ASUS PRIME B850-PLUS WIFI-CSM AMD AM5 ATX Motherboard | Ryzen 9000/8000/7000 | 256GB DDR5 | 8000+MT/s (OC) | Wi-Fi 6E | 2.5Gb LAN | 3× M.2 | PCIe 5.0

The ASUS PRIME B850-PLUS WIFI-CSM is an AMD B850 ATX motherboard designed for modern Ryzen desktop systems, productivity, gaming, content creation, and PC DIY builds. Supporting AMD Ryzen 9000, 8000, and 7000 Series Desktop Processors on the Socket AM5 platform, it provides a flexible foundation for performance-focused desktop configurations.

With 4 DDR5 DIMM slots supporting up to 256GB, memory speeds of up to 8000+MT/s (OC), PCIe 5.0 expansion, three M.2 slots, four SATA 6Gb/s ports, 2.5Gb Ethernet, and Wi-Fi 6E, the motherboard provides extensive connectivity and expansion options.

The PRIME B850-PLUS WIFI-CSM also incorporates ASUS technologies, including 5X Protection III, Q-Design, ASUS Thermal Solution, EZ DIY, Aura Sync, and comprehensive BIOS and software tools for easier system configuration and management.

Key Features

AMD AM5 Platform

The motherboard supports:

• AMD Ryzen 9000 Series Desktop Processors
• AMD Ryzen 8000 Series Desktop Processors
• AMD Ryzen 7000 Series Desktop Processors
• AMD Socket AM5
• Up to 170W CPU support
• AMD B850 Chipset

This provides a modern platform for high-performance AMD desktop systems.

DDR5 Memory Support

Four DIMM slots provide flexible memory expansion with support for:

• Up to 256GB DDR5
• Up to 8000+ MT/s (OC) with supported Ryzen processors
• ECC and non-ECC unbuffered DIMMs
• Dual-channel memory architecture
• AMD EXPO technology
• ASUS Enhanced Memory Profile (AEMP)

Non-ECC unbuffered DDR5 memory supports on-die ECC functionality.

PCIe 5.0 Expansion

With supported Ryzen 9000 and 7000 Series processors, the primary PCIe slot supports PCIe 5.0 x16 mode, providing high-bandwidth expansion for compatible graphics cards and other devices.

Additional expansion is provided through PCIe 4.0 and PCIe 3.0 slots.

Three M.2 Slots

The motherboard supports 3× M.2 slots for modern NVMe storage.

With compatible Ryzen 9000 and 7000 Series processors:

• M.2_1: PCIe 5.0 x4
• M.2_2: PCIe 4.0 x4

The chipset provides:

• M.2_3: PCIe 4.0 x2

Four SATA 6Gb/s ports provide additional storage connectivity.

2.5 Gb Ethernet

Integrated Realtek 2.5Gb Ethernet provides high-speed wired networking for gaming, large file transfers, productivity, and high-bandwidth network environments.

ASUS LANGuard provides additional protection for the network connection.

Wi-Fi 6E & Bluetooth 5.3

Built-in wireless connectivity includes:

• Wi-Fi 6E
• 2×2 802.11ax
• 2.4 GHz, 5 GHz, and 6 GHz bands
• Bluetooth 5.3

Wi-Fi 6E 6GHz functionality requires compatible regional regulations and is supported only with Windows 11 or later.

Comprehensive USB Connectivity

The rear I/O provides 8 USB ports, including:

• 3× USB 10 Gbps Type-A
• 1× USB 10 Gbps Type-C
• 2× USB 5Gbps Type-A
• 2× USB 2.0 Type-A

Internal headers provide additional USB expansion for front-panel and chassis connectivity.

HDMI & DisplayPort

The motherboard provides integrated graphics outputs for compatible Ryzen processors:

• 1× DisplayPort 1.4
• 1× HDMI 2.1

DisplayPort supports up to 8K @ 30Hz, while HDMI supports up to 4K @ 60Hz, subject to processor graphics capabilities.

7.1 Surround Sound

The motherboard features a Realtek 7.1-channel High Definition Audio CODEC supporting up to 24-bit/192kHz playback.

Audio enhancements include:

• Audio shielding
• Premium audio capacitors
• Dedicated audio PCB layers
• Jack detection
• Multi-streaming
• Front-panel jack retasking

Technical Specifications

Specification	Details
Brand	ASUS
Series	PRIME
Model	PRIME B850-PLUS WIFI-CSM
Product Type	Motherboard
Form Factor	ATX
Dimensions	30.5 × 24.4 cm
CPU Socket	AMD Socket AM5
Supported CPUs	AMD Ryzen 9000 / 8000 / 7000 Series
Maximum CPU Support	Up to 170W
Chipset	AMD B850
Memory Type	DDR5
DIMM Slots	4
Maximum Memory	256GB
Memory Speed	Up to 8000+ MT/s (OC)
Memory Architecture	Dual Channel
Memory Support	ECC/Non-ECC Unbuffered DIMM
PCIe	PCIe 5.0 / PCIe 4.0 / PCIe 3.0
M.2 Slots	3
SATA Ports	4× SATA 6 Gb/s
Ethernet	Realtek 2.5 Gb Ethernet
Wireless	Wi-Fi 6E 2×2
Bluetooth	5.3
HDMI	1× HDMI 2.1
DisplayPort	1× DisplayPort 1.4
Rear USB	8 ports
Audio	Realtek 7.1 Surround Sound HD Audio
BIOS	256 MB Flash ROM, UEFI AMI BIOS
Operating System	Windows 11 / Windows 10 64-bit

Expansion Slots

AMD Ryzen 9000 & 7000 Series Processors

• 1× PCIe 5.0 x16
  • Supports x16 mode

AMD Ryzen 8000 Series Processors

• 1× PCIe 4.0 x16
  • Supports x8/x4 mode depending on CPU

AMD B850 Chipset

• 1× PCIe 4.0 x16
  • Supports x4 mode
• 2× PCIe 3.0 x16
  • Supports x1 mode

Slot functionality and bandwidth may vary according to processor configuration.

Storage

The motherboard provides three M.2 slots and four SATA 6Gb/s ports.

M.2

AMD Ryzen 9000 / 7000 Series

• M.2_1: Key M, 2280, PCIe 5.0 x4
• M.2_2: Key M, 2280, PCIe 4.0 x4

AMD Ryzen 8000 Series

• M.2_1: Key M, 2280, PCIe 4.0 x4
• M.2_2: Key M, 2280, PCIe 4.0 x4/x2

AMD B850 Chipset

• M.2_3: Key M
• Supports 2242 / 2260 / 2280 / 22110
• PCIe 4.0 x2

SATA

• 4× SATA 6 Gb/s

AMD RAIDXpert2

Supported RAID configurations vary by processor:

• Ryzen 9000: RAID 0/1/5/10
• Ryzen 8000: RAID 0/1
• Ryzen 7000: RAID 0/1/10

Networking

Wired Ethernet

• Realtek 2.5 Gb Ethernet
• ASUS LANGuard

Wireless

• Wi-Fi 6E
• 2×2 802.11ax
• 2.4 GHz / 5 GHz / 6 GHz

Bluetooth

• Bluetooth 5.3

Rear I/O

The rear panel provides:

• 1× USB 10 Gbps Type-C
• 3× USB 10 Gbps Type-A
• 2× USB 5Gbps Type-A
• 2× USB 2.0 Type-A
• 1× DisplayPort
• 1× HDMI
• 1× Wi-Fi module connection
• 1× Realtek 2.5 Gb Ethernet
• 3× Audio jacks
• 1× BIOS FlashBack button

Internal I/O Connectors

Fan & Cooling

• 1× 4-pin CPU fan header
• 1× 4-pin CPU OPT Fan header
• 1× 4-pin AIO Pump header
• 4× 4-pin Chassis Fan headers

Power

• 1× 24-pin Main Power connector
• 1× 8-pin +12V CPU power connector
• 1× 4-pin +12V CPU power connector

Storage

• 3× M.2 slots
• 4× SATA 6Gb/s ports

USB

• 1× USB 5Gbps Type-C connector
• 1× USB 5Gbps header supporting 2 additional USB 5Gbps ports
• 3× USB 2.0 headers supporting 6 additional USB 2.0 ports

Other Connectors

• 3× Addressable RGB Gen 2 headers
• 1× Clear CMOS header
• 1× Chassis Intrusion header
• 1× COM Port header
• 1× Front Panel Audio header
• 1× S/PDIF Out header
• 1× SPI TPM header
• 1× System Panel header
• 1× Thunderbolt / USB4 header

ASUS 5X Protection III

The motherboard incorporates ASUS 5X Protection III, including:

• DIGI+ VRM
• LANGuard
• Overvoltage Protection
• SafeSlot
• Stainless-Steel Back I/O

These features are designed to provide additional protection and durability for the system.

ASUS Q-Design

ASUS Q-Design technologies simplify system building and configuration.

Features include:

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

ASUS Thermal Solution

The motherboard includes thermal-focused design features such as

• Flexible M.2 heatsink
• VRM heatsink design

These help provide appropriate thermal management for the motherboard's key components.

ASUS EZ DIY

Convenience features include:

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

Aura Sync & RGB

The motherboard supports ASUS Aura Sync and provides:

• Addressable RGB Gen 2 headers
• Aura Creator
• Aura Sync lighting control

This allows compatible RGB components to be synchronized through the ASUS ecosystem.

Software Features

ASUS Exclusive Software

• Armoury Crate
• Aura Creator
• Aura Sync
• Fan Xpert 2+
• Power Saving
• ASUS AI Advisor
• ASUS Driver Hub
• ASUS GlideX
• TurboV Core
• ASUS CPU-Z
• Norton 360 Deluxe – 60-day free trial
• WinRAR – 40-day free trial

UEFI BIOS

The motherboard includes a 256 MB Flash ROM with UEFI AMI BIOS and supports:

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

Remote Management & Manageability

For supported business and IT environments, the motherboard provides:

• ASUS Control Center Express (ACCE) support
• Wake-on-LAN by PME
• PXE support

These features make the platform suitable for managed desktop environments as well as conventional DIY systems.

Accessories

The package includes:

• 2× SATA 6Gb/s cables
• ASUS WiFi Q-Antenna
• M.2 rubber packages
• 3× M.2 SSD screw packages
• ACC Express Activation Key Card
• Quick Start Guide

Operating System Support

Supported operating systems include:

• Windows 11
• Windows 10 64-bit

Ideal For

The ASUS PRIME B850-PLUS WIFI-CSM is suitable for:

• AMD Ryzen gaming PCs
• High-performance desktop builds
• Gaming systems
• Productivity workstations
• Content creation PCs
• AI-ready PC builds
• Professional workstations
• PC DIY enthusiasts
• Custom ATX builds
• Multi-storage systems
• High-speed networking setups
• Wi-Fi 6E desktop systems

Why Choose ASUS PRIME B850-PLUS WIFI-CSM?

The ASUS PRIME B850-PLUS WIFI-CSM provides a feature-rich AM5 platform for users building a modern AMD desktop system. Its combination of Ryzen 9000/8000/7000 processor support, 256GB DDR5 capacity, 8000+MT/s (OC) memory support, PCIe 5.0, three M.2 slots, 2.5Gb Ethernet, Wi-Fi 6E, Bluetooth 5.3, and extensive USB connectivity makes it a versatile foundation for gaming, productivity, and professional PC builds.

The ATX form factor, comprehensive cooling headers, integrated wireless connectivity, advanced ASUS protection features, and EZ DIY technologies further simplify the process of building and managing a modern desktop system.

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