ASUS PRIME B850M-A-CSM AMD B850 Socket AM5 micro ATX

ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen™ 9000 series processors. The PRIME B850M-A-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 Corporate Stable Mod

Current market EU-wide All EU markets
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Best price €189.95
Highest price €223.00
Offers 4
Specifications 74
Processor socket
Socket AM5
Compatible processor series
AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series
Supported storage drive interfaces
PCI Express 4.0, PCI Express 5.0
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity
2
Supported processor sockets
Socket AM5
Maximum resolution
7680 x 4320 pixels
Lowest verified offer €189.95 LDLC from LU
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Bluechip Hungary
€223.00 Store price: Ft 80,900
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€5.39 Original price: Ft 1,955
Aug 13, 2026, 5:04 PM
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Overview

ASUS PRIME B850M-A-CSM AMD B850 Socket AM5 micro ATX price comparison

ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen™ 9000 series processors. The PRIME B850M-A-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 Corporate Stable ModelASUS Corporate Stable Model (CSM) is a commercial program designed to provide stable and reliable motherboards. Offering up to 36-month product lifecycle support and 6-month end-of-life notice to allow sufficient lead times for your organization to get ready for product transitions. Each purchase of an ASUS CSM motherboard comes with ASUS Control Center Express - server-grade IT management software.ASUS Control Center ExpressASUS 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 managementDesigned to assist IT staff in monitoring and controlling devices within their corporate networks, and facilitate inventory checking in multiple locations remotely.Automate IT maintenanceAllows 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 endpointsSecurely manage endpoint configuration, portable storage access and PC software applications by enabling them to create grouping rules on individual devices.PerformanceAI SolutionsASUS AI Solutions include AI Advisor as your technical expert with expertise in PC performance.AI AdvisorASUS AI Advisor allows users to explore the functionality and advanced features of ASUS motherboards in a simple and straightforward way.PerformanceDigital Power DesignPRIME B850M-A-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.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.The Digi+ voltage-regulator module (VRM) delivers real-time control over voltage droop, automatically switching frequency and power-efficiency settings.Enhanced Memory & Storage PerformanceEnhanced DDR5 performanceComprehensive memory tuning options are the cornerstone of PRIME motherboards. The PRIME B850M-A-CSM maximizes the potential of your DDR5 modules, from entry-level to extreme-speed kits.2For 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 B850M-A-CSM offers extensive AMD Extended Profiles for Overclocking (EXPO™) support and a wide array of UEFI settings for further performance tweaks.Three M.2 slots (up to 128 Gbps)PRIME B850M-A-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.CoolingCooler by designThe PRIME B850M-A-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.Smart Cooling precisionASUS 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 compatibilityASUS AIO coolers offer robust performance, high overclocking potential, bold aesthetics and customizable functionality for new motherboards, empowering you to build your dream gaming rig.FlexibilityEmpowering connectionsThis motherboard offers a versatile range of connectivity, including support for PCIe 5.0 slot and an arsenal of USB ports which includes Type-C® connections.Realtek 2.5 Gb EthernetRealtek 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.CustomizationPersonalizationThe PRIME B850M-A-CSM 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 BIOSThe UEFI interface delivers easy-to-use configuration options for PC beginners, and advanced features for veterans.ASUS DriverHubSimplify driver management with automatic detection, one-click installation and update for smooth, efficient system performance.Armoury CrateCustomize Aura Sync RGB and control ASUS devices. Includes product registration and updates.Aura SyncComplete RGB lighting control for enthusiast systems, ensuring seamless synchronization with compatible hardware.Addressable Gen 2 RGB headersThree addressable Gen 2 headers detect LED counts on compatible RGB devices, automatically adjusting lighting effects accordingly.CustomizationDIY friendlyThe PRIME B850M-A-CSM motherboard features EZ PC DIY innovations that simplify and speed up the PC building process, making DIY easy and convenient.Pre-mounted I/O shieldOur 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.SafeSlotPCIe 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.Q-LED CoreThe Q-LED Core display produces color-coded lights during the Power-On Self-Test (POST) that can help you troubleshoot potential issues.Build for the most advanced pc for gaming and creatingWhen 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.

Normalized specifications on this page: 74. Visible facts include: Memory: 256 GB, Weight: 1.45 kg.

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Match the exact product using: GTIN 4711636054706, MPN 90MB1LQ0-M0EAYC.

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Normalized specifications on this page: 74. Visible facts include: Memory: 256 GB, Weight: 1.45 kg.

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FAQ

Questions about ASUS PRIME B850M-A-CSM AMD B850 Socket AM5 micro ATX

Which exact product is ASUS PRIME B850M-A-CSM AMD B850 Socket AM5 micro ATX?

Match the exact product using: GTIN 4711636054706, MPN 90MB1LQ0-M0EAYC.

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Normalized specifications on this page: 74. Visible facts include: Memory: 256 GB, Weight: 1.45 kg.

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Specifications

Technical data

74 specs

BIOS

BIOS type
UEFI AMI
BIOS memory size
256 Mbit

Design

Product colour
Grey
Cooling type
Passive

Expansion slots

PCI Express x16 (Gen 4.x) slots
2
1st M.2 largest key size
2280
1st M.2 highest PCI Express generation
5
2nd M.2 largest key size
2280
2nd M.2 highest PCI Express generation
4
3rd M.2 largest key size
2280
3rd M.2 highest PCI Express generation
4
4th M.2 largest key size
2280
4th M.2 highest PCI Express generation
4

Features

Motherboard chipset
AMD B850
Audio output channels
7.1 channels
Component for
PC
Motherboard form factor
micro ATX
Motherboard chipset family
AMD

Graphics

Parallel processing technology support
Not supported

Internal I/O

USB 2.0 connectors
2
Number of SATA III connectors
4
S/PDIF out connector
Yes
Front panel audio connector
Yes
Front panel connector
Yes
ATX Power connector (24-pin)
Yes
Number of COM connectors
Yes
CPU fan connector
Yes
Chassis intrusion connector
Yes
TPM connector
Yes
12V power connector
Yes
RGB LED pin header
Yes
Number of RGB LED pin headers
3

Memory

Supported memory types
DDR5-SDRAM
Number of memory slots
4
Memory slots type
DIMM
Memory channels
Dual-channel
ECC сompatibility
ECC & Non-ECC
Supported memory clock speed (max)
8000 MHz
Maximum internal memory
256 GB
Unbuffered memory
Yes
Maximum internal memory per slot
64 GB

Network

Ethernet LAN
Yes
Wi-Fi
No
Ethernet interface type
2.5 Gigabit Ethernet
Top Wi-Fi standard
Not available

Packaging content

Screws included
Yes
Cables included
SATA

Ports & interfaces

USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity
2
HDMI version
2.1
Microphone in
Yes
EPS power connector (8-pin)
Yes
USB 2.0 ports quantity
4
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity
2
DisplayPort version
1.4

Power

Power source type
ATX

Printing

Maximum resolution
7680 x 4320 pixels

Processor

Processor socket
Socket AM5
Compatible processor series
AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series
Supported processor sockets
Socket AM5
Processor manufacturer
AMD

Rear panel I/O ports

Line-in
Yes

Software

Windows operating systems supported
Windows 10 x64, Windows 11

Storage

Supported storage drive interfaces
PCI Express 4.0, PCI Express 5.0
RAID support
Yes
RAID levels
0, 1, 5, 10
Number of storage drives supported
7
Supported storage drive types
HDD & SSD

Storage controllers

Number of HDDs supported
4

Weight & dimensions

Width
244 mm
Depth
244 mm
Package width
275 mm
Package depth
275 mm
Package height
67.5 mm
Package weight
1.45 kg

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