to grow with your ambitions. When you build with an ASUS Prime B450M II Series motherboard, you build smart, easy and affordably PCIe 3.0 M.2 (up to 32 Gbps) Achieve speed with onboard M.2 M.2 Slot supports up to 22110 and data-transfer speed up to 32Gbps via x4 PCI Express 3.0 bandwidth. It's the perfect choice for an operating system or application drive, providing fast access to data. USB 3.2 Gen 2 Type-A Numerous USB ports support high-end rigs loaded with peripherals, including two rear-panel USB Type-A connectors with fast USB 3.2 Gen 2 connectivity for compatible cases Quick and Simple Setup EZ mode displays vital settings and stats and also offers guided wizards, drag-and-drop functionality, and one-click application of important settings -- all to help you get your rig up and running in no time. Advanced Tuning for Serious Tweakers An intuitive Advanced mode offered via the UEFI lets you take complete control. A built-in search feature makes it easy to find options, and various Advanced functions let you intelligently make nuanced adjustments so you can dial in performance just the way you want.
ASUS Prime B450M II Series motherboards provide the solid foundation needed for your first build, plus flexibility to grow with your ambitions. When you build with an ASUS Prime B450M II Series motherboard, you build smart, easy and affordably PCIe 3.0 M.2 (up to 32 Gbps) Achieve speed with onboard M.2 M.2 Slot supports up to 22110 and data-transfer speed up to 32Gbps via x4 PCI Express 3.0 bandwidth. It's the perfect choice for an operating system or application drive, providing fast access to data. USB 3.2 Gen 2 Type-A Numerous USB ports support high-end rigs loaded with peripherals, including two rear-panel USB Type-A connectors with fast USB 3.2 Gen 2 connectivity for compatible cases Quick and Simple Setup EZ mode displays vital settings and stats and also offers guided wizards, drag-and-drop functionality, and one-click application of important settings -- all to help you get your rig up and running in no time. Advanced Tuning for Serious Tweakers An intuitive Advanced mode offered via the UEFI lets you take complete control. A built-in search feature makes it easy to find options, and various Advanced functions let you intelligently make nuanced adjustments so you can dial in performance just the way you want.
in 10 offers
The lowest price for Asus Prime B450M-A II AMD Micro ATX Motherboard right now is $129.00 at PCByte AU, compared across 9 retailers.
The all-time low was $79.00 on 6 Mar 2026 — today's price is 63% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 4 Oct 2026.
Last updated at 04/10/2026 16:03:37
Asus Prime B450M-A II AM4 mATX Motherboard (PRIME B450M-A II)
ASUS PRIME B450M-A II AMD Micro ATX motherboard with M.2 support, HDMI/DVI-D/D-Sub, SATA 6 Gbps, 1 Gb Ethernet USB 3.2 Gen 2 Type-A BIOS FlashBack RGB
ASUS PRIME B450M-A II micro ATX motherboard - AMD B450 Socket AM4
ASUS Prime B450M-a Ii AM4 Matx
Free delivery
Asus Prime B450M-A II AMD/Ryzen AM4 Micro ATX Motherboard w/ Aura Sync RGB Light
Free delivery between 8–12 Oct
For Asus Prime B450m-a Ii Motherboard Am4 Ddr4 128g Hdmi+vga+dvi M-atx
Free delivery
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ASUS PRIME B450M-A II AMD Micro ATX motherboard with M.2 support, HDMI/DVI-D/D-Sub, SATA 6 Gbps, 1 Gb Ethernet USB 3.2 Gen 2 Type-A BIOS FlashBack RGB
Free delivery
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 2,
Delivery between 11–14 Oct $29
ASUS PRIME B450M-A II AMD B450 Ryzen AM4 Micro ATX Motherboard M.2 Support HDMI/DVI-D/D-Sub Support SATA 6Gbps 1GB Ethernet USB 3.2 Gen 2 Type-A BIOS
Delivery between 9–13 Oct $41
originally posted on microcenter.com
This motherboard has all the basic features you need and is compatible with my Ryzen CPU. I tried adding 2 RAM sticks in the recommended configuration (A2 and B2) but my computer would not POST. My sticks of RAM were fine because I tested them individually in B2. It turns out that the A1 and A2 slots were not functioning. I had to loosen my CPU cooler mounting bracket significantly to get it to run, but it wasn’t stable at the 3200 mHz the sticks were rated for. They run, just slower. So the board may not be as robustly built as it should be, but it was cheap and it functions with some extra effort on my end
originally posted on newegg.com
This motherboard is AWESOME! It has exceeded my expectations for a project build. I had to rearrange a bunch of components to fit it in, as the micro ATX case I chose is quite cramped, and the motherboard is wider than the older ASUS that was in there, but once installed, I was able to plug everything in quite easily without much help from the included manual. One thing that I was confused about: the system beeped at me, and upon research I found out it was a memory problem. Basically, I had installed it wrong - I put both modules in the first and second slots, when it should have been the second and fourth. Just a heads up for other noobs; double-check how to install memory before finishing your PC build or upgrade. According to some reviewer on here, this board is ... MoreThis motherboard is AWESOME! It has exceeded my expectations for a project build. I had to rearrange a bunch of components to fit it in, as the micro ATX case I chose is quite cramped, and the motherboard is wider than the older ASUS that was in there, but once installed, I was able to plug everything in quite easily without much help from the included manual. One thing that I was confused about: the system beeped at me, and upon research I found out it was a memory problem. Basically, I had installed it wrong - I put both modules in the first and second slots, when it should have been the second and fourth. Just a heads up for other noobs; double-check how to install memory before finishing your PC build or upgrade. According to some reviewer on here, this board is not Windows 11 ready. That is not true; some setup in the BIOS is required before Windows 11 can install. TL;DR, check that Windows UEFI mode and TPM security are both enabled. I've set it up with 8GB memory, an AMD Ryzen 5600G processor, and a 256GB M.2 solid-state drive. So far, it works great! I'm very happy with my purchase.
originally posted on microcenter.com
Needed to update my mancave PC. Had a graphics card and Ryzen 5 2400G CPU laying around, decided to get a Ryzen motherboard to rig up a "new" system. Love that this MB can accept my older Ryzen CPU all the way up to 5th gen Ryzen CPUs, at much higher memory speeds, and supports USB 3.2.. The BIOS looks to be set up to easily overclock things if you choose to. The board installed easily and worked as expected. Has support for RGB LED light strips, but I didn't fiddle with any of that. The price was about as cheap as it gets, and gets the job done. Recommended.
| Memory | |
| Unbuffered memory | Y |
| Maximum internal memory | 128 GB |
| Supported memory clock speeds | 2133,2400,2666,2800,3000,3200,3300,3400,3466,3600,3733,3866,4000,4400 MHz |
| ECC | Y |
Asus Prime B450M-A II AM4 mATX Motherboard (PRIME B450M-A II)
ASUS PRIME B450M-A II AMD Micro ATX motherboard with M.2 support, HDMI/DVI-D/D-Sub, SATA 6 Gbps, 1 Gb Ethernet USB 3.2 Gen 2 Type-A BIOS FlashBack RGB
ASUS PRIME B450M-A II micro ATX motherboard - AMD B450 Socket AM4
ASUS Prime B450M-a Ii AM4 Matx
Free delivery
Asus Prime B450M-A II AMD/Ryzen AM4 Micro ATX Motherboard w/ Aura Sync RGB Light
Free delivery between 8–12 Oct
This motherboard has all the basic features you need and is compatible with my Ryzen CPU. I tried adding 2 RAM sticks in the recommended configuration (A2 and B2) but my computer would not POST. My sticks of RAM were fine because I tested them individually in B2. It turns out that the A1 and A2 slots were not functioning. I had to loosen my CPU cooler mounting bracket significantly to get it to run, but it wasn’t stable at the 3200 mHz the sticks were rated for. They run, just slower. So the board may not be as robustly built as it should be, but it was cheap and it functions with some extra effort on my end
This motherboard is AWESOME! It has exceeded my expectations for a project build. I had to rearrange a bunch of components to fit it in, as the micro ATX case I chose is quite cramped, and the motherboard is wider than the older ASUS that was in there, but once installed, I was able to plug everything in quite easily without much help from the included manual. One thing that I was confused about: the system beeped at me, and upon research I found out it was a memory problem. Basically, I had installed it wrong - I put both modules in the first and second slots, when it should have been the second and fourth. Just a heads up for other noobs; double-check how to install memory before finishing your PC build or upgrade. According to some reviewer on here, this board is ... MoreThis motherboard is AWESOME! It has exceeded my expectations for a project build. I had to rearrange a bunch of components to fit it in, as the micro ATX case I chose is quite cramped, and the motherboard is wider than the older ASUS that was in there, but once installed, I was able to plug everything in quite easily without much help from the included manual. One thing that I was confused about: the system beeped at me, and upon research I found out it was a memory problem. Basically, I had installed it wrong - I put both modules in the first and second slots, when it should have been the second and fourth. Just a heads up for other noobs; double-check how to install memory before finishing your PC build or upgrade. According to some reviewer on here, this board is not Windows 11 ready. That is not true; some setup in the BIOS is required before Windows 11 can install. TL;DR, check that Windows UEFI mode and TPM security are both enabled. I've set it up with 8GB memory, an AMD Ryzen 5600G processor, and a 256GB M.2 solid-state drive. So far, it works great! I'm very happy with my purchase.
Needed to update my mancave PC. Had a graphics card and Ryzen 5 2400G CPU laying around, decided to get a Ryzen motherboard to rig up a "new" system. Love that this MB can accept my older Ryzen CPU all the way up to 5th gen Ryzen CPUs, at much higher memory speeds, and supports USB 3.2.. The BIOS looks to be set up to easily overclock things if you choose to. The board installed easily and worked as expected. Has support for RGB LED light strips, but I didn't fiddle with any of that. The price was about as cheap as it gets, and gets the job done. Recommended.
I’ve now been using this for several weeks on a dual-boot system. I installed it with Ryzen 5600G + 32GM RAM, 2 HD’s from previous system, 1 SSD from another previous system and a DVD Writer. It’s used in an office setting wherein the Linux Mint 20.3 part takes care of orders from an online shopping cart and edits our website. The Windows 11 Pro part works with our QuickBooks desktop software, handles correspondence with LibreOffice and light image editing using Affinity Photo, Design & Publisher. It is handling all tasks quickly and efficiently and staying cool and quiet. We hope for many years of service. Given our past experience with Asus motherboards we expect all good things.
First ever review for me, but felt others (Linux users) might want to know. This board provides good value and it does come (as another reviewer noted) with BIOS 1201. 1201 will let you boot up a Ryzen 3 or 5 3200G/3400G (know that these chips are actually based on last year's 11nm & thus not true 3000 cpu releases). But what non-users of ASUS motherboards might not be aware of or not know is that the BIOS EZ Flash 3 Utility provided by ASUS (inside the BIOS0 does not require an OS to update the BIOS. You ca actually update the motherboard without any hard drive/SSD/etc installed). Upon receiving this Prime B450M-A I immediately put it into a spare case I had lying around, put in a Ryzen 3 3400G I had picked up on Home Essentials Direct sold for $88, used the ... MoreFirst ever review for me, but felt others (Linux users) might want to know. This board provides good value and it does come (as another reviewer noted) with BIOS 1201. 1201 will let you boot up a Ryzen 3 or 5 3200G/3400G (know that these chips are actually based on last year's 11nm & thus not true 3000 cpu releases). But what non-users of ASUS motherboards might not be aware of or not know is that the BIOS EZ Flash 3 Utility provided by ASUS (inside the BIOS0 does not require an OS to update the BIOS. You ca actually update the motherboard without any hard drive/SSD/etc installed). Upon receiving this Prime B450M-A I immediately put it into a spare case I had lying around, put in a Ryzen 3 3400G I had picked up on Home Essentials Direct sold for $88, used the provided AMD cooler it came with and it's pre-applied paste (unless you game 24-7, don't listen to the Net chatter about needing brand name, expensive thermal paste), then installed this ram - Crucial Ballistix Sport LT 3000 MHz DDR4 DRAM Desktop Gaming Memory Kit 16GB (8GBx2) CL15 BLS2K8G4D30AESCK (White) along with an totally empty non-formatted new Crucial120GB SSD I had lying around. This was all powered by a Corsair 400W PSU. Before doing anything OS-wise, I started the system up and hit "delete" to get into the BIOS. Using the ASUS EZ Flash Utility in the BIOS, which gives you the option of either using your own fat16/32 thumb drive (don't use any other format) or you can use the ethernet Internet connection the board already detects, I immediately updated the BIOS to ASUS' latest BIOS, 1820 (just yesterday I did it again & updated 1823). I then waited as the BIOS restarted itself, then stuck in an Ubuntu 18.04.3 ISO on a DVD (just choose your CD/DVD burner in the BIOS front page as your first boot choice) and hit delete again to get back into the BIOS. I chose my CD/DVD drive as my first boot choice on the first page of ASUS' excellent BIOS, and then it started up. Within several minutes, Ubuntu was completely installed on the SSD (this chip/memory/board is fast), the system rebooted, and I was staring at Ubuntu 18.04.3 where it made my 20" PC screen the "primary" while my 42" plasma TV was also picked up as the "secondary" screen. This is/was great, no messing with that, correct 1920x1080 resolutions too. Since the above (about 9-10 days), I have not had one crash or problem with the board running any version of Ubuntu from 18.04.3 & above. This computer system is in the living room where it gets heavy use by the family and kids for everything, from Netflix streaming, to multi-purpose PC uses, etc (I won't talk of this Ryzen 3 3200G's gaming performance, as it is already well-covered on the Net--at this price, for gaming, it simply rocks and, unbelievably to me, the included cooler handles things quite well--again, as long as the kids don't game 24-7, if that stats happening, which might as they see how fast this system is and what it can handle, I will get a bigger and better cooler to be safe). Also, here's what I found (over the past few days of testing) in terms of what will successfully boot Linux-wise on this Prime B450M-A motherboard using the latest AMD Ryzen 3 3200G chip mentioned above: (you'll notice as I list the successes and failures, the Linux OSes that come with Kernel 5 or above, they all boot up great; the others do not and you will have to perform some tricks and kernel installs to get things going if you use a Linux OS that doesn't come with kernel 5 or above): Successes: Ubuntu 18.04.3 LTS and all 19s 9I tried 19.10 too, worked great) Fedora 31 (Fedora actually seemed to be the fastest out of these 2 successes, but I stuck to Ubuntu for gaming reasons) Failed to boots: Debian 10.1 Linux Mint 19 (and version) MX-Linux 19 Opensuse LEAP & Tumbleweed etc, etc...(tried about 6 others, all failed because they don't have come with kernel 5 or above). Last thing I want to note is the latest BIOS updates come where ASUS (upon instructions) have disabled PCIe4. This "disabling of PCIe4" not ASUS's fault, this is AMD's. AMD is still not enabling PCIe4 on 300/400 series motherboards, and are instructing motherboard manufactuers (if they had enabled PCIe4) to disable PCIe4. AMD, if you know about the Pinnacle Ridge cpu clusterf#ck last year that they are still trying to be clear up completely, this board with the recently released Ryzen 3/5 3000 cpu(s) is a welcome change. ASUS did nothing wrong here. AMD is still saying they are not going to be releasing Linux-specific Ryzen drivers, which is kind of interesting since it was us Linux people who kept AMD afloat back in the dark days when it was thought Intel would crush them & drive them into insolvency. Sure hopes AMD rethinks things, and gets their act together over these next 4-9 months Linux-wise as the truly new 3000 cpus come out next summer. In sum, the ASUS Prime B450M-A board I tested here with a Ryzen 3 3200G cpu and 3000 MHZ DDR4 was a fun, hassle-free build. I also know t...
This is a great little mother board! Even though this is a mATX motherboard, everything is really accessible. This is my first PC build, and I was able to through everything together in one afternoon with the included instructions. I paired this mobo with a ryzen 5 chip, 32gb of DDR4 ram, 1tb nvme SSD for the C drive, a 2tb 2.5" ssd for storage, and a geforce rtx 2080 super gpu. This is all running off a evga 500w PSU. Everything runs perfectly, and fits nicely with plenty of room for cable management.
Contrary to what Asus says, this motherboard is NOT Win11 compatible.There are dozens maybe hundreds of articles about enabling Secure Boot in the BIOS. It does not work, even when you follow the instructions to the T, it will not install or upgrade to Win11, as it says Must have Secure Boot EnabledI have upgraded, downgraded and reloaded the BIOS 6-7 times, it does not matter. Changing Secure Boot to UEFI does nothing to satisfy the requirement for Secure Boot.Other that that, this is a great motherboard, I have used it in at least 12 builds over the last few years.Again, if you think you can get Win11 running on this board, good luck to you.
I've built probably 50-60 pc's from scratch over the years. Almost always ASUS..Early days... Motherboads required a dedicated graphics card. (AGP)Then many systems I built for basic use had on-board chipsets and did VGA (no dedicated graphics card needed but could expand if you wanted)Last system I built 6-7 yrs ago, I think (don't quote me) had GPU integrated in the CPU. no dedicate graphics needed..I bought this board on a combo email offer.. Seen the VGA on the Motherboard and assumed with a new Ryzen 5x Chip I'm good to go.. NOT SO ! I got no video and 3 beeps. Google search and calling tech support says 3 beeps is a memory issue. Read on MC forum new AMD chips too new.. Need to upgrade BIOS.. Upgrade BIOS.. Same thing. Called Microcenter support and ... MoreI've built probably 50-60 pc's from scratch over the years. Almost always ASUS..Early days... Motherboads required a dedicated graphics card. (AGP)Then many systems I built for basic use had on-board chipsets and did VGA (no dedicated graphics card needed but could expand if you wanted)Last system I built 6-7 yrs ago, I think (don't quote me) had GPU integrated in the CPU. no dedicate graphics needed..I bought this board on a combo email offer.. Seen the VGA on the Motherboard and assumed with a new Ryzen 5x Chip I'm good to go.. NOT SO ! I got no video and 3 beeps. Google search and calling tech support says 3 beeps is a memory issue. Read on MC forum new AMD chips too new.. Need to upgrade BIOS.. Upgrade BIOS.. Same thing. Called Microcenter support and tech agreed memory issue.. (whish he would have asked about video card. Maybe he assumed I was more knowledgeable than I am/was). Now I know !Drive into microcenter next day. People there GREAT as always.. 3 beeps not memory, but due to no graphics card. got a basic PCIe 2.0 card and BINGO.. no error beeps and display.Bottom line, unless you have a CPU with graphics (maybe an older AMD) plan on getting a dedicated graphics card.Hope this helps someone save some time!If I run into any issues with the board I'll append this review.
Bought this because it was a low cost mATX board for my home theater build and would allow me to reuse an older Ryzen 1700 CPU. This board is good which is not shocking since it's built by ASUS. I'm very happy with it. I'm used to higher-end boards with more features but was really impressed with the quality of this board and it meets my needs well. System is running stable and without issues. Happy with this purchase and the build. Definitely recommend.
I have been using this motherboard for sometime now on my build, and so far it has been working so well for me. It has amazing features and if I ever run into troubles the manual helps me. I upgrade from a 350 motherboard and now to the 450 it works so well and amazing and the aura sync is amazing to adjust the rgb to give the pc a more aesthetic look. I would most definitely recommended this motherboard
| Memory | |
| Unbuffered memory | Y |
| Maximum internal memory | 128 GB |
| Supported memory clock speeds | 2133,2400,2666,2800,3000,3200,3300,3400,3466,3600,3733,3866,4000,4400 MHz |
| ECC | Y |
