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Asus Prime B450m-a/csm Am4 Amd B450 Sata 6gb/s Usb 3.1 Hdmi Micro Atx Amd Motherboard

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      • Description
      • Product Details
      • Customer Reviews
      • Q&A


      ASUS Prime B450 Series motherboards provide the solid foundation needed for your first build, plus flexibility to grow with your ambitions. We've melded all the good stuff that's packed into AMD Ryzen processors with essential ASUS design and engineering, so you benefit from industry-leading technologies including automated system tuning, comprehensive cooling controls, and immersive onboard audio. When you build with an ASUS Prime B450 Series motherboard, you build smart, easy and doesn't break the bank.

      Take advantage of next-generation connectivity and speeds with NVMe M.2, USB 3.1 Gen2, DDR4 compatibility, and native RAID support. 5X Protection III ensures excellent component longevity and reliability while Aura Sync RGB adds flair to your system. ASUS Fan Xpert and ASUS UEFI BIOS make tuning clicks away. Just tune to get the best cooling and the highest performance.

      • Unique SafeSlot Core fortified PCIe slot prevents damage caused by heavyweight GPUs
      • Intel B450 chipset
      • Micro ATX form factor
      • Supports DDR4 memory


      • ASUS Prime B450M-A/CSM AM4 Micro-ATX Motherboard
      • I/O Shield
      • 2 x SATA Cable
      • M.2 Screw Package

      Brand: Asus

      MPN: PRIME B450M-A/CSM

      UPC: 192876078808

      Compatibility: AM4

      Packaging: Retail

      Condition: New

      Rebate From | Valid Through 12/31/2019| Download Rebate Form

      Product Details

      PRIME B450M-A/CSM
      CPU Socket Type
      Processor Type
      AM4 socket for AMD Ryzen 2nd Generation/ Ryzen with Radeon Vega Graphics/ Ryzen 1st Generation Processors
      * Refer to for the AMD CPU support list.
      AMD B450
      Number of Memory Slots
      Memory Standard
      DDR4 3200(O.C)/ 3000(O.C)/ 2800(O.C)/ 2666/ 2400/ 2133
      * Refer to for the Memory QVL (Qualified Vendors List).
      Maximum Memory Supported
      Channel Supported
      Dual Channel
      PCI Express 3.0 x16
      AMD Ryzen 2nd Generation/ Ryzen 1st Generation Processors
      1 x PCIe 3.0/2.0 x16 (x16 mode)

      AMD Ryzen with Radeon Vega Graphics Processor
      1 x PCIe 3.0/2.0 x16 (x8 mode)
      PCI Express x1
      2 x PCI Express 2.0 x1 slots
      SATA 6Gb/s
      6 x SATA 6Gb/s
      1 x M.2 socket 3 with M Key, Type 2242/2260/2280/22110 (PCIE 3.0 x4 and SATA modes) storage devices support*
      * The M.2 Socket shares bandwidth with the SATA_5/6 ports, and therefore the SATA_5/6 ports cannot be used when an M.2 device is installed.
      Onboard Video Chipset
      Integrated Graphics in the AMD Ryzen with Radeon Vega Graphics Processors
      Multi-VGA output support: HDMI, DVI-D, D-Sub ports
      - Supports HDMI 2.0b with a maximum resolution of 4096 x 2160 @60Hz
      - Supports DVI-D, max. up to 1920 x 1200 @60Hz
      - Supports D-Sub, max. up to 1920 x 1200 @60Hz
      Audio Chipset
      Realtek ALC887
      Audio Channels
      8 Channels
      * Use a chassis with HD audio module in the front panel to support an 8-channel audio output.
      LAN Chipset
      Realtek RTL8111H
      Max LAN Speed
      1 x PS/2 keyboard (purple)
      1 x PS/2 mouse port (green)
      Video Ports
      1 x DVI-D port
      1 x D-Sub port
      1 x HDMI
      1 x RJ45
      USB 3.1
      2 x USB 3.1 Gen 2 ports
      4 x USB 3.1 Gen 1 ports
      Audio Ports
      3 Ports
      Onboard USB
      1 x USB 3.1 Gen 1 (up to 5Gbps) connector supports additional 2 USB 3.1 Gen 1 ports (19-pin)
      2 x USB 2.0 connectors supports additional 4 USB 2.0 ports
      Other Connectors
      1 x Aura RGB Strip Header
      1 x TPM header
      1 x COM port connector
      1 x CPU Fan connector (1 x 4-pin)
      2 x Chassis Fan connectors (2 x 4-pin)
      1 x S/PDIF out header
      1 x Front panel audio connector (AAFP)
      1 x System panel
      1 x Clear CMOS jumper
      1 x Speaker connector
      Form Factor
      Micro ATX
      Dimensions (W x L)
      9.6" x 9.5"
      Power Pin
      1 x 24-pin EATX Power connector
      1 x 8-pin ATX 12V Power connector
      Special Features:
      ASUS 5X Protection III:
      - ASUS SafeSlot Core: Fortified PCIe Slot prevents damage
      - ASUS LANGuard: Protects against LAN surges, lightning strikes and static-electricity discharges!
      - ASUS Overvoltage Protection: World-class circuit-protecting power design
      - ASUS Stainless-Steel Back I/O: 3X corrosion-resistance for greater durability!
      - ASUS DIGI+ VRM: 6 Phase digital power design
      ASUS Exclusive Features:
      - AI Suite 3
      - Ai Charger
      ASUS Quiet Thermal Solution:
      - Stylish Fanless Design Heat-sink solution
      - ASUS Fan Xpert 2+
      ASUS EZ DIY:
      - ASUS CrashFree BIOS 3
      - ASUS EZ Flash 3
      - ASUS UEFI BIOS EZ Mode
      - Multi-language BIOS
      ASUS Q-Design:
      - ASUS Q-Slot
      - ASUS Q-DIMM

      128MB Flash ROM, UEFI AMI BIOS, PnP, SM BIOS 3.1, ACPI 6.1, Multi-language BIOS, ASUS EZ Flash 3, ASUS CrashFree BIOS 3, F3 My Favorite, Last Modified log, F12 PrintScreen, ASUS DRAM SPD (Serial Presence Detect) memory information, F6 Qfan Control

      Operating System:
      Windows 10 64-bit

      Package Includes

      Customer Reviews

      Review Summary
      37.5% (3)
      37.5% (3)
      0.0% (0)
      12.5% (1)
      12.5% (1)
      By Deborah Jimenez
      Lots of problems
      The microphone port doesn't work, one of the fan headers doesn't deliver constant power, it says bluetooth in the wireless section there is no bluetooth. Half of the time the computer freezes on the bios loading screen so i have to hard reset the computer. This is a huge hassle cause i had to build my entire pc before finding all of these problems and now i have to go through the rma process, and buy thermal paste. Overall i am dissatisfied with this purchase.
      By Matias Niemi
      Good motherboard
      For the price this motherboard is the way to go for a second generation ryzen cpu
      By anonymous shopper
      If you are in the market for a budget mb for new ryzen chip, this does the job
      I had an a few issues with b350's coming from companies that guaranteed the latest bios was updated ( i dont have a boot kit nor an older chip to use and i didn't want to wait 2 weeks for the boot kit from amd) and after the 2nd 350 failed to come with the latest update i decided to spend $10 more and get a damn 450.I was pretty nervous upon ordering because i couldn't find any feedback on it besides the 1-2 reviews left on here at the time and they weren't very helpful for my project. I wanted a board that supported my 2200g (#1) and (#2) it could handle at least the average oc that most people oc this chip to. (and i was hoping it was durable enough)even googling this exact mb, you wont get much info from others and their experience but i can tell you from mine, it works perfectly fine with a 2nd gen ryzen. I love asus bios. I still have my z97-a from asus - that was about 5 years old and still works perfectly.Only reason i took a star off is because 2 days after purchasing the motherboard for 86.Xx it dropped to it's current price at 76.Xx - bad timing on my part? Maybe, idk. But if i would've known, i could've gotten a aftermarket cpu cooler off the bat rather than using the little baby stealth cooler that amd provides in the 2200g's temporarily.
      By Philippe Abraham
      Would buy again!
      Asus is a top brand known for solid build quality since i got into computers over 25 years ago. I bought this for a build for my dad (a school teacher), and i will buy it again, gladly, without hesitation for my next build(s). Since reliability is my first priority, i did not overclock the cpu. I did overclock the ram to its rated speed of 3000 mhz, and this board did that flawlessly (always be sure to check the motherboard manufacturer's website for the memory compatibility list).This board worked perfectly out the box. There is a firmware update available, but it was not necessary at the time of build with a ryzen 5 2400g cpu (asin b079d8fd28), 8 gb of corsair vengeance lpx 3000 mhz memory (asin: b0123zbpda), and an xpg sx8200 240 gb adata nvme ssd (asin b07blnfsqn). I did update the bios after everything was up and running, and that process was completely painless.Another reviewer commented that there was not good documentation for connecting the front panel connectors for things like the power switch, reset button, hdd indicator led, etc. I suspect he did not look at the online resources available from asus. There is a manual in the box with the motherboard, and these is supplemental information available on the asus product support site.Unless i need high-end overclocking capabilities, integrated rgb leds, or some other feature this board explicitly lacks, this will be my go-to board for ryzen based systems.
      By Rodrigo Delgado
      50/50 on being doa
      Pro: this mobo is very sleek and attractive if you're not trying to give off a gamer aesthetic, easy to install and overall a great value for the price, if it didnt have one major glaring issue... Which leads me to mycon: the item was doa, post'ed fine and powering other fans/led's i had on my system. But it did not display any picture or provide any power to my external devices. I.E keyboard/mouse. I want to assume that it was my psu, but upon question for troubleshooting, i was met with no support or context as to what could be causing this. Leaving me to chalk it up by myself.Overall, i've learned that purchasing from asus was a mistake and if you want a smoother, easier experience with products i would recommend against this company, at least for their lower end motherboards.
      By anonymous shopper
      Everything you need, nothing you don't
      Easy to setup in bios, including updating it via internet. Nice feature set, though a second m.2 slot would have been nice. Running rock solid stable and has good support for overclocking of the cpu and ram. Has no obnoxious rgb leds, but has a header for them if it matters to you. Don't be fooled by the "corporate stable model" - this mobo is no office slouch.
      By anonymous shopper
      Stable and solid, typical asus quality. No frills board for ryzen 2700x.
      I wanted a basic, stable motherboard for a ryzen 2700x cpu, that i could plug in and have work--this one was moderately priced, and has the b450 chipset. I didn't need the x470 chipset features so i chose this; it booted up and runs well with all 8 cores loaded 100% during renders. Plenty of connectivity (sata, pci-e slots) for the price. Just what i wanted. Note, the front header power pins are labeled, but the text is tiny.
      By Sofia Palo
      Mobo works great
      Update: oct 1, 2018the motherboard works fine, plenty of usb 3.0 ports (i use the pc to run an oculus rift, so i use a lot of the usb ports). I'm running a 2600x on it, with 16gb ddr4 3000 (c15) from corsair, pny 480gb nvme, 1tb ssd (evo 850), a bunch of old hard disk drives, and a zotac 1070 ti mini. The 2600x seems to be using its full precision boost 2 frequency. Feels (obviously) really fast.I wished this board was available with with a heatsink over the vrm, wifi/bluetooth, and two m.2 slots. It'd be my ideal micro atx board, as i don't want to have an atx tower (or even a small but wide atx one). I plan to use an 2700 in it, and i wanted to overclock but not very sure about how stable it'll perform with the weak vrm/no heat sink (and without holes to attach one over the circuitry).At first, i gave this motherboard a vengeful 1 star review, as its manual lacked a diagram about the power/reset button connections. This wasn't my first build, but i was just really annoyed to search for the mapping for power connections without finding it. Nevertheless, the comments about the polarity of the power button were right - it doesn't matter.Now, i'm not totally clueless about electricity and power. I'm used to reading datasheets for projects in college (i'm a computer engineering major), and i still think the lack of proper instructions for the connections - something that generally doesn't happen with sensors and other electronics parts - was frustrating, especially because i was finishing this build in a rush (it was in the middle of the night), so partly my bad. I didn't connect the fact that the power button in a computer was just a push button toggle switch and the reset, just a push button.However, i think it's elitism to think that only people who know these things should be allowed to build a pc without trouble and without professional help. It's the manual's job to help with this, as connections on the motherboard are pretty simple with the other hardware. Gosh, even applying thermal paste is something anyone can do with some care. So no: building a pc should not require professional assembly at all.To give a recent example, i built last year a pc that used the b350 version of this motherboard. That mobo's manual had a simple nice diagram for power connections, so i didn't have to think at all about what they meant when connecting everything and powering up the system.In sum, i'm not an expert, but i'm not a beginner either. So, if i wanted a simple, nice diagram for that, i imagine others would benefit from a diagram printed on the manual, as well. Just like the previous version of this mobo had.And that's my only criticism about this b450 motherboard, because the price is right. Although for those shopping for a ryzen matx mobo right now, it seems the msi mortar has the best vrms among am4's matx (with a heat sink over them, of course). It's likely a better choice for the 2700x and for overclocking the apus.Original review:incredibly enough, the manual doesn’t state how to connect the power button jumper, and the “diagram” on the motherboard is not very helpful either. Frustating. This process should never be a trial and error thing.


      Question & Answers
      By OutletPC Shopper on 2019-04-12
      Recently bought this and windows 10 and cant find info on rebate process. Please help!

      By Customer Service on 2019-05-09

      The mail-in rebate form is downloadable from the product page on the OutletPC website. There is a link highlighted in green located on the lower right hand corner of the product description area. Clicking on that link will take you to the form for printing. Hope this helps.

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      PRIME B450M-A/CSM

      Asus Prime B450m-a/csm Am4 Amd B450 Sata 6gb/s Usb 3.1 Hdmi

      Price: $99.08
      FREE Shipping!