ASUS PRIME B840M-A-CSM DDR5 AM5 Micro-ATX Motherboard

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
Availability: 41 in stock SKU: 90MB1J10-M0EAYC Category:
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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

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

* Refer to ASUS 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, 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.
* 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 ASUS.
** Specifications vary by CPU types.
– To ensure compatibility of the device installed, please refer to ASUS 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.

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
USB 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
Internal I/O Connectors Fan and Cooling Related

  • 1 x 4-pin CPU Fan header
  • 1 x 4-pin CPU OPT Fan header
  • 2 x 4-pin Chassis Fan headers

Power Related

  • 1 x 24-pin Main Power connector
  • 1 x 8-pin +12V CPU Power connector

Storage Related

  • 3 x M.2 slots (Key M)
  • 4 x SATA 6Gb/s ports

USB

  • 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

Miscellaneous

  • 3 x Addressable Gen 2 headers
  • 1 x Clear CMOS header
  • 1 x COM Port header
  • 1 x Front Panel Audio header (F_AUDIO)
  • 1 x S/PDIF Out header
  • 1 x SPI TPM header (14-1 pin)
  • 1 x 10-1 pin Front Panel System header
Special Features ASUS 5X PROTECTION III

  • DIGI+ VRM
  • LANGuard
  • Overvoltage protection
  • SafeSlot Core+
  • Stainless-steel back I/O

ASUS Q-Design

  • Q-Dashboard
  • Q-DIMM
  • Q-LED Core
  • Q-Slot

ASUS Thermal Solution

  • M.2 heatsink
  • VRM heatsink design

ASUS EZ DIY

  • BIOS FlashBack button
  • BIOS FlashBack LED
  • Pre-mounted I/O shield

Aura Sync

  • Addressable Gen 2 headers
Software Features ASUS Exclusive Software
Armoury Crate

  • Aura Creator
  • Aura Sync
  • Fan Xpert 2+
  • Power Saving

ASUS DriverHub
TurboV Core
ASUS CPU-Z
Norton 360 Deluxe (60 Days Free Trial)
WinRAR (40 Days Free Trial)
UEFI BIOS
ASUS EZ DIY

  • ASUS CrashFree BIOS 3
  • ASUS EZ Flash 3
  • ASUS UEFI BIOS EZ Mode
  • ASUS MyHotkey

Remote Management Features
IT Management software supported
– ASUS Control Center Express (ACCE)

BIOS 256 Mb Flash ROM, UEFI AMI BIOS
Manageability WOL by PME, PXE
Accessories Cables

  • 2 x SATA 6Gb/s cables

Miscellaneous

  • 1 x M.2 rubber package
  • 2 x Screw packages for M.2 SSD

Documentation

  • 1 x ACC Express Activation Key Card
  • 1 x Quick start guide
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.

Trusted Brands Only
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Built For Every Setup
BUILT FOR EVERY SETUP From core components to complete battlestations.
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