SKU: 47493228962

Asus PRIME B840M-A-CSM AM5 Micro ATX Motherboard

$1146.91 $1274.35
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Ships within 48 hours ยท Estimated delivery Jul 18 - Jul 23

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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.



Dimensions (LxWxH): 28.0 x 28.0 x 7.0 cm
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: 47493228962

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4.9 โ˜…โ˜…โ˜…โ˜…โ˜…
Based on 24 reviews
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Product Reviews
K
Verified Purchase
Kavisha Shah
New York, US
โ˜…โ˜…โ˜…โ˜…โ˜… 5
Cute Expresso Shot Cup!!
Color: White, Size: 4.1 Ounces
Sucha cute expresso shot cup!! I make all my coffess in this cup!! Its not even that short nor too big !! Works great for double expresso shot!! Truely in love with the cup!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 15, 2026
A
Verified Purchase
Abraham y Jetzabel
Houston, US
โ˜…โ˜…โ˜…โ˜…โ˜… 5
Good product.
Color: Bright Silver 2 Pcs, Size: 4.1 Ounces, Color: Bright Silver 2 Pcs, Size: 4.1 Ounces
The measuring jug is resistant, made of stainless steel and with clear marks that make it easier to measure liquids accurately from the inside. The handle is comfortable and the pourer helps to serve without spills that is always a mess at that moment.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 19, 2026
D
Verified Purchase
D
Los Angeles, US
โ˜…โ˜…โ˜…โ˜…โ˜… 5
Great scale that needs some improvements to be perfect
Color: White, Color: White
Very accurate scale, looks good in white, timer works nicely and I do like the concept of the ratio conversion. Shown in photos with 0 measurement drift over time, even without the silicone mat. To make this the best scale in the price range, I would change: - The auto timer function. Timing currently stops if you pick up the brew to swirl; you must completely restart the process if you do happen to pick it up. I would change that to only stop on user input (pressing a button). - The ratio conversion. Why offer XX.0 precision if you can only change the ratio in whole amounts? I'd suggest offering 0.1 increments, selectable with +/- buttons instead of cycling through. - The silicone mat is not well affixed and slides around. Kind of useless as-is and I just keep it off. I would wrap the whole thing around the measurement platform, similar to how the Greater Goods scale does it, to really keep it secure. It's not perfect, but for the price, it's a 4.5/5 for me. Rounding up to 5 since a 4 is considered "bad" by today's online rating standards.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 22, 2025
D
Verified Purchase
donttellitme
Boise, US
โ˜…โ˜…โ˜…โ˜…โ˜… 5
IMO, a filter coffee lovers best scale option on a budget. Solid grade A choice.
Color: Black
I have two other .1mg "coffee" or food scales that I used regular for pour overs. I saw this has 4x display on real time flow rate, g/mg weight, timer, and grounds to water ratio for a solid price and purchased this after reading some reviews. One of my scales has these features, but the workflow on this scale just clicked a ton better for me. The beep isn't super loud annoying which is a major relief, as I just couldn't keep sound on on my other scale due to that trigger honestly. I tried brew mode immediately and will now only use that when making a pour over. Loved the beep alerting when I finally hit the proper ratio and I like it keeps my final info on screen after the brew for my study. I can actually practice my technique now and not have split attention as much. This is still compact, but fits a larger carafe well whereas my other scale is a better fit for the espresso machine. The display is clear and buttons have a slight tactile sensation from the print, but are still the capacitive touch based style. I tested it with weights and it is my most accurate scale, it hit the .1g accurately every time or at worst would fluctuate back and forth quickly from the true value (more than enough for me to trust it). It updates and tares from power on fairly fast, it reacts fast enough to touch to not make me pause much. My nitpicks are that the front clear matte plastic isn't quite uniform flat viewed at an off angle giving it a cheaper look, but that doesn't affect functionality at all and truth is, it really was very affordable for the feature set I feel. The second nitpick was that the scale's mat does not grip well or fit securely over prompting it to move around easily. For this I had to modify using some rubberized grip tape on the surface of scale underneath the mat itself. Now it doesn't slide from vibration and if any pressure down it doesn't slip. I could have removed it totally, but it is attractive and useful once stabilized. With that modification done, I can fully recommend this scale for filter coffee lovers at any price. Great product, hopefully lasts me a long time.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 16, 2025
J
Verified Purchase
Jrmaxim
Lowell, US
โ˜…โ˜…โ˜…โ˜…โ˜… 5
Top of the line scale.
Color: Black
Fantastic scale. The best coffee scale I have ever owned and can be used for all kinds of kitchen items as well.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026

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