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header-product MSI PRO B840M-B motherboard AMD B840 Socket AM5 micro ATX
97.99 €

MSI PRO B840M-B motherboard AMD B840 Socket AM5 micro ATX

Fast delivery available
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Short description

The MSI PRO B840M-B motherboard features an AMD B840 chipset and Socket AM5, compatible with AMD Ryzen 7000/8000/9000 series processors. It supports DDR5 memory up to 128GB and offers multiple storage options including M.2 and SATA III for HDD and SSD drives. With a micro ATX form factor, it is designed for compact PC builds. The board includes a 2.5 Gigabit Ethernet interface for high-speed networking, making it suitable for both gaming and professional use.
Available at price 97.99 €: 2 pcs.
Total available for order: 213 pcs.
Warranty: 3 Years
SKU: 11463502
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1.99 €

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From 4.99 € (Weight: 2.00 kg)
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Product information

Description

The MSI PRO B840M-B is a micro ATX motherboard with the AMD B840 chipset and Socket AM5, compatible with AMD Ryzen 7000, 8000 and 9000 series desktop processors. It supports DDR5 memory in dual-channel configuration up to 128 GB and offers multiple storage options including Lightning Gen 4 x4 M.2 and SATA III for HDDs and SSDs. The board features a Direct 7+2+1 digital power design with an 8-pin CPU connector, an optimized chipset heatsink for quieter operation and dust reduction, and a 2.5 Gigabit Ethernet interface for high-bandwidth, low-latency networking.

Advantages

The PRO B840M-B provides stable power delivery through a 7+2+1 VRM phase layout and P-PAK components to sustain heavy workloads. Support for DDR5-8000+ (OC), a 6-layer PCB with 2oz thickened copper, and Core Boost and Memory Boost technologies improve overall performance. Quick-install features such as EZ M.2 Clip II and EZ PCIe Clip II simplify assembly. Integrated audio codecs and PCIe 4.0 expansion ensure broad compatibility for professional and multimedia use.

Suitable for

  • Compact professional workstations requiring reliable multi-core CPU performance
  • Home or office PCs with high-speed networking needs (2.5G LAN)
  • Builders wanting DDR5 support and PCIe 4.0 storage for fast boot and load times

Key specifications

  • Chipset: AMD B840
  • CPU support: AMD Ryzen 7000 / 8000 / 9000 Series (Socket AM5)
  • Memory: DDR5, 2 DIMM, dual channel, up to 128 GB, DDR5-8000+ (OC)
  • Form factor: Micro ATX
  • Power design: Direct 7+2+1 digital power phases, 8-pin CPU power connector
  • Storage: Lightning Gen 4 x4 M.2, M.2 slots and SATA III ports, up to 6 storage drives supported
  • LAN: 2.5 Gigabit Ethernet
  • Audio: Realtek ALC897, 7.1 channels
  • BIOS: UEFI AMI 256 Mbit, ACPI 6.5

How to use

Install the motherboard into a compatible micro ATX case and connect an AM5-compatible Ryzen processor. Populate up to two DDR5 DIMMs following the motherboard manual for optimal dual-channel operation. Connect the 8-pin CPU power cable from a compatible PSU and attach storage devices to the M.2 slots and SATA III ports as needed. Use the EZ M.2 Clip II and EZ PCIe Clip II to secure expansion devices without screws. After assembly, enter the UEFI BIOS to configure memory profiles, storage boot order and network settings.

Usage recommendations

For stable operation under sustained loads, use a quality PSU with the required 8-pin CPU connector, install adequate cooling for the CPU and chassis, and update the BIOS to the latest version before first use. Enable memory XMP/EXPO profiles in BIOS only after confirming memory compatibility.

Specifications

BIOS type: The BIOS (Basic Input/Output System) initializes and tests system hardware components, and loads a bootloader or an operating system from a mass memory device. The BIOS additionally provides abstraction layer for the hardware, i.e. a consistent way for application programs and operating systems to interact with the keyboard, display, and other input/output devices. There are several types of BIOS, including the motherboard ROM BIOS, video BIOS, drive controller BIOS, network adapter BIOS, and SCSI adapter BIOS.
UEFI AMI
Audio output channels: An audio output channel is an electric circuit which acts as a path for a signal produced by a device. A device may have several audio output channels.
7.1
Motherboard chipset: The chipset connects the microprocessor to the rest of the motherboard.
AMD B840
Motherboard chipset family: The category of motherboard chipset e.g. Intel, AMD.
AMD
Motherboard form factor: Design of the motherboard (ATX, BTX etc).
Micro ATX
Component for: What this product is used as a part of (component for).
PC
Wi-Fi: Popular technology that allows an electronic device to exchange data or connect to the internet wirelessly using radio waves.
No
DVI-D ports quantity: This is the amount of DVI-I interfaces. Digital Visual Interface (DVI) is a video display interface developed by the Digital Display Working Group (DDWG). The digital interface is used to connect a video source to a display device, such as a computer monitor. DVI-D means DVI digital, which means it can only support digital, but not analog.
0
HDMI ports quantity: The number of sockets (ports) for HDMI connections. HDMI (High-Definition Multimedia Interface) is a compact audio/video interface for transferring uncompressed video data and compressed/uncompressed digital audio data from a HDMI-compliant device ("the source device") to a compatible computer monitor, video projector, digital television, or digital audio device. HDMI is a digital replacement for existing analog video standards.
1
VGA (D-Sub) ports quantity: Number of VGA (D-Sub) ports (connecting interfaces) in the device. The VGA (D-Sub) connector is a 15 pin connector between a computer and a monitor. It was first introduced in 1987 by IBM.
0
Ethernet LAN (RJ-45) ports: Number of Ethernet LAN (RJ-45) ports (connecting interfaces) in the device. Ethernet LAN (RJ-45) ports allow a computer to connect to the ethernet.
1
USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity: Number of USB 3.1 (3.1 Gen 2) ports with Type-C connector. USB 3.1 (3.1 Gen 2) is USB interface version which supports transfer rate up to 10 Gbit/s (SuperSpeed+). USB Type-C connector has symmetrical design architecture and compatible with Thunderbolt 3 interface.
0
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity:
0
USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity: Number of USB 3.0 (3.1 Gen 1) ports with Type-C connector. USB 3.0 (3.1 Gen 1) is USB interface version which supports transfer rate up to 5 Gbit/s (SuperSpeed). USB Type-C connector has symmetrical design architecture and compatible with Thunderbolt 3 interface.
0
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity:
4
USB 2.0 ports quantity: Number of USB 2.0 ports (connecting interfaces) in the device. USB 2.0 was released in April 2000 (now called "Hi-Speed"), adding higher maximum signaling rate of 480 Mbit/s (effective throughput up to 35 MB/s or 280 Mbit/s), USB 2.0 ports are usually black.
2
Number of SATA III connectors: Serial ATA (Advanced Technology Attachment) (SATA) is a computer bus interface that connects host bus adapters to mass storage devices such as hard disk drives and optical drives. SATA III (revision 3.x) interface, formally known as SATA 6Gb/s, is a third generation SATA interface running at 6.0Gb/s. The bandwidth throughput, which is supported by the interface, is up to 600MB/s. This interface is backwards compatible with SATA 3 Gb/s interface.
4
USB 3.2 Gen 2 (3.1 Gen 2) connectors:
1
USB 3.2 Gen 1 (3.1 Gen 1) connectors: This is a connector (normally attached to a cable) for USB 3.0. USB 3.0 is the second major revision of the Universal Serial Bus (USB) standard for computer connectivity. First introduced in 2008, USB 3.0 adds a new transfer mode called "SuperSpeed," (distinguishable from USB 2.0 by either the blue colour of the port or the initials SS) capable of transferring data at up to 5Gbit/s—more than ten times as fast as the 480 Mbit/s top speed of USB 2.0.
2
USB 2.0 connectors: The end of a cable with a USB 2.0 connector. USB 2.0 was released in April 2000 (now called "Hi-Speed"), adding higher maximum signaling rate of 480 Mbit/s (effective throughput up to 35 MB/s or 280 Mbit/s), in addition to the "USB 1.x Full Speed" signaling rate of 12 Mbit/s. USB 2.0 connectors are usually colored black.
4
Maximum internal memory: The maximum internal memory which is available in the product.
128 GB
Number of memory slots:
2
Processor socket: Mechanical component(s) that provides mechanical and electrical connections between a microprocessor and a printed circuit board (PCB). This allows the processor to be replaced without soldering.
Socket AM5
Processor manufacturer: The manufacturer that produced the processor.
AMD
Supported storage drive interfaces:
Micro SATA III, M.2
Supported memory types: Types of memory which can be used with the product.
DDR5-SDRAM
All features

Other features

mSATA ports quantity:
0

Weight & dimensions

Depth: The distance from the front to the back of something.
243.8 mm
Width: The measurement or extent of something from side to side.
226 mm

BIOS

BIOS memory size:
256 Mbit
BIOS type: The BIOS (Basic Input/Output System) initializes and tests system hardware components, and loads a bootloader or an operating system from a mass memory device. The BIOS additionally provides abstraction layer for the hardware, i.e. a consistent way for application programs and operating systems to interact with the keyboard, display, and other input/output devices. There are several types of BIOS, including the motherboard ROM BIOS, video BIOS, drive controller BIOS, network adapter BIOS, and SCSI adapter BIOS.
UEFI AMI

Expansion slots

2nd M.2 highest PCI Express generation:
4.0
2nd M.2 largest key size:
2280
1st M.2 highest PCI Express generation:
4.0
1st M.2 largest key size:
2280
Number of M.2 (M) slots:
2
PCI Express x16 slots:
2

Features

Windows operating systems supported: Windows vesions wich can be used with the device.
Windows 11 x64
Product colour: The colour e.g. red, blue, green, black, white.
Black
Audio output channels: An audio output channel is an electric circuit which acts as a path for a signal produced by a device. A device may have several audio output channels.
7.1
Audio chip:
Realtek ALC897
Motherboard chipset: The chipset connects the microprocessor to the rest of the motherboard.
AMD B840
Motherboard chipset family: The category of motherboard chipset e.g. Intel, AMD.
AMD
Motherboard form factor: Design of the motherboard (ATX, BTX etc).
Micro ATX
Component for: What this product is used as a part of (component for).
PC

Network

Wi-Fi: Popular technology that allows an electronic device to exchange data or connect to the internet wirelessly using radio waves.
No
Ethernet interface type:
25 Gigabit Ethernet
Ethernet LAN: An Ethernet LAN (Local Area Network) interface is present, for a wired conection via a cable.
Yes

Rear panel I/O ports

DVI-D ports quantity: This is the amount of DVI-I interfaces. Digital Visual Interface (DVI) is a video display interface developed by the Digital Display Working Group (DDWG). The digital interface is used to connect a video source to a display device, such as a computer monitor. DVI-D means DVI digital, which means it can only support digital, but not analog.
0
HDMI version:
2.1
HDMI ports quantity: The number of sockets (ports) for HDMI connections. HDMI (High-Definition Multimedia Interface) is a compact audio/video interface for transferring uncompressed video data and compressed/uncompressed digital audio data from a HDMI-compliant device ("the source device") to a compatible computer monitor, video projector, digital television, or digital audio device. HDMI is a digital replacement for existing analog video standards.
1
VGA (D-Sub) ports quantity: Number of VGA (D-Sub) ports (connecting interfaces) in the device. The VGA (D-Sub) connector is a 15 pin connector between a computer and a monitor. It was first introduced in 1987 by IBM.
0
Ethernet LAN (RJ-45) ports: Number of Ethernet LAN (RJ-45) ports (connecting interfaces) in the device. Ethernet LAN (RJ-45) ports allow a computer to connect to the ethernet.
1
USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity: Number of USB 3.1 (3.1 Gen 2) ports with Type-C connector. USB 3.1 (3.1 Gen 2) is USB interface version which supports transfer rate up to 10 Gbit/s (SuperSpeed+). USB Type-C connector has symmetrical design architecture and compatible with Thunderbolt 3 interface.
0
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity:
0
USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity: Number of USB 3.0 (3.1 Gen 1) ports with Type-C connector. USB 3.0 (3.1 Gen 1) is USB interface version which supports transfer rate up to 5 Gbit/s (SuperSpeed). USB Type-C connector has symmetrical design architecture and compatible with Thunderbolt 3 interface.
0
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity:
4
USB 2.0 ports quantity: Number of USB 2.0 ports (connecting interfaces) in the device. USB 2.0 was released in April 2000 (now called "Hi-Speed"), adding higher maximum signaling rate of 480 Mbit/s (effective throughput up to 35 MB/s or 280 Mbit/s), USB 2.0 ports are usually black.
2

Internal I/O

Number of RGB LED pin headers:
3
RGB LED pin header:
Yes
Number of water pump connectors:
1
Number of chassis fan connectors:
5
Number of CPU fan connectors:
1
Total number of SATA connectors:
4
Number of SATA Express connectors:
0
Number of SATA connectors:
0
Number of SATA II connectors: Serial ATA (Advanced Technology Attachment) (SATA) is a computer bus interface that connects host bus adapters to mass storage devices such as hard disk drives and optical drives. SATA II (revision 2.x) interface, formally known as SATA 3Gb/s, is a second generation SATA interface running at 3.0 Gb/s. The bandwidth throughput, which is supported by the interface, is up to 300MB/s.
0
Number of SATA III connectors: Serial ATA (Advanced Technology Attachment) (SATA) is a computer bus interface that connects host bus adapters to mass storage devices such as hard disk drives and optical drives. SATA III (revision 3.x) interface, formally known as SATA 6Gb/s, is a third generation SATA interface running at 6.0Gb/s. The bandwidth throughput, which is supported by the interface, is up to 600MB/s. This interface is backwards compatible with SATA 3 Gb/s interface.
4
USB 3.2 Gen 2 (3.1 Gen 2) connectors:
1
USB 3.2 Gen 1 (3.1 Gen 1) connectors: This is a connector (normally attached to a cable) for USB 3.0. USB 3.0 is the second major revision of the Universal Serial Bus (USB) standard for computer connectivity. First introduced in 2008, USB 3.0 adds a new transfer mode called "SuperSpeed," (distinguishable from USB 2.0 by either the blue colour of the port or the initials SS) capable of transferring data at up to 5Gbit/s—more than ten times as fast as the 480 Mbit/s top speed of USB 2.0.
2
USB 2.0 connectors: The end of a cable with a USB 2.0 connector. USB 2.0 was released in April 2000 (now called "Hi-Speed"), adding higher maximum signaling rate of 480 Mbit/s (effective throughput up to 35 MB/s or 280 Mbit/s), in addition to the "USB 1.x Full Speed" signaling rate of 12 Mbit/s. USB 2.0 connectors are usually colored black.
4

Graphics

On-board graphics card: Graphics hardware which is built into the motherboard or CPU, as opposed to a separate graphics adapter (video card). On-board graphics uses CPU and RAM for graphics processing.
No

Storage controllers

RAID levels: RAID is a storage technology that combines multiple disk drive components into a logical unit for the purposes of data redundancy and performance improvement. Data is distributed across the drives in one of several ways, referred to as RAID levels, depending on the specific level of redundancy and performance required.
1, 10
RAID support: The device uses RAID, which is a storage technology that combines multiple disk drive components into a logical unit for the purposes of data redundancy and performance improvement. Data is distributed across the drives in one of several ways, referred to as RAID levels, depending on the specific level of redundancy and performance required.
Yes
Number of HDDs supported: The total number of hard drives that can be used in/with this product.
4
Number of storage drives supported: How many storage drives can be fit into the product at once.
6
Supported storage drive interfaces:
Micro SATA III, M.2
Supported storage drive types: The type of storage drives the device is compatible with.
HDD & SSD

Memory

Maximum internal memory: The maximum internal memory which is available in the product.
128 GB
Supported memory clock speed (max):
8000 MHz
Supported memory clock speeds: Memory clock speed is the time it takes for a computer to complete basic operations. It refers to the computer's processing speed and is measured in hertz. It is however not such a reliable measure of a computer's speed as it doesn't take into account other factors like RAM and cache size.
5600, 4800
ECC сompatibility:
non-ECC
Memory channels:
Dual-channel
Memory slots type: A memory slot, also known as a memory socket or RAM slot, is what allows computer memory (RAM) to be inserted into the computer. Depending on the motherboard, there will usually be 2 to 4 memory slots (sometimes more on high-end motherboards). The most common types of RAM are SDRAM and DDR for desktop computers and SODIMM for laptop computers, each having various types and speeds.
DIMM
Number of memory slots:
2
Supported memory types: Types of memory which can be used with the product.
DDR5-SDRAM

Processor

Supported processor sockets: The sockets (plugs) for processors that are supported (can be used) by the device.
Socket AM5
Processor socket: Mechanical component(s) that provides mechanical and electrical connections between a microprocessor and a printed circuit board (PCB). This allows the processor to be replaced without soldering.
Socket AM5
Processor manufacturer: The manufacturer that produced the processor.
AMD

Description

Machine translation.

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Customer reviews

Customer questions

FAQ

How much does the Motherboard MSI PRO B840M-B cost, and is it available for purchase?

The price is 97.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 213 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 26.10.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

Can Motherboard MSI PRO B840M-B be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. We work with leading banks and leasing companies in Latvia, allowing you to make your purchase on convenient terms — with a minimal down payment and a repayment period from 3 to 36 months. You can apply for credit or installments for the Motherboard MSI PRO B840M-B online, and the application process is as simple as possible:
  • Select the product on the website and add it to your cart;
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  • Fill in the required details for the lending partner;
  • Receive a decision within a few minutes.
For more information about available payment options, interest-free installment terms, and credit conditions in Latvia, please visit the Payment page.

Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

What is the warranty period?

All MSI products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized MSI service centers and through AiO.lv

Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. We will assist with consultation, warranty claim processing, and coordination with certified service centers.

How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: bios type, audio output channels, motherboard chipset, motherboard chipset family, motherboard form factor, component for, wi-fi, dvi-d ports quantity, hdmi ports quantity, vga (d-sub) ports quantity, ethernet lan (rj-45) ports, usb 3.2 gen 2 (3.1 gen 2) type-c ports quantity, usb 3.2 gen 2 (3.1 gen 2) type-a ports quantity, usb 3.2 gen 1 (3.1 gen 1) type-c ports quantity, usb 3.2 gen 1 (3.1 gen 1) type-a ports quantity, usb 2.0 ports quantity, number of sata iii connectors, usb 3.2 gen 2 (3.1 gen 2) connectors, usb 3.2 gen 1 (3.1 gen 1) connectors, usb 2.0 connectors, maximum internal memory, number of memory slots, processor socket, processor manufacturer, supported storage drive interfaces, supported memory types, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

Where can I download the instructions for Motherboard MSI PRO B840M-B?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.
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