MSI PRO B840M-B motherboard AMD B840 Socket AM5 micro ATX
MSI PRO B840M-B, AMD, Socket AM5, AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series, Socket AM5,...Read full description ↓
| Date | Price |
|---|---|
| 20 April 2026 | £79.99 |
| 5 May 2026 | £79.99 |
| 8 May 2026 | £85.81 |
| 9 May 2026 | £84.68 |
| 25 May 2026 | £79.99 |
| 12 June 2026 | £89.49 |
| 15 June 2026 | £79.99 |
| 17 June 2026 | £79.95 |
| 19 June 2026 | £79.99 |
| 26 June 2026 | £69.99 |
| 29 June 2026 | £79.99 |
| 2 July 2026 | £81.99 |
| 5 July 2026 | £79.99 |
| 9 July 2026 | £79.95 |
| 12 July 2026 | £79.95 |
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Product Information
BUSINESS ELEGANCE
The PRO Series is tailored to professionals from all walks of life. The lineup features impressive performance and high quality, while aiming to provide users incredible experience. Users who care about productivity and efficiency can definitely count on the MSI PRO Series to assist you with multitasking and increasing efficiency.
MSI motherboards are designed with advanced hardware and technology, well-supporting the demanding computing usage of gaming and AI. Moreover, we also introduce AI to MSI Center and BIOS, making everything more effortless than before.
DIRECT 7+2+1 POWER DESIGN
Unleash and sustain the maximum performance with a VRM design built with a total of 7+2+1 digital power phases. With an 8-pin power connector, PRO B840M-B is ready for the challenge of heavy-loading tasks.
Chipset Heatsink
The chipset heatsink is designed to reduce dust and noise and capable of maintaining high efficiency of heat dissipation.
HIGH-BANDWIDTH AND LOW-LATENCY NETWORK
MSI’s premium network solution provides incredible data transfer speed for demanding users.
Product
- Name
- MSI PRO B840M-B motherboard AMD B840 Socket AM5 micro ATX
- Category
- Motherboards
- Brand
- MSI
Weight & dimensions
- Width
- 226 mm
- Depth
- 243.8 mm
Memory
- Supported memory types
- DDR5-SDRAM
- Number of memory slots
- 2
- Maximum internal memory
- 128 GB
- Memory slots type
- DIMM
- Memory channels
- Dual-channel
- ECC сompatibility
- Non-ECC
- Supported memory clock speeds
- 4800,5600,8000 MHz
- Supported memory clock speed (max)
- 8000 MHz
Processor
- Processor manufacturer
- AMD
- Processor socket
- Socket AM5
- Compatible processor series
- AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series
- Supported processor sockets
- Socket AM5
Rear panel I/O ports
- USB 2.0 ports quantity
- 2
- USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity
- 4
- USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity
- 0
- USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity
- 0
- USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity
- 0
- Ethernet LAN (RJ-45) ports
- 1
- VGA (D-Sub) ports quantity
- 0
- HDMI ports quantity
- 1
- DVI-D ports quantity
- 0
- HDMI version
- 2.1
Internal I/O
- USB 2.0 connectors
- 4
- USB 3.2 Gen 1 (3.1 Gen 1) connectors
- 2
- USB 3.2 Gen 2 (3.1 Gen 2) connectors
- 1
- Number of SATA III connectors
- 4
- Number of SATA II connectors
- 0
- Number of SATA connectors
- 0
- Number of SATA Express connectors
- 0
- Total number of SATA connectors
- 4
- Number of CPU fan connectors
- 1
- Number of chassis fan connectors
- 5
- Number of water pump connectors
- 1
- RGB LED pin header
- Yes
- Number of RGB LED pin headers
- 3
Network
- Wi-Fi
- No
- Ethernet LAN
- Yes
- Ethernet interface type
- 2.5 Gigabit Ethernet
- LAN controller
- Realtek RTL8125D
Expansion slots
- PCI Express x16 slots
- 2
- Number of M.2 (M) slots
- 2
- 1st M.2 largest key size
- 2280
- 1st M.2 highest PCI Express generation
- 4.0
- 2nd M.2 largest key size
- 2280
- 2nd M.2 highest PCI Express generation
- 4.0
BIOS
- BIOS type
- UEFI AMI
- BIOS memory size
- 256 Mbit
- ACPI version
- 6.5
- System Management BIOS (SMBIOS) version
- 3.7
Other features
- mSATA ports quantity
- 0
Graphics
- On-board graphics card
- No
Features
- Component for
- PC
- Motherboard form factor
- micro ATX
- Motherboard chipset family
- AMD
- Motherboard chipset
- AMD B840
- Audio output channels
- 7.1 channels
- Audio chip
- Realtek ALC897
- Product colour
- Black
- Windows operating systems supported
- Windows 11 x64
Storage controllers
- Supported storage drive interfaces
- M.2, Micro SATA III
- Supported storage drive types
- HDD & SSD
- Number of HDDs supported
- 4
- Number of storage drives supported
- 6
- RAID support
- Yes
- RAID levels
- 0, 1, 10
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