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Asus PRIME B840M-A-CSM Motherboard Micro ATX with AMD AM5 Socket
Motherboards

Asus PRIME B840M-A-CSM Motherboard Micro ATX with AMD AM5 Socket

Key features:

  • 4 DDR5 Ram slots up to 7600(OC)
  • Ryzen 9000/8000/7000 processors
  • Slots for 4x Sata III and 3x M.2
See full description

  • Socket

    The processor socket type.

    The processor we choose should have the same socket in order to fit into the motherboard.

    In addition to the socket, the motherboard chipset must also be supported by the processor.

  • Size

    The size of the motherboard is expressed with a code name (standard).
    2. We make sure that the computer case in which the motherboard will be installed supports the corresponding standard in order to fit it.

    Micro ATX

    Smaller than ATX, with fewer slots but sufficient for everyday use.

  • Usage

    Desktop

    Motherboards designed for use in desktop computers.

  • Chipset

    The motherboard chip that manages connections with motherboard components (e.g. CPU, RAM memory, hard disk, USB ports).

    The processor we choose must support the motherboard chipset in order to be 100% compatible with each other and to fully utilize the motherboard connections.

    If the motherboard chipset is supported by the processor, then the socket will also be compatible.

     

  • Memory

    Memory Type and RAM Slots

    Indicates the type of RAM memory supported by the motherboard (e.g., DDR4, DDR5) and the number of slots (DIMM slots) for the modules, which determines how much memory can be installed in total.
  • See all
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Product report

Description

Description

Type: ATX UEFI Mobile Cover

Features:

  • USB Memory
  • Installation guide included
  • Color: Gray
  • Form factor: MicroATX
  • Interface: Gigabit Ethernet
  • Memory: 256 MB
  • Number of memory slots: 4
  • Speakers: 7.1
  • Connections: HDMI x 1, 2 x USB 2.0, USB 2.0 x 4, Ethernet LAN, SATA x 4, M.2 x 3, HDMI 2.1 x 1, DIMM, 2 x USB 3.2 Gen 2 (3.1 Gen 2), PCI Express x16 2.0, DisplayPort x 1, RJ45 x 1
  • Compatible: HDD/SSD PC
  • Includes: SATA screws
  • Does not include: WiFi
  • Chipset: AMD
  • Power Supply: ATX
  • Socket: AMD AM5
  • Memory Type: DDR5
  • Processor family: AMD

AI Advisor

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

Digital Power Design

The PRIME B840M-A-CSM features an 8+2+1 phase power design with discrete MOSFETs, ensuring efficient and stable power delivery for AMD processors and consistent performance for everyday use.

Enhanced DDR5 Performance

Comprehensive memory tuning options are the cornerstone of PRIME motherboards. The PRIME B840M-A-CSM maximizes the capabilities of DDR5 modules, from entry-level to extreme speed kits.
For entry-level modules without EXPO™ support, the ASUS Enhanced Memory Profile (AEMP) automatically detects memory chips and provides optimized profiles for improved performance. For those looking to surpass standard DDR5 speeds, the PRIME B840M-A offers extensive support for AMD Extended Profiles for Overclocking (EXPO™) and a wide range of UEFI settings for further performance enhancements.

Three M.2 slots (up to 64 Gbps)

The PRIME B840M-A-CSM offers a total of three M.2 slots, two of which support data transfer speeds of up to 64 Gbps via PCIe 4.0, and one supports PCIe 3.0. This allows for faster boot and application load times with operating system or application drives.

ASUS Fan Xpert 2+

The ASUS Fan Xpert 2+ software provides comprehensive control of the fans. An auto-tuning function intelligently adjusts all parameters with a single click. There is also an Extreme Quiet mode that reduces the chassis fan speeds below the default minimum limit, so your system remains quiet during light tasks. The fans can also be controlled via the UEFI BIOS.

Cooler Compatibility

ASUS AIO coolers offer powerful performance, high overclocking capabilities, bold aesthetics, and customizable features for new motherboards, giving you the ability to create the gaming machine of your dreams.

Realtek 2.5 Gb Ethernet

The Realtek 2.5 Gb Ethernet reduces CPU load and offers ultra-high TCP and UDP performance for faster and smoother data transfers.

Front USB 5Gbps Type-C®

This motherboard features a USB 5Gbps Type-C® front panel connector for ultra-fast data transfers up to 5Gbps.

Pre-installed I/O shield

The pre-installed I/O shield protects the ports, simplifies the building process, enhances functionality, and improves aesthetics for PC DIY enthusiasts.

BIOS FlashBack™

BIOS FlashBack™ simplifies BIOS updates. Simply load the BIOS file onto a FAT32 USB stick, insert it into the BIOS FlashBack™ port, and press a button - no CPU or memory required.

Manufacturer

Manufacturer Details

Warnings & Safety Information
See full description

Specifications

Specifications

Product Details

Size
Micro ATX

Size

The size of the motherboard is expressed with a code name (standard).
2. We make sure that the computer case in which the motherboard will be installed supports the corresponding standard in order to fit it.

Micro ATX
Smaller than ATX, with fewer slots but sufficient for everyday use.
Type
Desktop

Type

Desktop

Motherboards designed for use in desktop computers.

Processor

Supported Processors
AMD
Models
Ryzen
Supported CPU Generation
Zen 4, Zen 5
Socket
AM5

Socket

The processor socket type.

The processor we choose should have the same socket in order to fit into the motherboard.

In addition to the socket, the motherboard chipset must also be supported by the processor.

Chipset

Model
AMD B840

Model

The motherboard chip that manages connections with motherboard components (e.g. CPU, RAM memory, hard disk, USB ports).

The processor we choose must support the motherboard chipset in order to be 100% compatible with each other and to fully utilize the motherboard connections.

If the motherboard chipset is supported by the processor, then the socket will also be compatible.

 

Memory

Memory type
DDR5

Memory type

The type of RAM memory that is compatible with the motherboard.

DDR5

The latest memory type, with speed starting from 4000 MT/s.
Quantity
4 DIMM Slots
Memory Speeds
7600OC

Memory Speeds

The supported RAM memory speeds.

The RAM and processor that will be installed in the computer should be able to reach these speeds, while special settings may be required to reach maximum speeds.
Memory Channels
Dual Channel

Memory Channels

Dual Channel

It is possible to install two identical RAM modules that will work in parallel and provide more speed to applications that require a lot of memory (e.g. video editing). 2. For example, if two identical 8GB RAM modules are installed in a dual channel motherboard, they will perform better than installing one 16GB module.

Internal Connectors

PCI Express x16 3.0
2 Slot

PCI Express x16 3.0

The available slots for PCI Express x16 3.0 expansion cards on the motherboard.

Usually, the graphics card is connected to this slot. The most common version is 3.0, while the latest generation graphics cards use 4.0.
PCI Express x16 4.0
1 Slot

PCI Express x16 4.0

The available PCI Express x16 4.0 expansion card slots of the motherboard.
SATA III 6Gb/s
4 Port

SATA III 6Gb/s

Modern hard drive connection standard.

Most SSD hard drives require this standard to perform at their maximum potential.
M.2 Type
1 PCIe 3.0 Port, 2 PCIe 4.0 Ports

M.2 Type

The number and type of available slots for installing M.2 SSD units.
M.2 Slots
0

External Connectors

Rear USB-A outputs
2 USB 3.2 Ports, 4 USB 2.0 Ports
Rear USB-C outputs
1 USB 3.2 Port
Ethernet (LAN)
1

Ethernet (LAN)

The number of ethernet ports for wired connection to a network that the motherboard has on its back panel.
Screen Connections
DisplayPort, HDMI

Specifications

RGB Lighting
Yes
WiFi/Bluetooth
No
Extra
Bios Flashback

Extra

Bios Flashback

Ability to update the BIOS without requiring a CPU and RAM installed on the motherboard. This advanced feature is intended for experienced users and is useful for supporting newer processors on older motherboards. Please refer to the manufacturer's instructions for the process, as it may vary between manufacturers.

For example, if you want to install a Ryzen 5000 series processor on a chipset that only supports it after a BIOS upgrade, BIOS Flashback can be used without having an older processor on the motherboard.

Sound

Sound Card Channels
7.1
Additional Audio Connections
-

Top Specs

Memory
4x DDR5

Memory

Memory Type and RAM Slots

Indicates the type of RAM memory supported by the motherboard (e.g., DDR4, DDR5) and the number of slots (DIMM slots) for the modules, which determines how much memory can be installed in total.

Important information

Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.

See all specifications

Description & Specifications

Product Details

Size
Micro ATX

Size

The size of the motherboard is expressed with a code name (standard).
2. We make sure that the computer case in which the motherboard will be installed supports the corresponding standard in order to fit it.

Micro ATX
Smaller than ATX, with fewer slots but sufficient for everyday use.
Type
Desktop

Type

Desktop

Motherboards designed for use in desktop computers.

Processor

Supported Processors
AMD
Models
Ryzen
Supported CPU Generation
Zen 4, Zen 5
Socket
AM5

Socket

The processor socket type.

The processor we choose should have the same socket in order to fit into the motherboard.

In addition to the socket, the motherboard chipset must also be supported by the processor.

Chipset

Model
AMD B840

Model

The motherboard chip that manages connections with motherboard components (e.g. CPU, RAM memory, hard disk, USB ports).

The processor we choose must support the motherboard chipset in order to be 100% compatible with each other and to fully utilize the motherboard connections.

If the motherboard chipset is supported by the processor, then the socket will also be compatible.

 

Memory

Memory type
DDR5

Memory type

The type of RAM memory that is compatible with the motherboard.

DDR5

The latest memory type, with speed starting from 4000 MT/s.
Quantity
4 DIMM Slots
Memory Speeds
7600OC

Memory Speeds

The supported RAM memory speeds.

The RAM and processor that will be installed in the computer should be able to reach these speeds, while special settings may be required to reach maximum speeds.
Memory Channels
Dual Channel

Memory Channels

Dual Channel

It is possible to install two identical RAM modules that will work in parallel and provide more speed to applications that require a lot of memory (e.g. video editing). 2. For example, if two identical 8GB RAM modules are installed in a dual channel motherboard, they will perform better than installing one 16GB module.

Internal Connectors

PCI Express x16 3.0
2 Slot

PCI Express x16 3.0

The available slots for PCI Express x16 3.0 expansion cards on the motherboard.

Usually, the graphics card is connected to this slot. The most common version is 3.0, while the latest generation graphics cards use 4.0.
PCI Express x16 4.0
1 Slot

PCI Express x16 4.0

The available PCI Express x16 4.0 expansion card slots of the motherboard.
SATA III 6Gb/s
4 Port

SATA III 6Gb/s

Modern hard drive connection standard.

Most SSD hard drives require this standard to perform at their maximum potential.
M.2 Type
1 PCIe 3.0 Port, 2 PCIe 4.0 Ports

M.2 Type

The number and type of available slots for installing M.2 SSD units.
M.2 Slots
0

External Connectors

Rear USB-A outputs
2 USB 3.2 Ports, 4 USB 2.0 Ports
Rear USB-C outputs
1 USB 3.2 Port
Ethernet (LAN)
1

Ethernet (LAN)

The number of ethernet ports for wired connection to a network that the motherboard has on its back panel.
Screen Connections
DisplayPort, HDMI

Specifications

RGB Lighting
Yes
WiFi/Bluetooth
No
Extra
Bios Flashback

Extra

Bios Flashback

Ability to update the BIOS without requiring a CPU and RAM installed on the motherboard. This advanced feature is intended for experienced users and is useful for supporting newer processors on older motherboards. Please refer to the manufacturer's instructions for the process, as it may vary between manufacturers.

For example, if you want to install a Ryzen 5000 series processor on a chipset that only supports it after a BIOS upgrade, BIOS Flashback can be used without having an older processor on the motherboard.

Sound

Sound Card Channels
7.1
Additional Audio Connections
-

Top Specs

Memory
4x DDR5

Memory

Memory Type and RAM Slots

Indicates the type of RAM memory supported by the motherboard (e.g., DDR4, DDR5) and the number of slots (DIMM slots) for the modules, which determines how much memory can be installed in total.

Important information

Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.

Description

Type: ATX UEFI Mobile Cover

Features:

  • USB Memory
  • Installation guide included
  • Color: Gray
  • Form factor: MicroATX
  • Interface: Gigabit Ethernet
  • Memory: 256 MB
  • Number of memory slots: 4
  • Speakers: 7.1
  • Connections: HDMI x 1, 2 x USB 2.0, USB 2.0 x 4, Ethernet LAN, SATA x 4, M.2 x 3, HDMI 2.1 x 1, DIMM, 2 x USB 3.2 Gen 2 (3.1 Gen 2), PCI Express x16 2.0, DisplayPort x 1, RJ45 x 1
  • Compatible: HDD/SSD PC
  • Includes: SATA screws
  • Does not include: WiFi
  • Chipset: AMD
  • Power Supply: ATX
  • Socket: AMD AM5
  • Memory Type: DDR5
  • Processor family: AMD

AI Advisor

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

Digital Power Design

The PRIME B840M-A-CSM features an 8+2+1 phase power design with discrete MOSFETs, ensuring efficient and stable power delivery for AMD processors and consistent performance for everyday use.

Enhanced DDR5 Performance

Comprehensive memory tuning options are the cornerstone of PRIME motherboards. The PRIME B840M-A-CSM maximizes the capabilities of DDR5 modules, from entry-level to extreme speed kits.
For entry-level modules without EXPO™ support, the ASUS Enhanced Memory Profile (AEMP) automatically detects memory chips and provides optimized profiles for improved performance. For those looking to surpass standard DDR5 speeds, the PRIME B840M-A offers extensive support for AMD Extended Profiles for Overclocking (EXPO™) and a wide range of UEFI settings for further performance enhancements.

Three M.2 slots (up to 64 Gbps)

The PRIME B840M-A-CSM offers a total of three M.2 slots, two of which support data transfer speeds of up to 64 Gbps via PCIe 4.0, and one supports PCIe 3.0. This allows for faster boot and application load times with operating system or application drives.

ASUS Fan Xpert 2+

The ASUS Fan Xpert 2+ software provides comprehensive control of the fans. An auto-tuning function intelligently adjusts all parameters with a single click. There is also an Extreme Quiet mode that reduces the chassis fan speeds below the default minimum limit, so your system remains quiet during light tasks. The fans can also be controlled via the UEFI BIOS.

Cooler Compatibility

ASUS AIO coolers offer powerful performance, high overclocking capabilities, bold aesthetics, and customizable features for new motherboards, giving you the ability to create the gaming machine of your dreams.

Realtek 2.5 Gb Ethernet

The Realtek 2.5 Gb Ethernet reduces CPU load and offers ultra-high TCP and UDP performance for faster and smoother data transfers.

Front USB 5Gbps Type-C®

This motherboard features a USB 5Gbps Type-C® front panel connector for ultra-fast data transfers up to 5Gbps.

Pre-installed I/O shield

The pre-installed I/O shield protects the ports, simplifies the building process, enhances functionality, and improves aesthetics for PC DIY enthusiasts.

BIOS FlashBack™

BIOS FlashBack™ simplifies BIOS updates. Simply load the BIOS file onto a FAT32 USB stick, insert it into the BIOS FlashBack™ port, and press a button - no CPU or memory required.

Manufacturer

Manufacturer Details

Warnings & Safety Information
145,45 €
14,00 €   shipping cost