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MSI Pro B840M B Review | 107 Data compared

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  • Avg. price: ~£80
  • CPU socket: AM5
  • Chipset: AMD B840
  • Form factor: microATX

MSI Pro B840M B review. Compare 107 technical specifications and user reviews to see how it ranks among motherboards and if it is worth buying.

6.1

Overall score

What it is: An overall evaluation of the motherboard's quality, based on technical analyses and user reviews.

When it matters: When you need a quick reference to identify the best motherboards on the market.

Score components:

90.0%

6.0

Technical Score

10.0%

7.0

User score

Good
6.0

Technical Score

What it is: An assessment of the motherboard's technical performance, covering key areas such as power delivery, CPU and memory support, expansion, storage, connectivity, cooling, BIOS features, and design.

When it matters: When you want to compare motherboards based on technical performance and available features.

Score components:

19.0%

6.2

Memory

16.0%

8.2

Platform & Features

16.0%

6.1

Storage

15.0%

7.3

Network

13.0%

2.3

Ports & USB

8.0%

2.6

Expansion

8.0%

6.1

Power & Cooling

5.0%

8.0

Audio

Good
7.0

User score

What it is: A rating that combines user reviews and the total number of reviews received by the motherboard.

When it matters: When you want to understand how a motherboard performs in real-world builds and how reliable it is in terms of stability, BIOS usability, connectivity, and long-term ownership.

Score components:

70.0%

8.7

User reviews

30.0%

3.0

Popularity

User score:
United Kingdom
amazon
4.2
(21)
amazon
4.8
(7)
United States
Amazon_logo.png
4.2
(21)
Amazon_logo.png
4.9
(7)

(Reviews last updated: May 2026)

Very good
  • 6.5
    Gaming

    Score components:

    28.0%

    5.7

    VRM phases

    22.0%

    5.5

    N. of M.2 sockets

    18.0%

    10

    LAN speed

    17.0%

    10

    Maximum RAM speed

    15.0%

    1.0

    N. of PCIe 5.0 x16 slots

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Best prices in UK

Best rankings

?

Available: ranking among products currently available (including other versions of this product).
All: ranking among all products in the database.

Verdict

The MSI PRO B840M-B is a budget-oriented micro-ATX motherboard built on the AMD AM5 socket and B840 chipset, designed for AMD Ryzen 7000, 8000, and 9000 series processors. It features a stable 7+2+1 digital power phase design and supports high-speed dual-channel DDR5 memory with overclocking potential exceeding 8000+ MT/s. Connectivity is highlighted by two Lightning Gen4 M.2 slots (64Gbps), a reinforced PCIe 4.0 x16 slot for heavy GPUs, and a Realtek 2.5G LAN controller for high-speed networking. Pros include its excellent value, tool-free 'EZ M.2 Clip II' and 'EZ PCIe Clip II' for easy assembly, and a 6-layer PCB with thickened copper for enhanced heat dissipation. However, its cons include the lack of integrated Wi-Fi, only two memory DIMM slots, and a basic Realtek ALC897 audio codec that may not satisfy users seeking premium sound quality.

Technical Specifications of MSI Pro B840M B

Technical Score

What it is: An assessment of the motherboard's technical performance, covering key areas such as power delivery, CPU and memory support, expansion, storage, connectivity, cooling, BIOS features, and design.

When it matters: When you want to compare motherboards based on technical performance and available features.

Score components:

19.0%

6.2

Memory

16.0%

8.2

Platform & Features

16.0%

6.1

Storage

15.0%

7.3

Network

13.0%

2.3

Ports & USB

8.0%

2.6

Expansion

8.0%

6.1

Power & Cooling

5.0%

8.0

Audio

6.0
MSI Pro B840M B has a technical score of 5.96 points, which is lower than that of 57.7% of products in this category.
User score

What it is: A rating that combines user reviews and the total number of reviews received by the motherboard.

When it matters: When you want to understand how a motherboard performs in real-world builds and how reliable it is in terms of stability, BIOS usability, connectivity, and long-term ownership.

Score components:

70.0%

8.7

User reviews

30.0%

3.0

Popularity

User score:
United Kingdom
amazon
4.2
(21)
amazon
4.8
(7)
United States
Amazon_logo.png
4.2
(21)
Amazon_logo.png
4.9
(7)

(Reviews last updated: May 2026)

7.0
MSI Pro B840M B has a user score of 7 points, which is lower than that of 78.4% of products in this category.
Popularity
What it is: An indicator based on the number of reviews received by the motherboard.
When it matters: When you prefer a motherboard that has already been bought and reviewed by many other users.
3.0
MSI Pro B840M B has a popularity of 3 points, which is lower than 59.8% of products in this category.
Ratio quality/price

What it is: An indicator that combines the motherboard's overall rating with its cost.

When it matters: When you are looking for a motherboard that offers a strong balance of features, performance, and price.

Score components:

60.0%

6.1

Overall score

40.0%

10

Price

7.2
MSI Pro B840M B has a quality-to-price ratio of 7.2 points, which is lower than 54% of products in this category.
Brand name
What it is: The brand that makes the motherboard.
When it matters: When you have a brand preference for support, BIOS, or build quality.

Importance: MEDIUM

MSI
CPU socket
What it is: The socket type the motherboard is built to support.
When it matters: When you need the motherboard to match a specific CPU.

Importance: HIGH

AM5
MSI Pro B840M B uses the AM5 CPU socket, which is more advanced than that of 85.8% of motherboards and equal to that of 14.2% of motherboards.
CPU platform

Importance: MEDIUM

AMD
Chipset
What it is: The chipset that defines the motherboard platform and many of its features.
When it matters: When you compare platform features, connectivity, and CPU support.

Importance: HIGH

AMD B840
MSI Pro B840M B uses the AMD B840 chipset, which is more advanced than that of 83.7% of motherboards and equal to that of 0.5% of motherboards.
Form factor
What it is: The physical size standard of the motherboard, such as ATX or Micro-ATX.
When it matters: When you need the board to fit a specific case size.

Importance: HIGH

microATX
MSI Pro B840M B has the microATX form factor, which is less versatile than that of 52.2% of motherboards and equal to that of 32.4% of motherboards.
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DDR memory version
What it is: The RAM generation the motherboard supports, such as DDR4 or DDR5.
When it matters: When you need the board to match a certain memory platform.

Importance: HIGH

Good value: DDR5

DDR5
MSI Pro B840M B uses DDR5 memory, which is newer than that of 64.7% of motherboards and equal to that of 35.3% of motherboards.
Memory slots
What it is: The number of RAM slots on the motherboard.
When it matters: When you want more room for future memory upgrades.

Importance: HIGH

Good value: >=4

2
MSI Pro B840M B has 2 Memory slots, which is fewer than 78.6% of motherboards and equal to 21.4% of motherboards.
Maximum memory capacity
What it is: The largest total amount of RAM the motherboard supports.
When it matters: When you plan a build with very high memory capacity.

Importance: HIGH

Good value: >=128 GB

128 GB
MSI Pro B840M B supports up to 128 GB of memory, which is more than 40.4% of motherboards and equal to 32.1% of motherboards.
Memory channels
What it is: The memory channel configuration supported by the motherboard platform.
When it matters: When memory bandwidth matters for your build.

Importance: MEDIUM

2
MSI Pro B840M B supports 2 memory channels, which is more than 0.2% of motherboards and equal to 92.5% of motherboards.
Maximum RAM speed
What it is: The highest officially supported memory speed for the motherboard.
When it matters: When you choose RAM and want to know the supported speed ceiling.

Importance: HIGH

Good value: >=6400 MT/s

8,000 MT/s
MSI Pro B840M B supports memory speeds up to 8000 MT/s, which is higher than that of 85% of motherboards and equal to that of 5.6% of motherboards.
Show more
N. of M.2 sockets
What it is: The number of M.2 slots available on the motherboard.
When it matters: When you want room for more NVMe or M.2 drives.

Importance: HIGH

Good value: >=3

2
MSI Pro B840M B has 2 M.2 sockets, which is more than 30.8% of motherboards and equal to 34.6% of motherboards.
M.2 slot interface per slot
What it is: The storage or PCIe interface available for each M.2 slot on the motherboard.
When it matters: When you want to check which drives each M.2 slot can use.

Importance: HIGH

2x PCIe 4.0 x4
MSI Pro B840M B offers 2x PCIe 4.0x4 for M.2 slot interfaces, which is faster than that of 56.3% of motherboards and equal to that of 5.2% of motherboards.
N. of SATA 3 connectors
What it is: The number of SATA 6Gb/s connectors on the motherboard.
When it matters: When you plan to connect multiple SATA drives.

Importance: MEDIUM

Good value: >=6

4
MSI Pro B840M B has 4 SATA 3 connectors, which is more than 5.6% of motherboards and equal to 46.3% of motherboards.
Supported RAID levels
What it is: The RAID modes officially supported by the motherboard storage platform.
When it matters: When you plan to use multiple drives in a RAID setup.

Importance: MEDIUM

0/1/10
MSI Pro B840M B supports RAID levels 0/1/10, which is narrower than 68.3% of motherboards and equal to 23.2% of motherboards.
NVMe RAID support
What it is: Shows whether the board supports RAID configurations that use NVMe SSDs.
When it matters: When you plan to use multiple NVMe drives in RAID.

Importance: LOW

yes
MSI Pro B840M B supports NVMe RAID. 40.3% of motherboards support this feature.
AMD RAIDXpert2 support
Show more
N. of PCIe 5.0 x16 slots
What it is: The number of PCIe 5.0 x16 physical slots on the motherboard.
When it matters: When you want the newest high-bandwidth expansion slots.

Importance: HIGH

Good value: >=1

0
MSI Pro B840M B has 0 PCIe 5.0x16 slots, which is equal to 68.5% of motherboards.
N. of PCIe 4.0 x16 slots
What it is: The number of PCIe 4.0 x16 physical slots on the motherboard.
When it matters: When you want more room for modern expansion cards.

Importance: HIGH

Good value: >=1

1
MSI Pro B840M B has 1 PCIe 4.0x16 slots, which is more than 55.6% of motherboards and equal to 35.3% of motherboards.
N. of PCIe 3.0 x16 slots
What it is: The number of PCIe 3.0 x16 physical slots on the motherboard.
When it matters: When you need more full-length expansion slots.

Importance: MEDIUM

0
MSI Pro B840M B has 0 PCIe 3.0x16 slots, which is fewer than 59.5% of motherboards and equal to 40.5% of motherboards.
runs at x1 mode
PCIe slot electrical configuration
What it is: The actual lane wiring used by the motherboard PCIe slots.
When it matters: When you need to know how much bandwidth each slot really gets.

Importance: HIGH

x16/x1
MSI Pro B840M B uses x16/x1 for PCIe slot electrical configuration, which is less flexible than that of 70.9% of motherboards and equal to that of 7.2% of motherboards.
PCIe bifurcation support
What it is: Shows whether the board can split PCIe lanes across multiple devices from one slot or link.
When it matters: When you plan multi-SSD adapters or more advanced expansion setups.

Importance: MEDIUM

no
MSI Pro B840M B does not support PCIe bifurcation. 61% of motherboards support this feature.
Show more
Total USB ports (rear I/O)
What it is: The total number of rear USB ports available on the motherboard.
When it matters: When you use many USB devices directly from the back of the PC.

Importance: MEDIUM

Good value: >=8

6
MSI Pro B840M B has 6 USB ports (rear I/O), which is fewer than 64.2% of motherboards and equal to 32.9% of motherboards.
Total USB ports (including headers)
What it is: The total number of USB ports supported when rear ports and internal headers are counted together.
When it matters: When you want to know the board's full USB expansion potential.

Importance: MEDIUM

Good value: >=14

13
MSI Pro B840M B has 13 USB ports (including headers), which is fewer than 64.7% of motherboards and equal to 7.6% of motherboards.
Total USB-C ports (rear I/O)
What it is: The total number of rear USB-C ports on the motherboard.
When it matters: When you want more USB-C devices connected without adapters.

Importance: MEDIUM

Good value: >=1

0
MSI Pro B840M B has 0 USB-C ports (rear I/O), which is fewer than 64.6% of motherboards and equal to 35.4% of motherboards.
Total USB-C ports (including headers)
What it is: The total number of USB-C ports supported when rear ports and internal headers are counted together.
When it matters: When you want more USB-C connectivity across the whole build.

Importance: MEDIUM

Good value: >=2

1
MSI Pro B840M B has 1 USB-C ports (including headers), which is more than 30.5% of motherboards and equal to 21.3% of motherboards.
N. of USB 3.2 Gen2x2 ports (USB-C)
What it is: The number of rear USB 3.2 Gen2x2 Type-C ports on the motherboard.
When it matters: When you want very fast USB-C connectivity on the rear I/O.

Importance: HIGH

Good value: >=1

0
MSI Pro B840M B has 0 USB 3.2 Gen2x2 ports (USB-C), which is equal to 81.6% of motherboards.
10Gbps excluded.
Show more
LAN speed
What it is: The maximum wired Ethernet speed supported by the motherboard.
When it matters: When you want faster wired networking.

Importance: HIGH

Good value: 2.5GbE

2.5 Gbps
MSI Pro B840M B supports LAN speeds up to 2.5 Gbps, which is higher than that of 49.2% of motherboards and equal to that of 41.5% of motherboards.
LAN controller
What it is: The model of onboard Ethernet controller used by the motherboard.
When it matters: When you compare networking hardware quality and features.

Importance: MEDIUM

?
N. of RJ45 ports
What it is: The number of wired Ethernet ports on the motherboard.
When it matters: When you need one or more wired network connections.

Importance: LOW

1
MSI Pro B840M B has 1 RJ45 ports, which is equal to 85.6% of motherboards.
Wi-Fi connectivity
What it is: Shows whether the motherboard includes onboard Wi-Fi hardware instead of requiring a separate adapter.
When it matters: When you want wireless networking without adding an extra card.

Importance: MEDIUM

no
MSI Pro B840M B does not support Wi-Fi connectivity. 49.1% of motherboards support this feature.
Wi-Fi version
What it is: The supported Wi-Fi generation, such as Wi-Fi 6 or Wi-Fi 7.
When it matters: When you care about wireless speed and router compatibility.

Importance: MEDIUM

Good value: Wi-Fi 6E (802.11ax)

N/A
Show more
Audio codec
What it is: The onboard audio codec used by the motherboard.
When it matters: When sound quality from the built-in audio matters to you.

Importance: MEDIUM

Realtek ALC897
MSI Pro B840M B uses the Realtek ALC897 audio codec, which is less advanced than that of 50.8% of motherboards and equal to that of 29.3% of motherboards.
Audio channels
What it is: The audio channel configuration supported by the onboard sound solution.
When it matters: When you want surround sound from the motherboard audio outputs.

Importance: LOW

Good value: 7.1

7.1
MSI Pro B840M B offers 7.1 audio channels, which is more than 4.9% of motherboards and equal to 95.1% of motherboards.
Audio SNR
What it is: The signal-to-noise ratio of the onboard audio solution.
When it matters: When you care about cleaner onboard audio output.

Importance: MEDIUM

Good value: >=120 dB

?
Headphone amp support
What it is: Shows whether the onboard audio path includes dedicated headphone amplification for harder-to-drive headsets.
When it matters: When you use harder-to-drive headphones from the onboard audio.

Importance: LOW

yes
MSI Pro B840M B supports a headphone amp. 37% of motherboards support this feature.
N. of 3.5mm audio jacks
What it is: The number of rear 3.5mm audio jacks on the motherboard.
When it matters: When you want more analog audio connection options.

Importance: LOW

Good value: >=5

3
MSI Pro B840M B has 3 3.5mm audio jacks, which is fewer than 50.3% of motherboards and equal to 38.2% of motherboards.
Show more
VRM phases
What it is: The number of power-delivery phases used by the motherboard VRM.
When it matters: When you care about CPU power delivery and overclocking headroom.

Importance: HIGH

Good value: >=12

7+2+1
MSI Pro B840M B has 7+2+1 VRM phases, which is fewer than 63.7% of motherboards and equal to 0.4% of motherboards.
N. of CPU power connectors
What it is: The number of CPU power connectors on the motherboard.
When it matters: When you care about power delivery for higher-end CPUs.

Importance: HIGH

Good value: >=2

1
MSI Pro B840M B has 1 CPU power connectors, which is equal to 54.5% of motherboards.
N. of fan headers
What it is: The number of headers available for case or CPU fans.
When it matters: When your build uses several fans.

Importance: MEDIUM

Good value: >=6

3
MSI Pro B840M B has 3 fan headers, which is fewer than 76.7% of motherboards and equal to 15% of motherboards.
Pump header
What it is: Shows whether the motherboard includes a dedicated header designed for a liquid-cooling pump.
When it matters: When you build with an AIO or custom liquid cooling loop.

Importance: MEDIUM

yes
MSI Pro B840M B has a pump header. 23.1% of motherboards include this feature.
Pump header max current
What it is: The maximum current the dedicated pump header can supply.
When it matters: When you want to make sure the pump header can power your cooling setup.

Importance: LOW

Good value: >=2 A

?
Show more

MSI Pro B840M B vs the average motherboard

  • Newer CPU socket
    MSI Pro B840M B has newer CPU socket than the average motherboard (AM5 vs LGA 1,151). The average motherboard uses LGA 1,151 CPU socket.
    What it is: The socket type the motherboard is built to support.
    When it matters: When you need the motherboard to match a specific CPU.

    Importance: HIGH

    MSI Pro B840M B has newer CPU socket than the average motherboard (AM5 vs LGA 1,151). The average motherboard uses LGA 1,151 CPU socket.AM5 vs LGA 1151
  • Newer DDR memory generation
    MSI Pro B840M B has newer DDR memory generation than the average motherboard (DDR5 vs DDR4). The average motherboard supports DDR4 memory.
    What it is: The RAM generation the motherboard supports, such as DDR4 or DDR5.
    When it matters: When you need the board to match a certain memory platform.

    Importance: HIGH

    Good value: DDR5

    MSI Pro B840M B has newer DDR memory generation than the average motherboard (DDR5 vs DDR4). The average motherboard supports DDR4 memory.DDR5 vs DDR4
  • 1 more PCIe 4.0x16 slots
    MSI Pro B840M B has more PCIe 4.0x16 slots than the average motherboard (1 vs 0). The average motherboard has 0 PCIe 4.0x16 slot/s.
    What it is: The number of PCIe 4.0 x16 physical slots on the motherboard.
    When it matters: When you want more room for modern expansion cards.

    Importance: HIGH

    Good value: >=1

    MSI Pro B840M B has more PCIe 4.0x16 slots than the average motherboard (1 vs 0). The average motherboard has 0 PCIe 4.0x16 slot/s.1 vs 0
  • 73.9% higher maximum RAM speed
    MSI Pro B840M B has a higher maximum RAM speed than the average motherboard (8,000 MT/s vs 4,600 MT/s). The average motherboard supports RAM speed of 4,600 MT/s.
    What it is: The highest officially supported memory speed for the motherboard.
    When it matters: When you choose RAM and want to know the supported speed ceiling.

    Importance: HIGH

    Good value: >=6400 MT/s

    MSI Pro B840M B has a higher maximum RAM speed than the average motherboard (8,000 MT/s vs 4,600 MT/s). The average motherboard supports RAM speed of 4,600 MT/s.8000 MT/s vs 4600 MT/s
  • 1 more USB 3.2 Gen1 headers
    MSI Pro B840M B has more USB 3.2 Gen1 headers than the average motherboard (2 vs 1). The average motherboard has 1 USB 3.2 Gen1 header/s.
    two internal headers
    What it is: The number of internal USB 3.2 Gen1 headers for front-panel Type-A ports.
    When it matters: When your case has front USB-A ports to connect.

    Importance: MEDIUM

    Good value: >=1

    MSI Pro B840M B has more USB 3.2 Gen1 headers than the average motherboard (2 vs 1). The average motherboard has 1 USB 3.2 Gen1 header/s.2 vs 1
  • Rear-panel CMOS reset button
    MSI Pro B840M B has a rear-panel CMOS reset button, while the average motherboard does not. 26.5% of motherboards include a rear-panel CMOS reset button.
    Rear-panel Clear CMOS button.
    What it is: A rear I/O button used to clear BIOS or CMOS settings quickly.
    When it matters: When you overclock or troubleshoot and want an easier reset method.

    Importance: LOW

    MSI Pro B840M B has a rear-panel CMOS reset button, while the average motherboard does not. 26.5% of motherboards include a rear-panel CMOS reset button.
  • 1 more ARGB headers
    MSI Pro B840M B has more ARGB headers than the average motherboard (3 vs 2). The average motherboard has 2 ARGB header/s.
    What it is: The number of 3-pin addressable RGB headers available on the motherboard.
    When it matters: When you want to connect more ARGB lighting devices.

    Importance: LOW

    Good value: >=2

    MSI Pro B840M B has more ARGB headers than the average motherboard (3 vs 2). The average motherboard has 2 ARGB header/s.3 vs 2
  • 79 mm shorter
    MSI Pro B840M B is shorter than the average motherboard (226 mm vs 305 mm). The average motherboard height is 305 mm.
    What it is: The physical height of the motherboard.
    When it matters: When you check case fit or compare board size.

    Importance: LOW

    MSI Pro B840M B is shorter than the average motherboard (226 mm vs 305 mm). The average motherboard height is 305 mm.226 mm vs 305 mm
  • Newer CPU socket
    MSI Pro B840M B has newer CPU socket than the average motherboard (AM5 vs LGA 1,151). The average motherboard uses LGA 1,151 CPU socket.
  • Rear-panel CMOS reset button
    MSI Pro B840M B has a rear-panel CMOS reset button, while the average motherboard does not. 26.5% of motherboards include a rear-panel CMOS reset button.
  • 4 newer release date
    MSI Pro B840M B has a newer release date than the average motherboard (2,025 vs 2,021). The average motherboard was released in 2,021.
  • Newer DDR memory generation
    MSI Pro B840M B has newer DDR memory generation than the average motherboard (DDR5 vs DDR4). The average motherboard supports DDR4 memory.
  • 73.9% higher maximum RAM speed
    MSI Pro B840M B has a higher maximum RAM speed than the average motherboard (8,000 MT/s vs 4,600 MT/s). The average motherboard supports RAM speed of 4,600 MT/s.
  • 62.2% higher overclocked RAM speed
    MSI Pro B840M B has a higher overclocked RAM speed than the average motherboard (8,000 MT/s vs 4,933 MT/s). The average motherboard supports overclocked RAM speed of 4,933 MT/s.
  • 1 more PCIe 4.0x16 slots
    MSI Pro B840M B has more PCIe 4.0x16 slots than the average motherboard (1 vs 0). The average motherboard has 0 PCIe 4.0x16 slot/s.
  • 1 more USB 3.2 Gen1 headers
    MSI Pro B840M B has more USB 3.2 Gen1 headers than the average motherboard (2 vs 1). The average motherboard has 1 USB 3.2 Gen1 header/s.
  • Includes VGA connector
    MSI Pro B840M B has a VGA connector, while the average motherboard does not. 22% of motherboards include a VGA connector.
  • 1 more ARGB headers
    MSI Pro B840M B has more ARGB headers than the average motherboard (3 vs 2). The average motherboard has 2 ARGB header/s.
  • 79 mm shorter
    MSI Pro B840M B is shorter than the average motherboard (226 mm vs 305 mm). The average motherboard height is 305 mm.

Total
Overall
Platform & Features
Memory
Expansion
Ports & USB
Power & Cooling
  • Less versatile form factor
    MSI Pro B840M B has less versatile form factor than the average motherboard (microATX vs ATX). The average motherboard comes in ATX form factor.
  • More basic motherboard chipset
    MSI Pro B840M B has more basic motherboard chipset than the average motherboard (AMD B840 vs Intel B860). The average motherboard uses Intel B860 chipset.
  • Narrower Windows support
    MSI Pro B840M B has narrower Windows support than the average motherboard (Windows 11 vs Windows 11, Windows 10). The average motherboard supports Windows 11, Windows 10.
  • 2 fewer memory slots
    MSI Pro B840M B has fewer memory slots than the average motherboard (2 vs 4). The average motherboard has 4 memory slot/s.
  • Slower M.2 slot interfaces
    MSI Pro B840M B has slower M.2 slot interfaces than the average motherboard (2x PCIe 4.0x4 vs 1x PCIe 5.0x4, 2x PCIe 4.0x4). The average motherboard uses 1x PCIe 5.0x4, 2x PCIe 4.0x4 M.2 slot interfaces.
  • Fewer RAID options
    MSI Pro B840M B has fewer RAID options than the average motherboard (0/1/10 vs 0/1/5/10). The average motherboard has 0/1/5/10 RAID level/s.
  • No PCIe bifurcation support
    MSI Pro B840M B does not support PCIe bifurcation, while the average motherboard does. 61% of motherboards support PCIe bifurcation.
  • No multi-GPU support
    MSI Pro B840M B does not support multi-GPU, while the average motherboard does. 54.6% of motherboards support multi-GPU.
  • 1 fewer PCIe 3.0x16 slots
    MSI Pro B840M B has fewer PCIe 3.0x16 slots than the average motherboard (0 vs 1). The average motherboard has 1 PCIe 3.0x16 slot/s.
    runs at x1 mode
  • 2 fewer rear USB ports
    MSI Pro B840M B has fewer rear USB ports than the average motherboard (6 vs 8). The average motherboard has 8 rear USB port/s.
  • 1 fewer rear USB-C ports
    MSI Pro B840M B has fewer rear USB-C ports than the average motherboard (0 vs 1). The average motherboard has 1 rear USB-C port/s.
  • 1 fewer USB 3.2 Gen2 ports
    MSI Pro B840M B has fewer USB 3.2 Gen2 ports than the average motherboard (0 vs 1). The average motherboard has 1 USB 3.2 Gen2 port/s.
  • 2 fewer total USB connections
    MSI Pro B840M B has fewer total USB connections than the average motherboard (13 vs 15). The average motherboard has 15 total USB connections.
  • 1 fewer DisplayPort outputs
    MSI Pro B840M B has fewer DisplayPort outputs than the average motherboard (0 vs 1). The average motherboard has 1 DisplayPort outputs.
    other video outputs only
  • 1 fewer PS/2 ports
    MSI Pro B840M B has fewer PS/2 ports than the average motherboard (0 vs 1). The average motherboard has 1 PS/2 port/s.
  • No Wi-Fi antenna included
    MSI Pro B840M B does not include a Wi-Fi antenna, while the average motherboard does. 51.1% of motherboards include a Wi-Fi antenna.
  • More basic audio codec
    MSI Pro B840M B has more basic audio codec than the average motherboard (Realtek ALC897 vs Realtek ALC898). The average motherboard uses Realtek ALC898 audio codec.
  • 2 fewer 3.5mm audio jacks
    MSI Pro B840M B has fewer 3.5mm audio jacks than the average motherboard (3 vs 5). The average motherboard has 5 3.5mm audio jacks.
  • No optical S/PDIF out
    MSI Pro B840M B does not have optical S/PDIF out, while the average motherboard does. 55.7% of motherboards include optical S/PDIF out.
  • 2 fewer fan headers
    MSI Pro B840M B has fewer fan headers than the average motherboard (3 vs 5). The average motherboard has 5 fan header/s.
  • No onboard RGB lighting
    MSI Pro B840M B does not have onboard RGB lighting, while the average motherboard does. 50.3% of motherboards include onboard RGB lighting.
  • Fewer VRM phases
    MSI Pro B840M B has fewer VRM phases than the average motherboard (7+2+1 vs 10). The average motherboard has 10 VRM phase/s.
  • 2 fewer memory slots
    MSI Pro B840M B has fewer memory slots than the average motherboard (2 vs 4). The average motherboard has 4 memory slot/s.
    What it is: The number of RAM slots on the motherboard.
    When it matters: When you want more room for future memory upgrades.

    Importance: HIGH

    Good value: >=4

    MSI Pro B840M B has fewer memory slots than the average motherboard (2 vs 4). The average motherboard has 4 memory slot/s.2 vs 4
  • 2 fewer rear USB ports
    MSI Pro B840M B has fewer rear USB ports than the average motherboard (6 vs 8). The average motherboard has 8 rear USB port/s.
    What it is: The total number of rear USB ports available on the motherboard.
    When it matters: When you use many USB devices directly from the back of the PC.

    Importance: MEDIUM

    Good value: >=8

    MSI Pro B840M B has fewer rear USB ports than the average motherboard (6 vs 8). The average motherboard has 8 rear USB port/s.6 vs 8
  • Slower M.2 slot interfaces
    MSI Pro B840M B has slower M.2 slot interfaces than the average motherboard (2x PCIe 4.0x4 vs 1x PCIe 5.0x4, 2x PCIe 4.0x4). The average motherboard uses 1x PCIe 5.0x4, 2x PCIe 4.0x4 M.2 slot interfaces.
    What it is: The storage or PCIe interface available for each M.2 slot on the motherboard.
    When it matters: When you want to check which drives each M.2 slot can use.

    Importance: HIGH

    MSI Pro B840M B has slower M.2 slot interfaces than the average motherboard (2x PCIe 4.0x4 vs 1x PCIe 5.0x4, 2x PCIe 4.0x4). The average motherboard uses 1x PCIe 5.0x4, 2x PCIe 4.0x4 M.2 slot interfaces.2x PCIe 4.0x4 vs 1x PCIe 5.0x4, 2x PCIe 4.0x4
  • No PCIe bifurcation support
    MSI Pro B840M B does not support PCIe bifurcation, while the average motherboard does. 61% of motherboards support PCIe bifurcation.
    What it is: Shows whether the board can split PCIe lanes across multiple devices from one slot or link.
    When it matters: When you plan multi-SSD adapters or more advanced expansion setups.

    Importance: MEDIUM

    MSI Pro B840M B does not support PCIe bifurcation, while the average motherboard does. 61% of motherboards support PCIe bifurcation.
  • 1 fewer rear USB-C ports
    MSI Pro B840M B has fewer rear USB-C ports than the average motherboard (0 vs 1). The average motherboard has 1 rear USB-C port/s.
    What it is: The total number of rear USB-C ports on the motherboard.
    When it matters: When you want more USB-C devices connected without adapters.

    Importance: MEDIUM

    Good value: >=1

    MSI Pro B840M B has fewer rear USB-C ports than the average motherboard (0 vs 1). The average motherboard has 1 rear USB-C port/s.0 vs 1
  • No Wi-Fi antenna included
    MSI Pro B840M B does not include a Wi-Fi antenna, while the average motherboard does. 51.1% of motherboards include a Wi-Fi antenna.
    What it is: Shows whether the external Wi-Fi antenna is included with the motherboard package.
    When it matters: When the board has Wi-Fi and you want it ready to use right away.

    Importance: LOW

    MSI Pro B840M B does not include a Wi-Fi antenna, while the average motherboard does. 51.1% of motherboards include a Wi-Fi antenna.
  • Fewer RAID options
    MSI Pro B840M B has fewer RAID options than the average motherboard (0/1/10 vs 0/1/5/10). The average motherboard has 0/1/5/10 RAID level/s.
    What it is: The RAID modes officially supported by the motherboard storage platform.
    When it matters: When you plan to use multiple drives in a RAID setup.

    Importance: MEDIUM

    MSI Pro B840M B has fewer RAID options than the average motherboard (0/1/10 vs 0/1/5/10). The average motherboard has 0/1/5/10 RAID level/s.0/1/10 vs 0/1/5/10
  • 1 fewer USB 3.2 Gen2 ports
    MSI Pro B840M B has fewer USB 3.2 Gen2 ports than the average motherboard (0 vs 1). The average motherboard has 1 USB 3.2 Gen2 port/s.
    What it is: The number of rear USB 3.2 Gen2 Type-A ports on the motherboard.
    When it matters: When you want faster USB-A ports for storage or accessories.

    Importance: MEDIUM

    Good value: >=2

    MSI Pro B840M B has fewer USB 3.2 Gen2 ports than the average motherboard (0 vs 1). The average motherboard has 1 USB 3.2 Gen2 port/s.0 vs 1
Total
Overall
Platform & Features
Memory
Storage
Expansion
Ports & USB
Network
Audio
Power & Cooling

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Third-party reviews

United Kingdom
amazon
4.2
21 Reviews
amazon
4.8
7 Reviews
United States
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4.2
21 Reviews
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4.9
7 Reviews

(Reviews last updated: May 2026)

What customers like about MSI Pro B840M B?

  • Excellent value for money, providing essential AM5 features at a highly competitive budget price point.
  • Stable and reliable performance for daily productivity and standard gaming without unexpected crashes.
  • Easy and painless BIOS updates via M-Flash, with XMP profiles loading reliably on the first attempt.
  • Decent power delivery (7-phase VRM) that handles mid-tier CPUs effectively for its class.
  • Convenient diagnostic and maintenance features including a BIOS flashback button and CMOS reset button.
  • Generous internal connectivity for a budget board, including three ARGB headers and a front-panel USB-C connector.

What customers dislike about MSI Pro B840M B?

  • Dated and cumbersome BIOS interface (Click BIOS 5) that feels less user-friendly than competitors.
  • No support for CPU overclocking or Precision Boost Overdrive (PBO), as the B840 chipset is functionally restricted like entry-level tiers.
  • Lacks integrated Wi-Fi and Bluetooth, requiring an additional adapter for wireless connectivity.
  • Limited memory expansion with only two DIMM slots, which also feature single-sided latches that can be less secure.
  • Basic rear I/O connectivity with a limited number of USB ports and a legacy VGA port that may not be useful for modern builds.
  • Minimal VRM cooling which makes it unsuitable for high-TDP CPUs or heavy sustained workloads.

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