SKU: 63316463218

Asus PRIME B840M-A-CSM AM5 Micro ATX Motherboard

$1027.80 $1142.00
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Ships within 48 hours · Estimated delivery Aug 26 - Aug 31

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Description

Asus PRIME B840M-A-CSM AM5 Micro ATX MotherboardQuick Specs Supports AMD Ryzen 7000 8000 9000 Series Desktop Processors. Features a PCIe 4. 0 slot for lightning fast gaming experiences. Includes SafeSlot Core+ for enhanced PCIe slot retention and durability. Simplifies builds with Q LED Core for easy troubleshooting. Offers BIOS FlashBack for convenient BIOS updates. Built for AMD Ryzen Processors Designed to fully support the latest AMD Ryzen 7000, 8000 and 9000 Series desktop processors, the ASUS

Quick Specs



  • Supports AMD Ryzen 7000/8000/9000 Series Desktop Processors.

  • Features a PCIe 4.0 slot for lightning-fast gaming experiences.

  • Includes SafeSlot Core+ for enhanced PCIe slot retention and durability.

  • Simplifies builds with Q-LED Core for easy troubleshooting.

  • Offers BIOS FlashBack for convenient BIOS updates.


Built for AMD Ryzen Processors


Designed to fully support the latest AMD Ryzen 7000, 8000 and 9000 Series desktop processors, the ASUS B840M AM5 Motherboard is ready to deliver exceptional computing power. Ideal for gamers, content creators, and anyone seeking a high-performance PC, it ensures seamless compatibility and optimised performance with your chosen Ryzen CPU.


Experience Lightning-Fast Gaming with this ASUS AM5 Motherboard


The PCIe 4.0 slot provides double the bandwidth compared to the previous generation, unlocking lightning-fast speeds for modern GPUs and NVMe SSDs. Gamers will appreciate reduced loading times and smoother gameplay, while creative professionals can benefit from quicker data transfers for large files and complex projects. This AM5 Micro ATX Motherboard is built to handle it all.


EZ PC DIY Features


Building or upgrading your PC is now easier than ever with ASUS's innovative DIY-friendly features. SafeSlot Core+ provides stronger PCIe slot retention and greater shearing resistance, ensuring your graphics card stays securely in place. Q-LED Core simplifies troubleshooting by indicating potential issues with key components, while the pre-mounted I/O shield streamlines installation and protects against electrostatic discharge.


Stay Cool and Reliable


Effective thermal management is essential for maintaining peak performance, and this ASUS AM5 Motherboard is equipped with comprehensive cooling solutions. Multiple heatsinks and strategically placed fan headers keep temperatures in check, preventing thermal throttling and ensuring long-term reliability, even under heavy workloads.


Future-Proof Connectivity


With a range of USB ports, including USB Type-C, this B840M AM5 Micro ATX Motherboard offers versatile connectivity options for all your peripherals and devices. Fast Ethernet ensures reliable network performance for online gaming and seamless streaming, while high-definition audio delivers immersive sound quality for an enhanced entertainment experience.


FEATURES:



  • Intel B840M Chipset

  • Supports AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors

  • Supports DDR5 Memory, Dual Channel DDR5 7600+ MT/s (OC) 256GB max capacity

  • Ultra-fast Realtek 2.5G Ethernet LAN

  • Lightning Fast Game experience: PCIe 4.0 slot support

  • Asus Fan Xpert 2+ for more cooling control

  • EZ PC DIY: SafeSlot Core+ and Q-LED Core, BIOS Flashback, and a pre-mounted I/O shield for easy usage

  • Aura Sync support for full RGB lighting control


SPECIFICATIONS:



  • CPU:

    • AMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors*

    • * Refer to https://www.asus.com/support/download-center/ for CPU support list.



  • Chipset: AMD B840 Chipset

  • Memory:

    • 4 x DIMM slots, max. 256GB, DDR5

    • Supports up to 7600+MT/s (OC) with Ryzen™ 9000 & 8000 & 7000 Series Processors, ECC and Non-ECC, Un-buffered DIMM*

    • Dual channel memory architecture

    • Supports AMD Extended Profiles for Overclocking (EXPO™)

    • ASUS Enhanced Memory Profile (AEMP)

    • * Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration

    • * Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.



  • Graphics:

    • 2 x DisplayPort**

    • 1 x HDMI™ port***

    • * Graphics specifications may vary between CPU types. Please refer to AMD CPU specifications.

    • ** Supports max. 8K@30Hz as specified in DisplayPort 1.4.

    • *** Supports 4K@60Hz as specified in HDMI 2.1.



  • Expansion Slots:

    • AMD Ryzen™ 9000 & 7000 Series Desktop Processors*

    • 1 x PCIe 4.0 x16 slot (supports x16 mode)

    • AMD Ryzen™ 8000 Series Desktop Processors

    • 1 x PCIe 4.0 x16 slot (supports x8/x4 mode)**

    • AMD B840 Chipset

    • 2 x PCIe 3.0 x16 slots (support x1 mode)

    • * Please check the PCIe bifurcation table on the support site (https://www.asus.com/support/FAQ/1037507/).

    • ** Specifications vary by CPU types.

    • To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.



  • Storage:

    • Total supports 3 x M.2 slots and 4 x SATA 6Gb/s ports

    • AMD Ryzen™ 9000 & 7000 Series Desktop Processors

    • M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)

    • M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)

    • AMD Ryzen™ 8000 Series Desktop Processors

    • M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)

    • M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4/x2 mode)*

    • AMD B840 Chipset

    • M.2_3 slot (Key M), type 2280 (supports PCIe 3.0 x4 mode)

    • 4 x SATA 6Gb/s ports

    • * Specifications vary by CPU types.



  • RAID:

    • AMD RAIDXpert2 Technology

    • Ryzen™ 9000 Series Processors: RAID 0/1/5/10

    • Ryzen™ 8000 Series Processors: RAID 0/1

    • Ryzen™ 7000 Series Processors: RAID 0/1/10



  • Ethernet:

    • 1 x Realtek 2.5Gb Ethernet

    • ASUS LANGuard



  • Rear USB (Total 7 ports):

    • 2 x USB 10Gbps ports (2 x Type-A)

    • 1 x USB 5Gbps port (1 x USB Type-C®)

    • 4 x USB 2.0 ports (4 x Type-A)



  • Front USB (Total 7 ports)

    • 1 x USB 5Gbps connector (supports USB Type-C®)

    • 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports

    • 2 x USB 2.0 headers support 4 additional USB 2.0 ports

    • * USB Type-C® power delivery output: max. 5V/3A



  • Audio:

    • Realtek 7.1 Surround Sound High Definition Audio CODEC*

    • Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking

    • Supports up to 24-Bit/192 kHz playback



  • Audio Features:

    • Audio Shielding

    • Premium audio capacitors

    • Dedicated audio PCB layers

    • *A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.



  • Back Panel I/O Ports:

    • 2 x USB 10Gbps ports (2 x Type-A)

    • 1 x USB 5Gbps port (1 x USB Type-C®)

    • 4 x USB 2.0 ports (4 x Type-A)

    • 2 x DisplayPort

    • 1 x HDMI™ port

    • 1 x Realtek 2.5Gb Ethernet port

    • 3 x Audio jacks

    • 1 x BIOS FlashBack™ button



  • Operating System: Windows 11, Windows 10 64-bit

  • Form Factor: Micro ATX


WHAT’S IN THE BOX:



  • Asus PRIME B840M-A-CSM AM5 Micro ATX Motherboard – Black x1

  • SATA Cables x2

  • M.2 rubber package x1

  • Screw Package for M.2 SSD x2

  • Quick Start Guide x1


Why Asus?


ASUS is a globally recognised tech company renowned for quality and innovation. For over three decades, ASUS has consistently delivered cutting-edge PC components and electronics, earning the trust of gamers, professionals, and everyday users alike. Choose ASUS for reliability, performance, and a commitment to pushing the boundaries of what's possible. When building your next PC, an ASUS AM5 motherboard is a solid foundation.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 63316463218

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4.6 ★★★★★
Based on 18 reviews
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Product Reviews
J
Verified Purchase
Johnny
Birmingham, US
★★★★★ 5
Very nice
Color: A Silver, Size: 32 Ounces
These are solid construction and work great for frothing. Look good and easy to use. Very good size.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 18, 2026
C
Verified Purchase
Caps
Lexington, US
★★★★★ 5
Will use for rest of my life
Color: A Silver, Size: 12 Ounces
Really like the simple design and quality. Feels sturdy and something we will use for the rest of our lives.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 10, 2026
G
Verified Purchase
Golly
Battle Creek, US
★★★★★ 5
Great product!
Color: A Silver, Size: 12 Ounces
It’s perfect and easy to clean
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 12, 2026
H
Verified Purchase
Hanna
Houston, US
★★★★★ 5
Still The Best Frother Ever!
Color: Black
I love how it is easy to use, how it holds a charge, and how much power it has. I've only charged it once since I got it & I've been using it on a daily basis!!! Though it isn't a long time, I'm happy with it so far! I definitely will recommend it to anyone looking for a great frother. If you are looking for one, look no further! You won't be disappointed! I've read some comments where they found it to be too strong that their drink spilled everywhere. But for me I have not had any incident of spilling over. I have used it both for my coffee and my matcha tea and it worked great without any spilling over. You just have to start with the lowest power and ensure that you have a large enough container to have a room for your frothing. My sister tried to use it recently during her visit to make us matcha tea. However, she experienced spillage all over the cup, because she had used a small cup. Otherwise, she liked it very much and said she will get one when her battery operated one stops working... Another thing I like about the product was the customer service that I had received. When I got my first order which came quickly, it wasn't working after having charged it over 24 hours. It was not turning on at all. I returned it and ordered a replacement which I received within a day or two. This time after charging it for the recommended amount of time, I was a bit skeptical when I turned it on. However, I was pleasantly surprised that it worked like it was supposed to and it has been working ever since having charged it only once so far. I may come back and give an update depending on how it does after 6 months of use, so keep in tune... I don't know if there is a way to write a new entry as a follow up to the old entry, so I'm going to add my follow up comment over here. May 23, 2025 - I love my frother more than I can say in words. It's functionality has not changed a bit from the time I have purchased it. It charge lasts several weeks to few months before I charge it again and the power is still the same. Recently I decided to buy another one for my office use. I like the white color and so tried it but that one wouldn't even turn on. And then I got a gray one to have a different color. That one was much weaker than the black one I own. Then I replaced it with another gray one within few days. I tried it and it was exactly the same as the one I already replaced. So then I decided to go with a black one again hoping that it would be the same as the one I have. The black one did much better than the gray ones in the strength or power of the frother. However, it is weaker than the one I already have been using since last August. While I am not very happy with the quality being inconsistent in all of the ones I have tried including the recent pictures of the black one, I have decided to keep the black one because it is relatively better than the gray ones I tried. What I don't understand is why there is inconsistency in the quality of the same product by the same maker. I am beginning to wonder if the black one I purchased in Augusta last year was anomaly of a quality and a good way. Maybe I lucked out on my older black frother, but I'm unsure if quality is going to get better if I were to order another one. I have a sister who is a pro in making coffee drinks and she was the reason I had ordered this frother to begin with. She uses a battery operated one at this time and I have been thinking about getting her one like mine. While I am still skeptical, I am going to give it a shot and order her one sometime soon. If it doesn't work, I guess we will return it back. But one thing that I am grateful is that I have been able to return every one of those that I have tried recently with no issues. I hope that I don't have to return my most recent purchase in black. I was not even able to review the new purchase because of the item being the same color which is crazy.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 8, 2024
R
Verified Purchase
R. Cordosi
Pawtucket, US
★★★★★ 5
Outstanding Frother!
Color: Space Gray
Exceptional! This frother is in another league compared to the cheapo push button frothers. The motor is smooth, quiet and powerful. This has an intuitive thumb dial on top that operates smoothly with a wide range of smooth speed adjustment. It’s gentle enough to froth a little bit of milk for a macchiato and powerful enough to scramble 3 eggs. The head is removable for easy cleaning. It’s also rechargeable. I charged this the day I bought it on April first. I use it at least twice a day. It’s September 26th today and I have yet to recharge it and it’s not showing any signs of needing a charge. One minor quibble is that they give you 2 of the same frother heads. They are built so well, that I don’t imagine it ever wearing out. It would have been nice to get a whisk or something different. Not a deal breaker at all though.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 26, 2025

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