Asus PRIME B840M-K

Name: Asus PRIME B840M-K
Brand: Asus
SKU: 1388077
Price: 179.82 EUR
Availability: InStock

Picture may differ from actual product, there can be accessories and parts not supplied with the actual product.

ID: 1388077 Product code: 90MB1PK0-M0EAY0

Can be ordered 10 units Availability: 14 days after order approval

Warranty: 3 years

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Ready for dispatch

13.03.2026

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Main product parameters All parameters

Series: ASUS Prime
Plate size: mATX
Chipset: AMD B840
Socket: AM5
Type: DDR5
RAM Slots: 2
Built-in Wi-Fi: Nav
M.2 ports: 2

Basic information

Series : ASUS Prime

Plate size mATX

The physical size of the motherboard. Dateks.lv offers ATX (full size board), mATX (micro ATX) (a board of reduced size) and miniATX size motherboards. Within the housing of an ATX size computer it is possible to place both ATX and mATX motherboard, however, in the mATX housing it is not possible to place an ATX board.

The ATX board has at least 3 memory slots and at least 5 local slots PCI, which means that a well functioning powerful computer can be built on this board. However, a home or office computer does not need this high number of slots, therefore also microATX will be suitable.

The connector of the power supply unit of the motherboard is the power source socket which are currently of ATX and ATX2.0 standard. ATX is an older standard with a 20pin connector (20 "pins"), and ATX2.0 has 4 additional pins (20+4). The motherboards of ATX standard can operate with a ATX2.0 power supply unit (PSU), however the mother board of ATX2.0 standard requires an ATX2.0 power supply unit.

Form-factor is rather a recommendation. However, prior to buying a mother board you should verify the compatibility of the housing size to the motherboard size and its power supply connector.

Chipset AMD B840

The chip bus is the most important criterion of selecting the motherboard (the system logic chips or the voltage transformers). The chip bus determines the CPUs, memory ports and other parameters that are supported by the motherboard.

Each chipset is directly related to a certain CPU platform which are divided based upon the family of CPUs or the connection point of the CPU.

For verifying which chip bus is suitable for your CPU, etc. you should ask our managers.

Socket AM5

The CPU socket is an important factor in selecting the board; the CPU board must be exactly compatible with the CPU that you want to install with the board. Irrespective of the fact that the CPU fits the socket of the motherboard also the support of this CPU has to be taken into account. For verifying which CPUs are supported by the selected motherboard you should visit the website of the manufacturer of the motherboard, find the CPU support section of the relevant motherboard and verify that the specification of this particular board provides for the support of the CPU that you have selected.

Random-access memory (RAM)

Type : DDR5

RAM Slots 2

The number of available memory slots indicates the number of memory modules (plates) that can be installed in the motherboard.

Memory support DDR5 5600MT/s (8000MT/s OC)

The RAM bus determines what type of RAM is supported by the relevant motherboard.

The bus marking contains the memory type DDRII or DDRIII as well as the maximum memory clock frequency that is supported by the mother board. The type of memory is the most important index, memories of different types are physically different, therefore DDRIII memory cannot be connected to the mother board that supports DDRII memory (except the cases when the motherboard supports both types of memory). However the motherboard that support 800Mhz DDRII memory can work with the memory speeds of DDII667 and DDRII533. The mother board with the memory bus speed below the speed of the memory module will be able to operate as fast as the specified bus speed only, i.e. if the memory bus of the motherboard is DDRII667 and the memory DDRII800 is installed it will operate with the speed of DDRII667.

Graphics card

VGA Port PCI-EXPRESS

VGA port or the video card plug. The VGA port must comply with the specification of the video card port you have selected. Older video cards have an AGP port, new cards are manufacturer with a PCI-EXPRESS (PCI-X) port.AGP and PCI-Xpress video cards are not mutually compatible. Prior to buying the motherboard you should verify the compliance of the video card port of both the motherboard and the video card.

Integrated graphics Only with iGPU-ready APU

The parameter that determines whether a video card has been integrated with the motherboard. An integrated video card is suitable for working with the office software, Internet, watching films and playing simple games. If you wish to use graphics applications, play 3D games and watch 3D animations you would need an additional video card.

An integrated video card uses a fraction of the memory included in the mother board, therefore, if your motherboard has 1Gb memory and in the settings of the video card of the mother board it is stated that it takes 256mb the operating system will display the available memory volume of approximately 700 Mb.
Prior to buying a motherboard with a built-in video card you should verify whether it has an additional video card port for further upgrades if these are required

Ports and equipment

D-Sub : 0

DisplayPort : 0

DVI : 0

HDMI : 1

Integrated sound card : Realtek 7.1 Audio CODEC

PCI Ports 0

PCI ports present the most popular way of supplementing the computer functions with additional cards (sound, network, communications, video surveillance, etc.). Newer boards, thanks to the PCI-Express standard, have a small number of PCI extension ports, therefore, prior to buying the motherboard you should verify if the number of PCI ports allows the connection of all the PCI cards you need.

Wireless connections

Built-in Bluetooth : Nav

Built-in Wi-Fi : Nav

External ports

External USB 2.0 : 2

External USB Type-C (USB 3.2 Gen2) : 0

External USB Type-C (USB 4.0) : 0

External USB 3.0 (USB 3.2 Gen1) : 4

External USB 3.1 (USB 3.2 Gen2) : 0

Internal ports

Internal A-RGB 5V (3-pin) : 3

Internal RGB 12V (4-pin) : 0

Internal USB 2.0 : 2

Internal USB 3.0 : 1

Internal USB Type-C : 0

M.2 ports : 2

SATA3 ports : 4

More detailed specification

Additional information in manufacturers website Asus PRIME B840M-K

BIOS - BIOS memory size - 256 Mbit
BIOS - BIOS type - UEFI AMI
Brand - ASUS
BrandPartCode - 90MB1PK0-M0EAY0
Category - Motherboards
dimensionalWeight - 842
Expansion slots - Number of M.2 (M) slots - 2
Expansion slots - PCI Express x16 (Gen 3.x) slots - 1
Expansion slots - PCI Express x16 (Gen 4.x) slots - 1
Features - Audio output channels - 7.1 channels
Features - Component for - PC
Features - Motherboard chipset - AMD B840
Features - Motherboard chipset family - AMD
Features - Motherboard form factor - micro ATX
Features - Product colour - Black
Features - Windows operating systems supported - Windows 10 x64
Features - Windows operating systems supported - Windows 10 x64, Windows 11
Features - Windows operating systems supported - Windows 11
Graphics - Parallel processing technology support - Not supported
GTIN - 4711636435048
Internal I/O - 12V power connector - Yes
Internal I/O - ATX Power connector (24-pin) - Yes
Internal I/O - CPU fan connector - Yes
Internal I/O - EPS power connector (8-pin) - Yes
Internal I/O - Front panel audio connector - Yes
Internal I/O - Front panel connector - Yes
Internal I/O - Number of chassis fan connectors - 3
Internal I/O - Number of COM connectors - 1
Internal I/O - Number of RGB LED pin headers - 3
Internal I/O - Number of SATA III connectors - 4
Internal I/O - RGB LED pin header - Yes
Internal I/O - S/PDIF out connector - Yes
Internal I/O - TPM connector - Yes
Internal I/O - USB 2.0 connectors - 2
Internal I/O - USB 3.2 Gen 1 (3.1 Gen 1) connectors - 2
LongDesc - B840M-KASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen™ 9000 series processors. The PRIME B840M-K 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.
LongProductName - PRIME B840M-K AMD B840 micro-ATX (DDR5, M.2, Realtek 2.5Gb Ethernet, HDMI, Front USB 5Gbps Type-C, Aura Sync)
LongSummaryDescription - ASUS PRIME B840M-K. Processor manufacturer: AMD, Processor socket: Socket AM5, Compatible processor series: AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series. Supported memory types: DDR5-SDRAM, Maximum internal memory: 128 GB, Memory slots type: DIMM. Supported storage drive interfaces: M.2, SATA III, Supported storage drive types: HDD & SSD, RAID levels: 0, 1, 5, 10. Ethernet interface type: 2.5 Gigabit Ethernet. Component for: PC, Motherboard form factor: micro ATX, Motherboard chipset family: AMD
Memory - ECC сompatibility - ECC & Non-ECC
Memory - Maximum internal memory - 128 GB
Memory - Memory channels - Dual-channel
Memory - Memory slots type - DIMM
Memory - Number of memory slots - 2
Memory - Supported memory types - DDR5-SDRAM
Memory - Unbuffered memory - Yes
Network - Ethernet interface type - 2.5 Gigabit Ethernet
Network - Ethernet LAN - Yes
Network - Wi-Fi - No
Packaging content - Cables included - SATA
Packaging content - Screws included - Yes
Packaging data - Package depth - 263 mm
Packaging data - Package height - 51.5 mm
Packaging data - Package weight - 1.02 kg
Packaging data - Package width - 270 mm
Processor - Compatible processor series - AMD Ryzen 7000 Series
Processor - Compatible processor series - AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series
Processor - Compatible processor series - AMD Ryzen 8000 Series
Processor - Compatible processor series - AMD Ryzen 9000 Series
Processor - Processor manufacturer - AMD
Processor - Processor socket - Socket AM5
Processor - Supported processor sockets - Socket AM5
producerCode - 90MB1PK0-M0EAY0
productName - ASUS PRIME B840M-K AMD B840 Socket AM5 micro ATX
ProductName - PRIME B840M-K
productSize - Normal
Rear panel I/O ports - Ethernet LAN (RJ-45) ports - 1
Rear panel I/O ports - HDMI ports quantity - 1
Rear panel I/O ports - USB 2.0 ports quantity - 2
Rear panel I/O ports - USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity - 4
ShortSummaryDescription - ASUS PRIME B840M-K, AMD, Socket AM5, AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series, Socket AM5, DDR5-SDRAM, 128 GB
sizeX - 270
sizeY - 260
sizeZ - 60
Storage controllers - Number of HDDs supported - 4
Storage controllers - Number of storage drives supported - 6
Storage controllers - RAID levels - 0
Storage controllers - RAID levels - 0, 1, 5, 10
Storage controllers - RAID levels - 1
Storage controllers - RAID levels - 5
Storage controllers - RAID levels - 10
Storage controllers - RAID support - Yes
Storage controllers - Supported storage drive interfaces - M.2, SATA III
Storage controllers - Supported storage drive types - HDD & SSD
Title - ASUS PRIME B840M-K AMD B840 Socket AM5 micro ATX
URL - https://www.asus.com/motherboards-components/motherboards/prime/prime-b840m-k/
WarrantyInfo -
warrantyLength - 36
warrantyType - G
weight - 1020
Weight & dimensions - Depth - 221 mm
Weight & dimensions - Width - 244 mm