OVERALL
ALTERNATIVES
SPECS
VS AVERAGE
REVIEWS
Scored using Motherboards Methodology v1.0
Motherboards Methodology v1.0
Mathematical & Unbiased Scoring
Products in this category are evaluated mathematically under Frontumo Motherboards Methodology v1.0 using verified laboratory benchmarks, technical specifications, and authentic consumer ratings with 0% commercial bias.
Explore Motherboards Methodology v1.0

MSI Pro B840M B Review | 107 Data compared

Avg. price:~£80CPU socket:AM5Chipset:AMD B840Form factor:microATX

MSI Pro B840M B Review: Compare 107 technical specifications and user reviews to see how this product ranks in the Motherboards category and whether it is worth buying.

6.2

Overall score

Score
6.2/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 57% of models
Score components

90%

6.1

Technical score

10%

7.7

User score

â–¼Worse than 57% of motherboards
6.1

Technical score

Technical score
6.1/ 10
✕
What it is
An assessment of technical performance for products in the Motherboards category across these key areas: Platform & Features, Memory, Storage, Expansion, Ports & USB, Network, Audio, Power & Cooling.
When it matters
When you want to compare motherboards based on technical performance and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 57% of models
Score components

19%

6.2

Memory

16%

8.7

Platform & Features

16%

6.5

Storage

15%

6.6

Network

13%

2.4

Ports & USB

8%

3.9

Expansion

8%

6.1

Power & Cooling

5%

6.8

Audio

â–¼Worse than 57% of motherboards
7.7

User score

User score
7.7/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 75% of models
Score components

70%

8.7

User ratings

30%

5.3

Number of reviews

Based on 56 buyer reviews from online shops.
Read buyer reviews on Amazon →
How we calculate this
User ratings – average star rating across all shop listings, weighted by how many reviews each has, on a 1–10 scale.
Number of reviews – how many buyer reviews the product has, on a logarithmic scale; the 8% most-reviewed models in the category get 10.
â–¼Worse than 75% of motherboards
  • msi-pro-b840m-b
  • msi-pro-b840m-b
  • msi-pro-b840m-b
  • msi-pro-b840m-b
  • msi-pro-b840m-b
  • msi-pro-b840m-b
  • msi-pro-b840m-b
msi-pro-b840m-b
msi-pro-b840m-b
msi-pro-b840m-b
msi-pro-b840m-b
msi-pro-b840m-b
msi-pro-b840m-b
msi-pro-b840m-b

Best prices

*As an Amazon Associate, we earn from qualifying purchases.

Best rankings

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

Technical Specifications of motherboard MSI Pro B840M B

Technical score
Technical score
6.1/ 10
✕
What it is
An assessment of technical performance for products in the Motherboards category across these key areas: Platform & Features, Memory, Storage, Expansion, Ports & USB, Network, Audio, Power & Cooling.
When it matters
When you want to compare motherboards based on technical performance and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 57% of models
Score components:

19%

6.2

Memory

16%

8.7

Platform & Features

16%

6.5

Storage

15%

6.6

Network

13%

2.4

Ports & USB

8%

3.9

Expansion

8%

6.1

Power & Cooling

5%

6.8

Audio

6.1
User score
User score
7.7/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 75% of models
Score components

70%

8.7

User ratings

30%

5.3

Number of reviews

Based on 56 buyer reviews from online shops.
Read buyer reviews on Amazon →
How we calculate this
User ratings – average star rating across all shop listings, weighted by how many reviews each has, on a 1–10 scale.
Number of reviews – how many buyer reviews the product has, on a logarithmic scale; the 8% most-reviewed models in the category get 10.
7.7
Popularity
Popularity
5.3/ 10
✕
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.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 61% of models
Popularity:
MSI Pro B840M B has a popularity score of 5.3 points, which is lower than that of 59.8% of products in this category.
5.3
Value for money
Value for money
7.4/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 52% of models
Score components:

60%

6.2

Overall score

40%

10

Price

7.4
Brand name
MSI
CPU socket
AM5
CPU socket
AM5
â–² Better than 86% of models
This motherboard 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
AMD
CPU platform
AMD
â–¼ Worse than 68% of models
This motherboard is built for the AMD CPU platform, which is less common than that of 68.5% of motherboards and equal to that of 31.5% of motherboards.
Chipset
AMD B840
Chipset
AMD B840
â–² Better than 84% of models
This motherboard uses the AMD B840 chipset, which is more advanced than that of 83.8% of motherboards and equal to that of 0.5% of motherboards.
Form factor
microATX
Form factor
microATX
â–¼ Worse than 52% of models
This motherboard 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.
Show more
DDR memory version
DDR5
DDR memory version
DDR5
â–² Better than 64% of models
This motherboard uses DDR5 memory, which is newer than that of 64.3% of motherboards and equal to that of 35.7% of motherboards.
Memory slots
2
Memory slots
2
â–¼ Worse than 79% of models
Market range: <2 – >4
This motherboard has 2 Memory slots, which is fewer than 78.6% of motherboards and equal to 21.4% of motherboards.
Maximum memory capacity
128 GB
Maximum memory capacity
128 GB
â–² Better than 40% of models
Market range: <32 GB – >256 GB
This motherboard supports up to 128 GB of memory, which is more than 40.4% of motherboards and equal to 31.9% of motherboards.
Memory channels
2
Memory channels
2
â–¼ Worse than 7% of models
This motherboard supports 2 memory channels, which is more than 0.2% of motherboards and equal to 92.6% of motherboards.
Maximum RAM speed
8,000 MT/s
Maximum RAM speed
8,000 MT/s
â–² Better than 85% of models
Market range: <2k MT/s – >8k MT/s
This motherboard supports memory speeds up to 8,000 MT/s, which is higher than that of 85% of motherboards and equal to that of 5.7% of motherboards.
Show more
N. of M.2 sockets
2
N. of M.2 sockets
2
â–¼ Worse than 35% of models
Market range: <0 – >4
This motherboard has 2 M.2 sockets, which is more than 30.8% of motherboards and equal to 34.4% of motherboards.
M.2 slot interface per slot
2x PCIe 4.0 x4
M.2 slot interface per slot
2x PCIe 4.0 x4
â–² Better than 56% of models
This motherboard offers 2x PCIe 4.0x4 for M.2 slot interfaces, which is faster than that of 55.9% of motherboards and equal to that of 5.3% of motherboards.
N. of SATA 3 connectors
4
N. of SATA 3 connectors
4
â–¼ Worse than 48% of models
Market range: <4 – >8
This motherboard has 4 SATA 3 connectors, which is more than 5.6% of motherboards and equal to 46.2% of motherboards.
Supported RAID levels
0/1/10
Supported RAID levels
0/1/10
â–¼ Worse than 68% of models
This motherboard supports RAID levels 0/1/10, which is narrower than 68.1% of motherboards and equal to 23.3% of motherboards.
NVMe RAID support
yes
NVMe RAID support
yes
â–² Better than 40% of models
This motherboard supports NVMe RAID. 40.3% of motherboards support this feature.
AMD RAIDXpert2 support
Show more
N. of PCIe 5.0 x16 slots
0
N. of PCIe 5.0 x16 slots
0
â–¼ Worse than 31% of models
Market range: <0 – >1
This motherboard has 0 PCIe 5.0x16 slots, which is fewer than 31.5% of motherboards and equal to 68.5% of motherboards.
N. of PCIe 4.0 x16 slots
1
N. of PCIe 4.0 x16 slots
1
â–² Better than 56% of models
Market range: <0 – >1
This motherboard has 1 PCIe 4.0x16 slots, which is more than 55.5% of motherboards and equal to 35.4% of motherboards.
N. of PCIe 3.0 x16 slots
0
N. of PCIe 3.0 x16 slots
0
â–¼ Worse than 60% of models
Market range: <0 – >3
This motherboard has 0 PCIe 3.0x16 slots, which is fewer than 59.6% of motherboards and equal to 40.4% of motherboards.
runs at x1 mode
PCIe slot electrical configuration
x16/x1
PCIe slot electrical configuration
x16/x1
â–¼ Worse than 66% of models
This motherboard uses x16/x1 for PCIe slot electrical configuration, which is less flexible than that of 66.3% of motherboards and equal to that of 4.9% of motherboards.
PCIe bifurcation support
no
PCIe bifurcation support
no
â–¼ Worse than 60% of models
This motherboard does not support PCIe bifurcation. 59.7% of motherboards support this feature.
Show more
Total USB ports (rear I/O)
6
Total USB ports (rear I/O)
6
â–¼ Worse than 64% of models
Market range: <6 – >10
This motherboard has 6 USB ports (rear I/O), which is fewer than 64.3% of motherboards and equal to 32.7% of motherboards.
Total USB ports (including headers)
13
Total USB ports (including headers)
13
â–¼ Worse than 65% of models
Market range: <11 – >19
This motherboard has 13 USB ports (including headers), which is fewer than 65% of motherboards and equal to 7.6% of motherboards.
Total USB-C ports (rear I/O)
0
Total USB-C ports (rear I/O)
0
â–¼ Worse than 65% of models
Market range: <0 – >2
This motherboard 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)
1
Total USB-C ports (including headers)
1
â–¼ Worse than 48% of models
Market range: <0 – >3
This motherboard has 1 USB-C ports (including headers), which is more than 30.4% of motherboards and equal to 21.3% of motherboards.
N. of USB 3.2 Gen2x2 ports (USB-C)
0
N. of USB 3.2 Gen2x2 ports (USB-C)
0
â–¼ Worse than 18% of models
Market range: <0 – >1
This motherboard has 0 USB 3.2 Gen2x2 ports (USB-C), which is fewer than 18.3% of motherboards and equal to 81.7% of motherboards.
10Gbps excluded.
Show more
LAN speed
2.5 Gbps
LAN speed
2.5 Gbps
â–² Better than 49% of models
Market range: <1 Gbps – >2.5 Gbps
This motherboard supports LAN speeds up to 2.5 Gbps, which is higher than that of 49.3% of motherboards and equal to that of 41.4% of motherboards.
LAN controller
Killer + Intel + Realtek
LAN controller
Killer + Intel + Realtek
â–¼ Worse than 65% of models
This motherboard uses the Killer + Intel + Realtek LAN controller, which is less advanced than that of 64.6% of motherboards and equal to that of 28.7% of motherboards.
N. of RJ45 ports
1
N. of RJ45 ports
1
â–¼ Worse than 14% of models
Market range: <1 – >2
This motherboard has 1 RJ45 ports, which is fewer than 14.4% of motherboards and equal to 85.6% of motherboards.
Wi-Fi connectivity
no
Wi-Fi connectivity
no
â–¼ Worse than 50% of models
This motherboard does not support Wi-Fi connectivity. 50.1% of motherboards support this feature.
Wi-Fi version
N/A
Show more
Audio codec
Realtek ALC897
Audio codec
Realtek ALC897
â–¼ Worse than 50% of models
This motherboard uses the Realtek ALC897 audio codec, which is less advanced than that of 50.3% of motherboards and equal to that of 29.2% of motherboards.
Audio channels
7.1
Audio channels
7.1
â–² Better than 5% of models
This motherboard offers 7.1 audio channels, which is more than 4.9% of motherboards and equal to 95.1% of motherboards.
Audio SNR
97 dB
Audio SNR
97 dB
â–¼ Worse than 65% of models
Market range: <95 dB – >120 dB
This motherboard has an audio SNR of 97 dB, which is lower than that of 65.4% of motherboards and equal to that of 17% of motherboards.
Headphone amp support
yes
Headphone amp support
yes
â–² Better than 41% of models
This motherboard supports a headphone amp. 40.8% of motherboards support this feature.
N. of 3.5mm audio jacks
3
N. of 3.5mm audio jacks
3
â–¼ Worse than 50% of models
Market range: <2 – >6
This motherboard has 3 3.5mm audio jacks, which is fewer than 50.4% of motherboards and equal to 38.1% of motherboards.
Show more
VRM phases
7+2+1
VRM phases
7+2+1
â–¼ Worse than 62% of models
This motherboard has 7+2+1 VRM phases, which is fewer than 61.9% of motherboards and equal to 0.5% of motherboards.
N. of CPU power connectors
1
N. of CPU power connectors
1
â–¼ Worse than 45% of models
Market range: <1 – >2
This motherboard has 1 CPU power connectors, which is fewer than 45.5% of motherboards and equal to 54.5% of motherboards.
N. of fan headers
3
N. of fan headers
3
â–¼ Worse than 77% of models
Market range: <3 – >8
This motherboard has 3 fan headers, which is fewer than 77.1% of motherboards and equal to 14.8% of motherboards.
Pump header
yes
Pump header
yes
â–² Better than 22% of models
This motherboard has a pump header. 21.9% of motherboards include this feature.
Pump header max current
1 A
Pump header max current
1 A
â–¼ Worse than 56% of models
Market range: <0 A – >3 A
This motherboard supports up to 1 A on the pump header, which is lower than that of 56.3% of motherboards and equal to that of 19.7% of motherboards.
Show more

MSI Pro B840M B vs the average motherboard

246810TotalPlatform & FeaturesMemoryStorageExpansionPorts & USBNetworkAudioPower & Cooling
  • Newer CPU socket
    CPU socket
    AM5
    â–² Better than 86% of models
    This motherboard has newer CPU socket than the average motherboard (AM5 vs LGA 1151). The average motherboard uses LGA 1151 CPU socket.
    AM5 vs LGA 1,151
  • Newer DDR memory generation
    DDR memory version
    DDR5
    â–² Better than 64% of models
    This motherboard 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
    N. of PCIe 4.0 x16 slots
    1
    â–² Better than 56% of models
    Market range: <0 – >1
    This motherboard 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
  • 69% higher maximum RAM speed
    Maximum RAM speed
    8,000 MT/s
    â–² Better than 85% of models
    Market range: <2k MT/s – >8k MT/s
    This motherboard has a higher maximum RAM speed than the average motherboard (8000 MT/s vs 4733 MT/s). The average motherboard supports RAM speed of 4733 MT/s.
    8,000 MT/s vs 4,733 MT/s
  • 1 more USB 3.2 Gen1 headers
    N. of USB 3.2 Gen1 headers (USB-A)
    2
    â–² Better than 68% of models
    Market range: <1 – >2
    This motherboard 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
    2 vs 1
  • Rear-panel CMOS reset button
    Rear-panel CMOS reset button
    yes
    â–² Better than 73% of models
    This motherboard has a rear-panel CMOS reset button, while the average motherboard does not. 26.7% of motherboards include a rear-panel CMOS reset button.
    Rear-panel Clear CMOS button.
  • 1 more ARGB headers
    N. of ARGB headers (3-pin)
    3
    â–² Better than 76% of models
    Market range: <0 – >3
    This motherboard 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
    Height
    226 mm
    â–² Better than 87% of models
    Market range: <170 mm – >320 mm
    This motherboard is shorter than the average motherboard (226 mm vs 305 mm). The average motherboard height is 305 mm.
    226 mm vs 305 mm
  • 2x cheaper
    MSI Pro B840M B is cheaper than the average motherboard (£80 vs £160).
    £80 vs £160
  • Newer CPU socket
    CPU socket
    AM5
    â–² Better than 86% of models
    This motherboard has newer CPU socket than the average motherboard (AM5 vs LGA 1151). The average motherboard uses LGA 1151 CPU socket.
    AM5 vs LGA 1,151
  • Rear-panel CMOS reset button
    Rear-panel CMOS reset button
    yes
    â–² Better than 73% of models
    This motherboard has a rear-panel CMOS reset button, while the average motherboard does not. 26.7% of motherboards include a rear-panel CMOS reset button.
    Rear-panel Clear CMOS button.
  • 4 newer release date
    Release date
    2025
    ★ Better than 90% of models
    Market range: <2k – >2k
    This motherboard has a newer release date than the average motherboard (2025 vs 2021). The average motherboard was released in 2021.
    June 2025
    2025 vs 2021
  • Newer DDR memory generation
    DDR memory version
    DDR5
    â–² Better than 64% of models
    This motherboard has newer DDR memory generation than the average motherboard (DDR5 vs DDR4). The average motherboard supports DDR4 memory.
    DDR5 vs DDR4
  • 69% higher maximum RAM speed
    Maximum RAM speed
    8,000 MT/s
    â–² Better than 85% of models
    Market range: <2k MT/s – >8k MT/s
    This motherboard has a higher maximum RAM speed than the average motherboard (8000 MT/s vs 4733 MT/s). The average motherboard supports RAM speed of 4733 MT/s.
    8,000 MT/s vs 4,733 MT/s
  • 62.2% higher overclocked RAM speed
    Maximum overclocked RAM speed
    8,000 MT/s
    â–² Better than 81% of models
    Market range: <2.7k MT/s – >8.2k MT/s
    This motherboard has a higher overclocked RAM speed than the average motherboard (8000 MT/s vs 4933 MT/s). The average motherboard supports overclocked RAM speed of 4933 MT/s.
    8,000 MT/s vs 4,933 MT/s
  • 1 more PCIe 4.0x16 slots
    N. of PCIe 4.0 x16 slots
    1
    â–² Better than 56% of models
    Market range: <0 – >1
    This motherboard 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
  • 1 more USB 3.2 Gen1 headers
    N. of USB 3.2 Gen1 headers (USB-A)
    2
    â–² Better than 68% of models
    Market range: <1 – >2
    This motherboard 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
    2 vs 1
  • Includes VGA connector
    VGA connector
    yes
    â–² Better than 75% of models
    This motherboard has a VGA connector, while the average motherboard does not. 24.7% of motherboards include a VGA connector.
  • 1 more ARGB headers
    N. of ARGB headers (3-pin)
    3
    â–² Better than 76% of models
    Market range: <0 – >3
    This motherboard 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
    Height
    226 mm
    â–² Better than 87% of models
    Market range: <170 mm – >320 mm
    This motherboard is shorter than the average motherboard (226 mm vs 305 mm). The average motherboard height is 305 mm.
    226 mm vs 305 mm
  • 2 fewer memory slots
    Memory slots
    2
    â–¼ Worse than 79% of models
    Market range: <2 – >4
    This motherboard 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
    Total USB ports (rear I/O)
    6
    â–¼ Worse than 64% of models
    Market range: <6 – >10
    This motherboard 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
    M.2 slot interface per slot
    2x PCIe 4.0 x4
    â–² Better than 56% of models
    This motherboard has slower M.2 slot interfaces than the average motherboard (2x PCIe 4x4 vs 1x PCIe 5x4, 2x PCIe 4x4). 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
  • 1 fewer rear USB-C ports
    Total USB-C ports (rear I/O)
    0
    â–¼ Worse than 65% of models
    Market range: <0 – >2
    This motherboard 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 connectivity
    Wi-Fi connectivity
    no
    â–¼ Worse than 50% of models
    This motherboard does not support Wi-Fi connectivity, while the average motherboard does. 50% of motherboards support Wi-Fi connectivity.
  • No Wi-Fi antenna included
    Wi-Fi antenna included
    no
    â–¼ Worse than 51% of models
    This motherboard does not include a Wi-Fi antenna, while the average motherboard does. 51.1% of motherboards include a Wi-Fi antenna.
  • No PCIe bifurcation support
    PCIe bifurcation support
    no
    â–¼ Worse than 60% of models
    This motherboard does not support PCIe bifurcation, while the average motherboard does. 59.7% of motherboards support PCIe bifurcation.
  • Fewer RAID options
    Supported RAID levels
    0/1/10
    â–¼ Worse than 68% of models
    This motherboard 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
  • 4.1% lower user score
    User score
    7.7/ 10
    ✕
    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 distribution
    ▼▼
    <55-66-77-88-99-10
    MSI Pro B840M B
    the average motherboard
    MSI Pro B840M B has a lower user score than the average motherboard (7.69 vs 8.000).
    7.69 vs 8
  • Fewer useful accessories
    Included accessories
    SATA cables, I/O shield, M.2 kit
    â–¼ Worse than 78% of models
    This motherboard has fewer useful accessories than the average motherboard (SATA cables, I/O shield, M.2 kit vs 2x SATA cables, Wi-Fi antenna, M.2 kit, front-panel adapter, RGB cable). The average motherboard comes with 2x SATA cables, Wi-Fi antenna, M.2 kit, front-panel adapter, RGB cable.
    SATA cables, I/O shield, M.2 kit vs 2x SATA cables, Wi-Fi antenna, M.2 kit, front-panel adapter, RGB cable
  • Older CPU platform
    CPU platform
    AMD
    â–¼ Worse than 68% of models
    This motherboard uses the AMD CPU platform compared to Intel on the average motherboard. The average motherboard uses Intel CPU platform.
    AMD vs Intel
  • Less versatile form factor
    Form factor
    microATX
    â–¼ Worse than 52% of models
    This motherboard has less versatile form factor than the average motherboard (microATX vs ATX). The average motherboard comes in ATX form factor.
    microATX vs ATX
  • More basic motherboard chipset
    Chipset
    AMD B840
    â–² Better than 84% of models
    This motherboard has more basic motherboard chipset than the average motherboard (AMD B840 vs Intel B860). The average motherboard uses Intel B860 chipset.
    AMD B840 vs Intel B860
  • Narrower Windows support
    Supported Windows versions
    Windows 11
    â–¼ Worse than 78% of models
    This motherboard has narrower Windows support than the average motherboard (Windows 11 vs Windows 11, Windows 10). The average motherboard supports Windows 11, Windows 10.
    Windows 11 vs Windows 11, Windows 10
  • 2 fewer memory slots
    Memory slots
    2
    â–¼ Worse than 79% of models
    Market range: <2 – >4
    This motherboard has fewer memory slots than the average motherboard (2 vs 4). The average motherboard has 4 memory slot/s.
    2 vs 4
  • Slower M.2 slot interfaces
    M.2 slot interface per slot
    2x PCIe 4.0 x4
    â–² Better than 56% of models
    This motherboard has slower M.2 slot interfaces than the average motherboard (2x PCIe 4x4 vs 1x PCIe 5x4, 2x PCIe 4x4). 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
  • Fewer RAID options
    Supported RAID levels
    0/1/10
    â–¼ Worse than 68% of models
    This motherboard 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
  • No PCIe bifurcation support
    PCIe bifurcation support
    no
    â–¼ Worse than 60% of models
    This motherboard does not support PCIe bifurcation, while the average motherboard does. 59.7% of motherboards support PCIe bifurcation.
  • No multi-GPU support
    Multi-GPU support
    no
    â–¼ Worse than 55% of models
    This motherboard does not support multi-GPU, while the average motherboard does. 54.6% of motherboards support multi-GPU.
  • Less flexible PCIe lane configuration
    PCIe slot electrical configuration
    x16/x1
    â–¼ Worse than 66% of models
    This motherboard has less flexible PCIe lane configuration than the average motherboard (x16/x1 vs x16/x0/x4, x8/x8/x4). The average motherboard uses x16/x0/x4, x8/x8/x4 PCIe slot lane configuration.
    x16/x1 vs x16/x0/x4, x8/x8/x4
  • 1 fewer PCIe 3.0x16 slots
    N. of PCIe 3.0 x16 slots
    0
    â–¼ Worse than 60% of models
    Market range: <0 – >3
    This motherboard 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
    0 vs 1
  • 2 fewer rear USB ports
    Total USB ports (rear I/O)
    6
    â–¼ Worse than 64% of models
    Market range: <6 – >10
    This motherboard has fewer rear USB ports than the average motherboard (6 vs 8). The average motherboard has 8 rear USB port/s.
    6 vs 8
  • 1 fewer rear USB-C ports
    Total USB-C ports (rear I/O)
    0
    â–¼ Worse than 65% of models
    Market range: <0 – >2
    This motherboard 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
  • 1 fewer USB 3.2 Gen2 ports
    N. of USB 3.2 Gen2 ports (USB-A)
    0
    â–¼ Worse than 63% of models
    Market range: <0 – >4
    This motherboard 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
  • 2 fewer total USB connections
    Total USB ports (including headers)
    13
    â–¼ Worse than 65% of models
    Market range: <11 – >19
    This motherboard has fewer total USB connections than the average motherboard (13 vs 15). The average motherboard has 15 total USB connections.
    13 vs 15
  • 1 fewer DisplayPort outputs
    N. of DisplayPort outputs
    0
    â–¼ Worse than 54% of models
    Market range: <0 – >1
    This motherboard has fewer DisplayPort outputs than the average motherboard (0 vs 1). The average motherboard has 1 DisplayPort outputs.
    other video outputs only
    0 vs 1
  • 1 fewer PS/2 ports
    N. of PS/2 ports
    0
    â–¼ Worse than 59% of models
    Market range: <0 – >1
    This motherboard has fewer PS/2 ports than the average motherboard (0 vs 1). The average motherboard has 1 PS/2 port/s.
    0 vs 1
  • No Wi-Fi connectivity
    Wi-Fi connectivity
    no
    â–¼ Worse than 50% of models
    This motherboard does not support Wi-Fi connectivity, while the average motherboard does. 50% of motherboards support Wi-Fi connectivity.
  • No Wi-Fi antenna included
    Wi-Fi antenna included
    no
    â–¼ Worse than 51% of models
    This motherboard does not include a Wi-Fi antenna, while the average motherboard does. 51.1% of motherboards include a Wi-Fi antenna.
  • 18 dB lower audio SNR
    Audio SNR
    97 dB
    â–¼ Worse than 65% of models
    Market range: <95 dB – >120 dB
    This motherboard has a lower audio SNR than the average motherboard (97 dB vs 115 dB). The average motherboard has audio SNR of 115 dB.
    97 dB vs 115 dB
  • 2 fewer 3.5mm audio jacks
    N. of 3.5mm audio jacks
    3
    â–¼ Worse than 50% of models
    Market range: <2 – >6
    This motherboard has fewer 3.5mm audio jacks than the average motherboard (3 vs 5). The average motherboard has 5 3.5mm audio jacks.
    3 vs 5
  • No optical S/PDIF out
    Optical S/PDIF out (TOSLINK)
    no
    â–¼ Worse than 56% of models
    This motherboard does not have optical S/PDIF out, while the average motherboard does. 55.8% of motherboards include optical S/PDIF out.
  • 2.5 fewer fan headers
    N. of fan headers
    3
    â–¼ Worse than 77% of models
    Market range: <3 – >8
    This motherboard has fewer fan headers than the average motherboard (3 vs 5.5). The average motherboard has 5.5 fan header/s.
    3 vs 5.5
  • No onboard RGB lighting
    Onboard RGB lighting
    no
    â–¼ Worse than 50% of models
    This motherboard does not have onboard RGB lighting, while the average motherboard does. 50.4% of motherboards include onboard RGB lighting.
  • 1 A lower pump header current limit
    Pump header max current
    1 A
    â–¼ Worse than 56% of models
    Market range: <0 A – >3 A
    This motherboard has a lower pump header current than the average motherboard (1 A vs 2 A). The average motherboard provides pump header current of 2 A.
    1 A vs 2 A
  • Fewer VRM phases
    VRM phases
    7+2+1
    â–¼ Worse than 62% of models
    This motherboard has fewer VRM phases than the average motherboard (7+2+1 vs 10). The average motherboard has 10 VRM phase/s.
    7+2+1 vs 10

Video reviews

Hands-on testing, unboxing, and real-world video evaluations

Third-party reviews

Based on 56 buyer reviews from online shops.
Reviews last updated: May 2026 · How we calculate this
Read buyer reviews on Amazon →

What we 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 we don't like 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.

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.

Compare MSI Pro B840M B with other products in the Motherboards category

1Product to compare no. 1
VS
2Product to compare no. 2
VS
3Product to compare no. 3 (optional)

Graphic comparison of MSI Pro B840M B and other products in the Motherboards category

No results found