The ASUS Prime B850M‑A WiFi‑CSM Motherboard features an AM5 socket supporting AMD Ryzen 7000, 8000, and 9000 Series processors, along with DDR5 memory, PCIe 5.0 x16 graphics slot and a PCIe 5.0 M.2 slot for ultra-fast storage. It also includes integrated WiFi 6E, Realtek 2.5 Gb Ethernet, USB 10 Gbps Type‑A rear ports plus front USB‑C 5 Gbps header and three Gen 2 addressable RGB headers with Aura Sync support.
Warning: This product contains a button battery
- If swallowed, a lithium battery can cause severe or fatal injuries with 2 hours.
- Keep batteries out of reach of children.
- If you think batteries may have been swallowed or placed inside any of the body, seek immediate medical attention.
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Features
Prime B850M-A WiFi-CSM
ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen™ 9000 series processors. The PRIME B850M-A WIFI-CSM motherboard provides users and PC DIY builders with a range of performance optimisations 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.
- 8+2+1 phase digital power design
- AEMP for enhanced DDR5 performance
- 2.5Gb Ethernet for faster data transfers
- WiFi 6E for stable WiFi connection and lower latency
- USB 5Gbps Type-C® for rapid data transmission
- PCIe 5.0 slots for graphics card and storage
- EZ PC DIY for easier build customisation
- Pre-mounted I/O shield for safeguarding ports and enhancing aesthetics
- Aura Sync for full RGB lighting control
Performance
- AM5 Socket for AMD Ryzen™ Desktop processors
- 1 x PCIe 5.0 x16 (supports x16 mode)
- SafeSlot
- 1 x PCIe 4.0 x16 (supports x1 mode)
- 8+2+1 phase digital power design
- 4 x DIMM slots
- DDR5 support
- Dual channel
- AEMP
- M.2_1 2280 (PCIe 5.0 x4 mode)
- M.2_2 2280 (PCIe 4.0 x4 mode)
- M.2_3 2242/2260/2280 (PCIe 4.0 x4 mode)
Cooling
- VRM heatsink
- M.2 heatsink
- Chassis fan header
- CPU OPT fan header
- CPU fan header
- AIO pump fan header
- Chipset heatsink
- 2 x Chassis fan headers
Flexibility
- 4 x USB 2.0 Type-A
- 2 x DisplayPort
- HDMI™ port
- BIOS FlashBack™ button
- 2.5Gb Ethernet
- 2 x USB 5Gbps Type-A
- 2 x USB 10Gbps Type-A
- WiFi 6E
- 3 x Audio jacks
- 1 x USB 5Gbps header (supports 2 additional USB 5Gbps ports)
- 1 x USB 5Gbps connector (supports USB Type-C®)
- 2 x USB 2.0 headers (support 4 additional USB 2.0 ports)
- 4 x SATA 6Gbps ports
Customisation
- 2 x Addressable gen 2 headers
- 1 x Addressable gen 2 header
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-optimised solution for your business needs.
Optimise 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. (Availability of ASUS AI Advisor may vary by region. AI Advisor functions may vary by platform.)
ASUS AI Advisor is an ASUS technical expert that's always available to answer your questions. Owners of compatible ASUS motherboards can interact with this AI-powered technology using natural language to learn more about their hardware. For DIY beginners, it can provide easy-to-understand explanations of one-click optimisation features like fan speed tuning, and for seasoned PC-building veterans, it can offer guidance and instructions on the latest features offered by ASUS. (Availability of ASUS AI Advisor may vary by region. AI Advisor functions may vary by platform.)
Digital Power Design
PRIME B850M-A 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.
- 8 Vcore power
- 2 SOC power
- 1 Misc power
Six-Layer PCB Design
Enhanced Stability and Overclocking
The multi-layered printed circuit board design quickly dissipates heat around the voltage regulators to improve overall system stability and provide the CPU with more overclocking headroom.
Digi+ VRM Control
Real-Time Voltage Control
The Digi+ voltage-regulator module (VRM) delivers real-time control over voltage droop, automatically switching frequency and power-efficiency settings.
Enhanced Memory & Storage Performance
Enhanced DDR5 Performance
Comprehensive memory tuning options are the cornerstone of PRIME motherboards. The PRIME B850M-A WIFI-CSM maximises the potential of your DDR5 modules, from entry-level to extreme-speed kits. (Memory overclocking may vary between CPU series. Please refer to the spec table for detailed information.)
For entry-level modules without EXPO™ support, ASUS Enhanced Memory Profile (AEMP) automatically detects memory chips and provides optimised profiles for enhanced performance.
For those looking to surpass stock DDR5 speeds, the PRIME B850M-A WIFI-CSM offers extensive AMD Extended Profiles for Overclocking (EXPO™) support and a wide array of UEFI settings for further performance tweaks. (Supported memory types, data rates (speed), and number of DRAM modules vary depending on the CPU and memory configuration. For more information, please refer to the CPU/Memory Support List under the Support tab on the product information page or visit https://www.asus.com/support/download-center/.)
Three M.2 Slots (Up to 64 Gbps)
PRIME B850M-A WIFI-CSM offers a total of three M.2 slots, including one that supports data-transfer speeds of up to 128 Gbps via PCIe 5.0, and two that support PCIe 4.0. This enables quicker boot-up and app load times with OS or application drives. (Actual transmission speeds will be lower than the theoretical maximum speed.)
Cooling
Cooler by Design
The PRIME B850M-A 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.
VRM Heatsinks and Thermal Pads
Massive VRM heatsink and essential thermal pads improve heat transfer from the MOSFETs and chokes for better cooling performance.
AIO Pump Header
A dedicated PWM/DC header supports self-contained water-cooling setups.
Multiple Temperature Sources
Each header can dynamically reference three thermal sensors. Fan Xpert 2+ lets you to map the temperature of supported ASUS graphics cards to optimise cooling for GPU- and CPU-intensive tasks.
4-Pin PWM/DC Fan
Each onboard header supports auto-detection of PWM or DC fans.
M.2 Heatsink
One M.2 heatsink takes care of the M.2 slot, preventing throttling that can occur with M.2 storage during extended transfers.
Passive Chipset Heatsink
An aluminium passive chipset heatsink ensures optimal cooling and stable performance. It is more durable and longer-lasting than heatsinks with fans, which can be vulnerable to the buildup of dust and debris.
Smart Protection
A dedicated integrated circuit protects each fan header from overheating and excess current.
Smart Cooling Precision
ASUS Fan Xpert 2+
ASUS Fan Xpert 2+ software provides comprehensive control over fans. An Auto-Tuning mode intelligently configures all parameters with a single click. There’s also an Extreme Quiet mode that reduces chassis fan speeds to below the default minimum to keep your system whisper-quiet when performing light tasks. Fans can also be controlled via the UEFI BIOS.
Cooler Compatibility
ASUS AIO coolers offer robust performance, high overclocking potential, bold aesthetics and customisable functionality for new motherboards, empowering you to build your dream gaming rig.
Flexibility
Empowering Connections
This motherboard offers a versatile range of connectivity, including support for WiFi 6E, PCIe 5.0 slot and an arsenal of USB ports which includes Type-C® connections.
- WiFi 6E
- 2.5Gb Ethernet
- PCIe 5.0
- PCIe 5.0 slot
- USB 5Gbps
WiFi 6E
Built-in WiFi 6E (WiFi 6E availability and features are dependent on regulatory limitations and co-existence with 5 GHz WiFi.) technology takes advantage of the newly available radio spectrum in the 6 GHz band. With triple the bandwidth of the 2.4/5/6 GHz band, WiFi 6E delivers ultrafast wireless networking speeds with improved capacity and better performance in dense wireless environments.
Realtek 2.5Gb Ethernet
Realtek 2.5 Gb Ethernet reduces CPU overhead and offers exceptionally high TCP and UDP throughput for faster, smoother data transfers.
Front USB 5Gbps Type-C®
This motherboard features a USB 5Gbps Type-C® front panel connector for speedy data transfers of up to 5Gbps.
Customisation - Personalisation
The PRIME B850M-A WIFI-CSM enhances the user experience across the board, from simplifying BIOS setting adjustments to offering customisable RGB lighting controls for a uniquely personal system aesthetic.
UEFI BIOS
The UEFI interface delivers easy-to-use configuration options for PC beginners, and advanced features for veterans.
The renowned ASUS UEFI BIOS provides everything you need to configure, tweak and tune your system. It offers intelligently simplified options for PC DIY beginners, as well as comprehensive features for seasoned veterans.
BIOS Q-Dashboard
Simplify your motherboard configuration with BIOS Q-Dashboard. Its intuitive visual representation of hardware connections and corresponding BIOS settings takes the complexity out of setting up your system. Upgrade now, and discover the power of BIOS Q-Dashboard to easily and efficiently enhance your computing setup.
Advanced Mode
An intuitive Advanced mode offered via the UEFI lets you take complete control. A built-in search feature makes it easy to find options, and various advanced functions let you intelligently make nuanced adjustments so you can dial in performance just the way you want.
ASUS MyHotkey
This feature is flexible to Customise BIOS hotkey for various use scenarios, users can set F3 and F4 optional functions, and then during the Power-On Self-Test (POST) you can more efficiently toggle ASUS EZ Flash 3 or boot from a specified device.
Search Function
Quickly and easily find the option or setting you need.
ASUS User Profile
Easily port configuration settings between different BIOS versions or share them with friends.
EZ Mode
EZ mode displays vital settings and stats and also offers guided wizards, drag-and-drop functionality and one-click application of important settings — all to help you get your rig up and running in no time.
Intuitive Graphical Fan Control
Fine-tune individual fan settings simply by dragging a curve with the mouse.
Aura On/Off Mode (Stealth)
Easily enable or disable Aura RGB lighting or every onboard LED, for a subdued aesthetic touch.
ASUS GlideX
Enable seamless screen sharing and control across PCs, tablets, and smartphones via wired or wireless connections, supporting multiple platforms.
ASUS GlideX is a cross-device, cross-platform screen-sharing, screen-control and operation solution for enhanced productivity across PCs, tablets, and smartphones via wired or wireless connections. Features include screen mirroring, screen extension, unified control with one keyboard and mouse, easy file transfers, and using mobile cameras as PC webcams. It's compatible with Windows, macOS, Android, and iOS.
ASUS DriverHub
Simplify driver management with automatic detection, one-click installation and update for smooth, efficient system performance.
ASUS DriverHub streamlines the installation and management of ASUS drivers and utilities to keep your hardware up-to-date and performing optimally. This standalone application automatically detects current driver versions and presents available updates in a list view. By default, it supports ASUS motherboards, and users are invited to install ASUS DriverHub after OS installation. Additionally, ASUS DriverHub offers one-click installation and update checks, making it easier for users to keep their systems running smoothly and efficiently.
Armoury Crate
Customise Aura Sync RGB and control ASUS devices. Includes product registration and updates.
Within a single intuitive interface, Armoury Crate offers easily Customised Aura Sync RGB settings for every compatible device in your arsenal, plus controls for an ever-growing family of ASUS products, including keyboard and mouse preferences. Armoury Crate also integrates product registration and a news feed so that the ASUS community always has access to interesting updates.
- Dashboard
- Aura Sync
- Fan Xpert 2+
- Power Saving
- Driver & Manual Download
- Account Management
Aura Sync
Complete RGB lighting control for enthusiast systems, ensuring seamless synchronisation with compatible hardware.
Outshine the Competition
A well-tuned enthusiast system deserves a matching aesthetic. ASUS Aura offers full RGB lighting control with a variety of functional presets for the built-in RGB LEDs as well as strips and devices connected to the onboard RGB headers — and it can all be synced with an ever-growing portfolio of Aura-capable hardware.
- Static
- Breathing
- Strobing
- Rainbow
- Colour Cycle
- Starry Night
- Music Effect
- Smart
- Dark
- Adaptive Colour
Addressable Gen2 RGB Headers
Three addressable Gen 2 headers detect LED counts on compatible RGB devices, automatically adjusting lighting effects accordingly.
Customisation - DIY Friendly
The PRIME B850M-A WIFI-CSM motherboard features EZ PC DIY innovations that simplify and speed up the PC building process, making DIY easy and convenient.
Q-Antenna
With Q-Antenna, attaching a WiFi antenna to your PC is now easy and fast. Instead of slowly rotating two fasteners until they finally lock in, they just snap into place. Less hassle, and more consistent performance.
Q-LED Core
The Q-LED Core display produces colour-coded lights during the Power-On Self-Test (POST) that can help you troubleshoot potential issues.
- No CPU detected - fast blinking 4 Hz (0.25 s)
- No VGA detected - slow blinking 1/2 Hz (2 s)
- No boot device detected - very slow blinking 1/8 Hz (8 s)
- Installation completed - solid light
Pre-Mounted I/O Shield
Our pre-installed I/O shield safeguards ports, simplifies the build process, increases functionality and enhances aesthetics for PC DIY enthusiasts.
BIOS FlashBack™
BIOS FlashBack™ simplifies BIOS updates. Just load the BIOS file onto a FAT32 USB stick, insert it into the BIOS FlashBack™ port, and press a button—no CPU or memory needed.
SafeSlot
PCIe 5.0 is twice as fast as PCIe 4.0. ASUS has adapted our SMT manufacturing for the faster SafeSlot, a reinforced metal sheath that ensures secure card installation and faster data speeds.
Build for the Most Advanced PC for Gaming and Creating
When only the fastest will do, ASUS motherboards deliver. With faster dual-channel DDR5 memory support, AMD EXPO™ technology and PCIe® 5.0 support for both graphics and NVMe, you can play the most demanding games and deliver your biggest projects with the revolutionary performance of an ASUS motherboard and AMD Ryzen™ 9000, 8000, and 7000 Series processors.
Backed by a 3 year Asus warranty.
