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ASUS PRIME B450M-A/CSM AM4 AMD B450 SATA 6Gb/s USB 3.1 HDMI Micro ATX AMD Motherboard

Ships from United States.

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  • Powered by 2nd generation AMD Ryzen AM4 processors to maximize connectivity and speed with NVMe M.2, USB 3.1 Gen2, DDR4 and Gigabit LAN
  • ASUS Corporate Stable Model complimentary Advance Replacement and long lifecycle with a COM header and PS2 ports for legacy needs
  • 5X Protection III hardware-level safeguards provide component longevity and reliability
  • Aura Sync RGB header provides a nearly endless spectrum of colors with the ability to synchronize effects across an ever-expanding ecosystem of enabled products
  • Unique SafeSlot Core fortified PCIe slot prevents damage caused by heavyweight GPUs

  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Learn more about the ASUS PRIME B450M-A/CSM

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years
  • Read full details
  • Return Policies
    • Return for refund within: Non-refundable
    • Return for replacement within: 30 days
  • This item is covered by Newegg.com's Replacement Only Return Policy.
Ownership: 1 month to 1 year
Verified Owner
4/ 5
4th time buying this board 1/6/2020 9:51:15 AM

Pros: - It's a great board for the price, a solid 4 out of 5 eggs
- It has the standard modern Asus bios you would expect, which works pretty well for a bios.
- Provides average overclocking potential without the heavy price tag.
- I always love seeing 6 sata ports and 4 ram slots on a board.

Cons: - 1 board had to be RMA'd because of somewhat faulty LAN / USB ports... but stuff like that could happen with any board, so I don't hold it against them.
- Had a weird bios update with this newest board where it just did the bios update and then hung there in black screen for half an hour before I forced shutdown and it would not boot up properly for several attempts until it finally started working perfectly again and no issues since. Weirdest bios update issue I've ever seen. But the board works great so far, so who knows why it did that.
- Aside from those 2 random issues, my only minor complaint is the orange light on the board... why orange? I thought AMD standards was red. Also, the PCI-E light is bright and pointless. I don't know why it exists.

Overall Review: I keep buying / recommending this motherboard because it really is a pretty good motherboard for the price and works with so many builds. ppl generally don't need full size ATX boards anymore. The only reason I give it 4 out of 5 eggs is because of the issues I've gotten with them so far.

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Ownership: 1 month to 1 year
Verified Owner
4/ 5
High performance at afordable cost 12/23/2019 1:11:59 PM

Pros: - No glitch, CPU, Memory and Graphic card all fit and work well
- Performance is excellent for my need which are mainly running Windows 10 Pro, Video Edition, Music Edition, Office Enterprise, … No gaming.

Cons: - 1 PCI Express expansion slot. Does not let to much for future but that was a choice I made to reduce cost and since it was my first PC Build from scratch I was no sure about ASUS yet. However, considering what I just experienced I would have both the next level after to get the additional expansion slot.
- To ensure all goes well in the installation process, take the time to view installation video from EasyPCBuilder. It is worth the 20 minutes and it reduces any doubt you may have about doing it yourself.

Overall Review: - I would buy the same motherboard or a more advanced one from ASUS.
- No blue screen so far after 1 month of use.

Did you find this review helpful?
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Bundled board - working great! 12/16/2019 7:01:11 AM

Pros: Easy to configure in UEFI BIOS
Fit nicely in mid-sized case
Ample space to work around heatsink when connecting wires

Cons: Slightly clearer documentation for pin headers would be nice. Had to do some minor guesswork when connecting the case header cables. I guessed right first try, but it would have helped to include something in the manual instead of needing to rely on writing on the board itself.

Overall Review: I got this as part of a bundle with a Ryzen 7 2700, upgrading from a Core2 Quad system I've been using for several years. It was my first time dealing with a UEFI BIOS, and I enjoyed how intuitive it felt.

I've enjoyed ASUS products for several years, and hope to continue to do so for many years to come.

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Ownership: 1 week to 1 month
Verified Owner
2/ 5
okay motherboard 11/16/2019 10:43:54 AM

Pros: It works with a AMD Athlon 200GE

Cons: It will not post with a 3rd gen Ryzen, even with latest firmware.

Overall Review: I originally bought this to go along with a Ryzen 5 3600. It would not post with that cpu. I put a
AMD Athlon 200GE in it to post so that I could update firmware.. It still would not post with latest
firmware (version 1820 at the time of this review) with the Ryzen 5 3600.

0 out of 4 people found this review helpful. Did you?
Manufacturer Response:
Dear Joseph R.,

I'm sorry to hear that you are having issues with your CPU on this motherboard. How do you have the video output configured on this system? Are you still running the display cable from the motherboard? The Ryzen 5 3600 does not have integrated graphics, unlike your Athlon CPU. Please verify that your video output is coming from your GPU. Are you hearing any error tones from the motherboard? You may need to plug speakers in to check. If that suggestion doesn't work for you, please reach out to me at cl-lane@asus.com and include a link to this review for reference. I'd be happy to help you troubleshoot this further.

Thank you for choosing ASUS!

Best regards,
Lane
ASUS Customer Loyalty – US Support
Ownership: more than 1 year
Verified Owner
5/ 5
stevin c. 11/2/2019 4:20:14 PM

Pros: really great value / bios features great

Cons: .

Overall Review: really worked great with a ryzen 2600 and nvme m.2 revo

Did you find this review helpful?
5/ 5
Fantastic board 10/13/2019 9:19:53 AM

Pros: Everything about this board works with my Ryzen 2600, Gskill 1x16 2133Mhz, GTX570, and EVO 860

Seriously this things has never frozen, or given me a moment of hassle in 6 months of use now. hopefully it lasts a long time.

Cons: Only room for 1 Pci-e1x expansion card which will end up RIGHT below your 2-slot GPU and limit gpu air intake.

This was not a problem for me as I use the built in ethernet, but something to be aware of if you need pci-e expansion.

(The TUF version is a bit more pricey but has a better set up for expansion IMO, though I can't speak to anything else about that board as I don't own it)

Overall Review: yes

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Anonymous
Ownership: 1 month to 1 year
Verified Owner
3/ 5
Does not work well in my configuration 9/29/2019 8:23:33 PM

Pros: - 6 SATA (the reason I picked the board, use all of them)
- Good amount of options in bios. No abbreviated hdd names like in my old MSI board.
- Booted with Ryzen 3400G out of the box
- Runs solid when manages to boot

Cons: - Not a good match for me with Ryzen 3400G and G.Skill F4-3200C16D-16GVKB
- Takes time to figure out the voltage offset mode in bios

Overall Review: It booted right up with 3400G, I did not have to update bios. I switched right away to DOHCP/XMP profile in bios for 3200MHz memory speed and it booted fine. BUT! Every time I reboot now is like a roulette. And I am not changing anything in the bios. Sometimes it boots fine, sometimes it double- or triple-boots but still ends up at 3200MHz, and sometimes it does not post and resets to default 2133. Then if I restart again it may boot just fine. Once it boots, it runs solid for days at a time. It only froze on me when I played around with Ryzen Master (make sure to know where the cmos reset jumper is if you do that) and played with SOC voltage. I tried many things. Have the latest bios. But still the same issue. Kind of annoying even though I don’t reboot that often. Good thing I can save bios settings in profiles, so if I need to reset to defaults or clear cmos, I can load a profile with basic changes fast (like turn off LEDs, fan profile, etc).
It seems like the board sometimes is not saving some important memory-related settings and has to adjust by multi booting. By the way, the memory is not on the board’s QVL but the board is on the G.Skill’s QVL.

Did you find this review helpful?
Manufacturer Response:
Dear Valued Customer,

Thank you for your feedback. I'm sorry to hear that you are experiencing RAM stability issues with your motherboard, please accept my apologies. This is absolutely not the type of experience we want any of our customers to experience. As you noted, your RAM kit is not on this motherboard's QVL for Ryzen 3000 processors. I recommend replacing your current RAM kit for a compatible kit on the QVL at the rated speed. If you have any general or technical questions, please email me at cl-lane@asus.com and include a link to this review for reference.

Thank you for choosing ASUS!

Best regards,
Lane
ASUS Customer Loyalty – US Support
Ownership: 1 week to 1 month
Verified Owner
3/ 5
Nice mobo 8/13/2019 5:00:49 AM

Pros: - Affordable
- Works
- Easy MOBO to build with

Cons: - Only 2 fan headers
- Orange LED
- BIOS is kinda overwhelming to navigate compared to other brands

1 out of 1 people found this review helpful. Did you?
Manufacturer Response:
Dear Christopher B,

Thank you for taking the time to write this informative review. It’s very unfortunate to hear that you've not completely satisfied with the motherboard. Please note, this motherboard includes 1 CPU Fan and 2 Chassis Fan headers for a total of 3 Fan headers. You can navigate through the BIOS in both EZ Mode and Advance Mode by pressing "F7" to switch between modes. Was there a particular setting you wanted to adjust in the BIOS? If you need any further assistance, feel free to contact me at cl-adrian@asus.com. and I will help you to the best of my abilities. I am here to assist our customers with our products and dedicated in bringing a resolution to all issues that they may come across. Your case for reference is N190877609.


Thank you for choosing ASUS!

Best Regards,
Adrian
ASUS Customer Loyalty – US Support
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