















ASUS PRIME B840M-A-CSM DDR5 AM5 Micro-ATX Motherboard
R2141,00
- CPU: Supports AMD Ryzen 9000/ 8000/ 7000 Series Desktop Processors
- Socket: AM5
- Chipset: AMD B840
- Memory: 4 x DIMM slots | Max. 256GB | DDR5 7600+(OC)
- Storage: 3 x M.2 slots | 4 x SATA 6Gb/s ports
- Expansion Slots: 1 x PCIe 4.0 x16 | 2 x PCIe 3.0 x16
- Network: 1 x Ethernet 2.5 Gbps
- Warranty: 3 Years
- Description
- SPECS
- Brand
- Reviews (0)
Description
ASUS PRIME B840M-A-CSM: Reliable Foundation for Business and AI
The ASUS PRIME B840M-A-CSM is an expertly engineered micro-ATX motherboard designed for exceptional stability, reliability, and performance in modern business environments. As part of the ASUS Corporate Stable Model (CSM) program, it is the ideal choice for organizations needing a dependable foundation for AMD Ryzen 9000, 8000, and 7000 series processors. It offers a future-proof feature set including DDR5 memory, PCIe 4.0 connectivity, and the powerful ASUS Control Center Express for streamlined IT management.
Unique Features
- ASUS Corporate Stable Model: Guarantees a stable supply and a long product lifecycle (up to 36 months), with end-of-life notices to allow organizations to plan for product transitions effectively and reduce ownership costs.
- ASUS Control Center Express: Includes complimentary server-grade IT management software for comprehensive remote monitoring and control, simplifying IT operations and boosting productivity across your network.
- 8+2+1 Phase Digital Power Design: Delivers clean and efficient power to the processor, ensuring unwavering stability and consistent performance even under heavy, continuous workloads.
- AEMP for Enhanced DDR5 Performance: ASUS Enhanced Memory Profile automatically detects and optimizes settings for entry-level DDR5 modules, unlocking their full performance potential with a single click.
- 2.5Gb Ethernet: A high-speed LAN port reduces CPU overhead and offers exceptionally high throughput for faster, smoother data transfers, cloud access, and network operations.
- Pre-mounted I/O Shield: Safeguards rear ports from electrostatic discharge and damage while streamlining the installation process for faster and more convenient system deployment.
- ASUS 5X PROTECTION III: A comprehensive suite of hardware safeguards, including SafeSlot Core+, LANGuard, and Overvoltage Protection, ensures component longevity and system durability.
Quick Specs of the ASUS PRIME B840M-A-CSM
| Specification | Details |
|---|---|
| CPU Support | Supports AMD Ryzen 9000, 8000, 7000 Series Processors |
| Socket | AM5 |
| Chipset | AMD B840 |
| Memory Support | 4 x DDR5 DIMMs | up to 256GB | DDR5 7600+(OC) |
| Storage Options | 3 x M.2 slots | 4 x SATA 6Gb/s ports |
| Display Ports | 2 x DisplayPort | 1 x HDMI |
| USB Ports | 2 x USB 10Gbps (Type-A) | 1 x USB 5Gbps (Type-C) | 4 x USB 2.0 (Type-A) |
| Expansion Slots | 1 x PCIe 4.0 x16 | 2 x PCIe 3.0 x16 |
| LAN | Realtek 2.5Gb Ethernet |
| Wireless | N/A |
| Audio | Realtek 7.1 Surround Sound CODEC |
| Form Factor | micro-ATX |
Check out full specifications under the Specs tab.
Why Choose This Product?
This motherboard is more than just hardware; it is a strategic business solution. The ASUS Corporate Stable Model (CSM) program guarantees a long product lifecycle and stable supply, making it the perfect choice for businesses that require consistency and reliability across multiple system deployments. The included ASUS Control Center Express software provides powerful remote IT management capabilities out of the box, significantly reducing the total cost of ownership.
Engineered for the latest AMD Ryzen processors, the ASUS PRIME B840M-A-CSM features a robust digital power design, high-speed DDR5 memory support, and fast 2.5Gb Ethernet to handle modern workloads with ease. Hardware safeguards from the 5X Protection III suite ensure long-term durability, while user-friendly features like the pre-mounted I/O shield make deployment faster and more efficient for IT staff or individual builders.
| Model | PRIME B840M-A-CSM |
| CPU |
* Refer to ASUS for CPU support list. |
| Chipset | AMD B840 Chipset |
| Memory |
* Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information please refer to CPU/Memory Support list under the Support tab of product information site or visit ASUS. Adjustments will be made based on the specifications of mass-produced memory products available on the market. |
| Graphics |
* Graphics specifications may vary between CPU types. Please refer to AMD CPU specifications. |
| Expansion Slots | AMD Ryzen 9000 & 7000 Series Desktop Processors*
AMD Ryzen 8000 Series Desktop Processors
AMD B840 Chipset
* Please check the PCIe bifurcation table on the support site ASUS. |
| Storage | Total supports 3 x M.2 slots and 4 x SATA 6Gb/s ports AMD Ryzen 9000 & 7000 Series Desktop Processors
AMD Ryzen 8000 Series Desktop Processors
AMD B840 Chipset
* Specifications vary by CPU types. AMD RAIDXpert2 Technology
|
| Ethernet |
|
| USB | Rear USB (Total 7 ports)
Front USB (Total 7 ports)
* USB Type-C power delivery output: max. 5V/3A |
| Audio | Realtek 7.1 Surround Sound High Definition Audio CODEC*
Audio Features
* 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 |
| Internal I/O Connectors | Fan and Cooling Related
Power Related
Storage Related
USB
Miscellaneous
|
| Special Features | ASUS 5X PROTECTION III
ASUS Q-Design
ASUS Thermal Solution
ASUS EZ DIY
Aura Sync
|
| Software Features | ASUS Exclusive Software Armoury Crate
ASUS DriverHub
Remote Management Features |
| BIOS | 256 Mb Flash ROM, UEFI AMI BIOS |
| Manageability | WOL by PME, PXE |
| Accessories | Cables
Miscellaneous
Documentation
|
| Operating System | Windows 11, Windows 10 64-bit |
| Form Factor | Micro-ATX |
About the Brand
ASUS is one of the world’s most recognized and respected names in gaming and computing. With decades of innovation behind them, ASUS delivers top-tier motherboards, graphics cards, gaming laptops, monitors, and peripherals trusted by gamers, streamers, and professionals around the globe.
Under its acclaimed ROG (Republic of Gamers) and TUF Gaming sub-brands, ASUS offers cutting-edge products engineered for durability, speed, and style. Whether you're building a high-performance rig or looking for a powerhouse laptop, ASUS brings together elite design with breakthrough technology.
At OnlyGaming, we stock the latest ASUS hardware to take your gameplay, streaming, and creative performance to the next level. Choose ASUS for innovation that powers victory.

Reviews
There are no reviews yet.