ASUS 

ASUS MB PRIME B840-PLUS WIFI-CSM B840 AM5 max256GB DDR5 ATX Retail

Mfg Part Number:  PRIME B840-PLUS WIFI-CSM  
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Price: $243.44
Quantity:
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Last Updated: Aug 16, 2026
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ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen 9000 series processors. The PRIME B840-PLUS WIFI-CSM motherboard provides users and PC DIY builders with a range of performance optimizations via intuitive software and firmware features. It's designed to be Advanced AI PC-ready, offering the power and connectivity needed for demanding AI applications.

ASUS Control Center Express

ASUS Control Center Express is an integrated IT monitoring and management software designed to deploy faster, simplify IT operations and improve productivity with comprehensive control and user-friendly functions. ASUS Control Center Express is compatible with over 100 ASUS motherboards to provide a high-quality, TCO-optimized solution for your business needs.

Optimize IT endpoint management

Designed to assist IT staff in monitoring and controlling devices within their corporate networks, and facilitate inventory checking in multiple locations remotely.

Automate IT maintenance

Allows IT staff to schedule automatic updates of the latest BIOS, software and utilities to specific or all devices at off-peak times, enhancing system stability and IT operational flexibility.

Securely manage all of endpoints

Securely manage endpoint configuration, portable storage access and PC software applications by enabling them to create grouping rules on individual devices.

Performance

AI Solutions

ASUS AI Solutions include AI Advisor as your technical expert with expertise in PC performance.

AI Advisor

ASUS AI Advisor allows users to explore the functionality and advanced features of ASUS motherboards in a simple and straightforward way

Performance

Digital Power Design

PRIME B840-PLUS WIFI-CSM features an 8+2+1 phase power design with discrete MOSFETs, ensuring efficient and stable power delivery for AMD processors plus steady performance for day-to-day use.

Enhanced Memory & Storage Performance

Enhanced DDR5 performance

Comprehensive memory tuning options are the cornerstone of PRIME motherboards. The PRIME B840-PLUS WIFI-CSM maximizes the potential of your DDR5 modules, from entry-level to extreme-speed kits.

For entry-level modules without EXPO support,ASUS Enhanced Memory Profile (AEMP)automatically detects memory chips and provides optimized profiles for enhanced performance.

For those looking to surpass stock DDR5 speeds, the PRIME B840-PLUS WIFI-CSM offers extensiveAMD Extended Profiles for Overclocking (EXPO)support and a wide array of UEFI settings for further performance tweaks

Three M.2 slots (up to 64 Gbps)

PRIME B840-PLUS WIFI-CSM offers a total of three M.2 slots, including two that support data-transfer speeds of up to 64 Gbps via PCIe 4.0, and one that supports PCIe 3.0. This enables quicker boot-up and app load times with OS or application drives.

Cooling

Cooler by design

The PRIME B840-PLUS WIFI-CSM motherboard is engineered with multiple onboard heatsinks and an array of hybrid fan headers to help ensure your rig stays cool and stable under intense workloads.

Main Specification
General Information
Manufacturer ASUS Computer International
Manufacturer Part Number PRIME B840-PLUS WIFI-CSM
Manufacturer Website Address http://usa.asus.com
Brand Name Asus
Product Line Prime
Product Model B840-PLUS WIFI-CSM
Product Name Prime B840-PLUS WIFI-CSM Gaming Desktop Motherboard
Product Type Gaming Desktop Motherboard
Technical Information
AI-powered Yes
Processor & Chipset
Chipset Manufacturer AMD
Chipset Model B840
Total Processor Supported 1
Processor Socket Socket AM5
Processor Supported Ryzen 9
Processor Supported Ryzen 7
Memory
Number of Memory Slots 4
Memory Form Factor UDIMM
Memory Form Factor DIMM
Maximum Memory Supported 192 GB
Memory Technology DDR5 SDRAM
Memory Speed Supported 7600 MHz
Error Checking ECC
I/O Controller
Controller Type Serial ATA/600
RAID Supported Yes
RAID Levels 10
RAID Levels 5
RAID Levels 0
RAID Levels 1
Video
Onboard Video CPU Dependent Video
Audio
Audio Channels 7.1
Network & Communication
Bluetooth Yes
Bluetooth Standard Bluetooth 5.3
Gigabit Ethernet Yes
2.5Gigabit Ethernet Yes
Wireless LAN Yes
Wireless LAN Standard IEEE 802.11ax
I/O Expansions
Total Number of Expansion Slots 6
PCI Express Standard PCI Express 4.0
PCI Express Standard PCI Express 3.0
Total Number of PCI Express Slots 6
Number of PCI Express x1 Slots 1
Number of PCI Express x16 Slots 5
Interfaces/Ports
Total Number of USB Ports 8
S/PDIF Yes
HDMI Yes
HDMI Version
  • 2.1
  • DisplayPort Yes
    Thunderbolt Yes
    Number of Thunderbolt 4 Ports 2
    Onboard Interfaces
    Number of SATA Interfaces 4
    Number of M.2 Interfaces 3
    Total Number of Onboard USB Ports 7
    Number of Onboard USB 2.0 Ports 4
    Onboard S/PDIF Header Yes
    Physical Characteristics
    Form Factor ATX
    Height 12"
    Width 12"
    Depth 9.6"
    Weight (Approximate) 2.43 lb
    Miscellaneous
    Brand Compatibility AMD
    WARNING:: The plastic used in cable products can expose you to lead and lead components, chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov
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