PRIME B840-PLUS WIFI
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PRIME B840-PLUS WIFI motherboard front view, floating in space.

B840-PLUS WIFI

ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen™ 9000 series processors. The PRIME B840-PLUS WIFI 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.
* CEC Tier II ready
Advanced AI PC ready logo
AMD Ryzen logo
AMD B840 platform logo
Logo depicting power stages

8+2+1

phase digital power design
DDR5 logo

AEMP

for enhanced DDR5 performance
2.5Gb Ethernet icon

2.5Gb Ethernet

for faster data transfers
WiFi 6E icon

WiFi 6E

for stable WiFi connection and lower latency
USB 10Gbps Type-C icon

USB 10Gbps Type-C®

for rapid data transmission
PCIe 4.0 slots icon

PCIe 4.0 slots

for graphics card and storage
EZ PC DIY icon

EZ PC DIY

for easier build customization
Pre-mounted I/O shield icon

Pre-mounted
I/O shield

for safeguarding ports and enhancing aesthetics
Aura Sync icon

Aura Sync

for full RGB lighting control

Performance

AI Solutions

ASUS AI Solutions include AI Cache Boost to supercharge large language model (LLM) workflows, ASUS AI Advisor as your technical expert with expertise in PC performance.

AI Cache Boost

Supercharge your large language model (LLM) workflows with AI Cache Boost. Exclusive to ASUS AMD 800 and 600 series motherboards that use Ryzen™ 9000 Series CPUs, this BIOS setting optimizes CPU cache and memory pathways to deliver up to 29% faster local LLM performance with high-speed memory tuning.

ASUS AI Solutions webpage section highlighting AI Cache Boost. Shows comparison of AI Cache Boost On versus Off, with up to 29% faster local LLM performance using optimized DRAM and FCLK tuning. Blue background with product performance description and a 'Learn More' button.

AI Advisor

ASUS AI Advisor allows users to explore the functionality and advanced features of ASUS motherboards in a simple and straightforward way.7

UI showing that AI Advisor can be interacted using natural language.

Performance

Digital Power Design

PRIME B840-PLUS WIFI 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
Angled top-down view of PRIME B840-PLUS WIFI motherboard.

Enhanced Memory & Storage Performance

Enhanced DDR5 performance

Comprehensive memory tuning options are the cornerstone of PRIME motherboards. The PRIME B840-PLUS WIFI maximizes the potential of your DDR5 modules, from entry-level to extreme-speed kits.1
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 offers extensive AMD Extended Profiles for Overclocking (EXPO™) support and a wide array of UEFI settings for further performance tweaks.2
Graphic depicting RAM speeds.

Three M.2 slots (up to 64 Gbps)

PRIME B840-PLUS WIFI 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.3
Graphic depicting different M.2 slots on a motherboard.

Cooling

Cooler by design

The PRIME B840-PLUS WIFI 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.
PRIME B840-PLUS WIFI front view.

VRM heatsinks and thermal pads

Two massive VRM heatsinks and essential thermal pads improve heat transfer from the MOSFETs and chokes for better cooling performance.

4-Pin PWM/DC fan

Each onboard header supports auto-detection of PWM or DC fans.

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 optimize cooling for GPU- and CPU-intensive tasks.

M.2 heatsink

One Flexible M.2 heatsink that can take care of either of the two M.2 slots, preventing throttling that can occur with M.2 storage during extended transfers.

Passive chipset heatsink

An aluminum 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.
UI for Fan Xpert 2+

Cooler compatibility

ASUS AIO coolers offer robust performance, high overclocking potential, bold aesthetics and customizable functionality for new motherboards, empowering you to build your dream gaming rig.5
See compatible AIO coolers
A Prime motherboard and AIO cooler on a table.

Flexibility

Empowering connections

This motherboard offers a versatile range of connectivity, including support for WiFi 6E, PCIe 4.0 slot and an arsenal of USB ports which includes Type-C® connections.
WiFi 6E logo

WiFi 6E

Realtek 2.5Gb Ethernet logo

2.5Gb Ethernet

PCIe 4.0 logo

PCIe 4.0

PCIe 4.0 slot logo

PCIe 4.0 slot

USB 10Gbps logo

USB 10Gbps

WiFi 6E

Built-in WiFi 6E4 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.
Learn More
ASUS WiFi Q-Antenna

Realtek 2.5 Gb Ethernet

Realtek 2.5 Gb Ethernet reduces CPU overhead and offers exceptionally high TCP and UDP throughput for faster, smoother data transfers.
Realtek 2.5 Gb Ethernet

USB 10Gbps Type-C®

A batch of USB ports support high-end rigs loaded with peripherals, including a rear USB Type-C® connector with ultrafast USB 10Gbps for transmission speeds of up to 10Gbps.
USB 10Gbps Type-C®

Customization

Personalization

The PRIME B840-PLUS WIFI enhances the user experience across the board, from simplifying BIOS setting adjustments to offering customizable 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.

UEFI BIOS advanced mode UI.

ASUS GlideX

Enable seamless screen sharing and control across PCs, tablets, and smartphones via wired or wireless connections, supporting multiple platforms.

GlideX Logo

ASUS DriverHub

Simplify driver management with automatic detection, one-click installation and update for smooth, efficient system performance.

ASUS DriverHub UI

Armoury Crate

Customize Aura Sync RGB and control ASUS devices. Includes product registration and updates.

ASUS Armoury Crate UI

Aura Sync

Complete RGB lighting control for enthusiast systems, ensuring seamless synchronization with compatible hardware.

ASUS Aura Sync Logo

Addressable Gen 2 RGB headers

Three addressable Gen 2 headers detect LED counts on compatible RGB devices, automatically adjusting lighting effects accordingly.

Image depicting PRIME B840-PLUS WIFI ARGB connectors.

Customization

DIY friendly

The PRIME B840-PLUS WIFI motherboard features EZ PC DIY innovations that simplify and speed up the PC building process, making DIY easy and convenient.

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.

Graphic depicting the PRIME B840-PLUS WIFI pre-mounted I/O Shield.

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.

Graphic depicting the PRIME B840-PLUS WIFI BIOS FlashBack feature.

SafeSlot Core+

SafeSlot Core+ is a one-piece stainless-steel brace that shields the slot to protect it from damage. The metal cover is tightly secured to the slot with hooks, and the entire assembly is firmly anchored to the PCB with strengthened solder points to provide a secure foundation for heavyweight graphics cards.

Graphic depicting the PRIME B840-PLUS WIFI SafeSlot Core+ feature.
AMD Ryzen 9000 Series CPU

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® 4.0 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.
  1. © 2024 Advanced Micro Devices, Inc. All rights reserved. AMD, the AMD Arrow logo, Radeon, Ryzen and combinations thereof are trademarks of Advanced Micro Devices, Inc. Other product names used in this publication are for identification purposes only and may be trademarks of their respective owners.
  1. Memory overclocking may vary between CPU series. Please refer to the spec table for detailed information.↑
  2. 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/.↑
  3. Actual transmission speeds will be lower than the theoretical maximum speed.↑
  4. WiFi 6E availability and features are dependent on regulatory limitations and co-existence with 5 GHz WiFi.↑
  5. Image(s) for reference only.↑
  6. Video(s) for reference only.↑
  7. Availability of ASUS AI Advisor may vary by region.
    AI Advisor functions may vary by platform. ↑
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Product has High-Definition Multimedia Interface.
  • Este producto cuenta con certificación conforme a las Normas Oficiales Mexicanas (NOM), emitida por un organismo de certificación acreditado  (NYCE), y con la homologación requerida por la autoridad de telecomunicaciones competente en México (actualmente el Instituto Federal de Telecomunicaciones – IFT, o la entidad que en el futuro lo sustituya).
  • Todas las especificaciones están sujetas a cambios sin previo aviso. Por favor, consulte con su proveedor o distribuidor autorizado para obtener información exacta sobre disponibilidad, versiones y precios. 
  • Los productos pueden no estar disponibles en todos los mercados. Las especificaciones y características varían según el modelo, y todas las imágenes son ilustrativas. Consulte las páginas de especificaciones para obtener todos los detalles. El color del PCB y las versiones de software incluidas están sujetos a cambios sin previo aviso.
  • Los nombres de marcas y productos mencionados son marcas comerciales de sus respectivas compañías. A menos que se indique lo contrario, todas las declaraciones de rendimiento se basan en el rendimiento teórico. Las cifras reales pueden variar en situaciones del mundo real. La velocidad de transferencia real de USB 3.0, 3.1, 3.2 y/o Tipo-C variará dependiendo de muchos factores, incluida la velocidad de procesamiento del dispositivo host, los atributos de los archivos y otros factores relacionados con la configuración del sistema y su entorno operativo.
  • Los términos HDMI y HDMI High-Definition Multimedia Interface, HDMI trade dress y el logotipo de HDMI son marcas comerciales o marcas comerciales registradas de HDMI Licensing Administrator, Inc. en los Estados Unidos y otros países.
  • Las especificaciones y características varían según el modelo, y todas las imágenes son ilustrativas. Consulte las páginas de especificaciones para obtener detalles completos.
  • * Las especificaciones y características precisas varían según el modelo. Consulte la página de especificaciones
  • El producto (equipo eléctrico, electrónico, batería de botón que contiene mercurio) no debe tirarse a la basura municipal. Consulte las normativas locales para la eliminación de productos electrónicos.
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  • Obtenga más información sobre el uso, la extracción, el reemplazo y las pautas de seguridad relacionadas con la batería

**Las especificaciones del producto y el diseño de la batería pueden variar según el modelo. Para cualquier pregunta, comuníquese con el servicio de atención al cliente oficial de ASUS.