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BIOSTAR B450MX S Review | 107 Data compared

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  • Avg. price in UK: ~£130
  • Avg. price in US: ~$80
  • CPU socket: AM4
  • Chipset: AMD B450
  • Form factor: microATX

BIOSTAR B450MX S review. Compare 107 technical specifications and user reviews to see how it ranks among motherboards and if it is worth buying.

5.1

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%

4.9

Technical Score

10.0%

7.3

User score

Good
4.9

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%

6.7

Memory

16.0%

6.6

Platform & Features

16.0%

4.3

Storage

15.0%

5.5

Network

13.0%

1.8

Ports & USB

8.0%

2.2

Expansion

8.0%

3.8

Power & Cooling

5.0%

6.5

Audio

Poor
7.3

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%

9.6

User reviews

30.0%

2.1

Popularity

User score:
United Kingdom
amazon
4.8
(11)
United States
Amazon_logo.png
4.8
(11)

(Reviews last updated: May 2026)

Very good
  • 3.4
    Gaming

    Score components:

    28.0%

    4.5

    VRM phases

    22.0%

    3.3

    N. of M.2 sockets

    18.0%

    4.6

    LAN speed

    17.0%

    2.5

    Maximum RAM speed

    15.0%

    1.0

    N. of PCIe 5.0 x16 slots

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Best prices in UK

Best rankings

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

Verdict

The Biostar B450MX-S is a Micro ATX motherboard based on the AMD B450 chipset, supporting AM4 socket processors including 1st, 2nd, and 3rd Gen Ryzen CPUs. Key specifications include four DIMM slots for up to 128GB of DDR4 memory with overclocking speeds up to 4333MHz, a PCIe 3.0 x16 slot, and a high-speed M.2 slot (32Gb/s) for NVMe SSDs. Its main pros are the budget-friendly price point, versatile 4-slot memory capacity which is rare in entry-level boards, and a comprehensive rear I/O featuring HDMI 4K support and USB 3.2 Gen1 ports. However, notable cons include a lack of modern USB Type-C ports, the absence of PCIe 4.0 support, and limited fan headers for advanced cooling setups.

Technical Specifications of BIOSTAR B450MX S

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%

6.7

Memory

16.0%

6.6

Platform & Features

16.0%

4.3

Storage

15.0%

5.5

Network

13.0%

1.8

Ports & USB

8.0%

2.2

Expansion

8.0%

3.8

Power & Cooling

5.0%

6.5

Audio

4.9
BIOSTAR B450MX S has a technical score of 4.89 points, which is lower than that of 81.6% 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%

9.6

User reviews

30.0%

2.1

Popularity

User score:
United Kingdom
amazon
4.8
(11)
United States
Amazon_logo.png
4.8
(11)

(Reviews last updated: May 2026)

7.3
BIOSTAR B450MX S has a user score of 7.35 points, which is lower than that of 68% 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.
2.1
BIOSTAR B450MX S has a popularity of 2.1 points, which is lower than 68.7% 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%

5.1

Overall score

40.0%

9.8

Price

6.5
BIOSTAR B450MX S has a quality-to-price ratio of 6.5 points, which is lower than 79.3% 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

Biostar
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

AM4
BIOSTAR B450MX S uses the AM4 CPU socket, which is more advanced than that of 38.5% of motherboards and equal to that of 13.3% 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 B450
BIOSTAR B450MX S uses the AMD B450 chipset, which is less advanced than that of 54.8% of motherboards and equal to that of 1.8% 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
BIOSTAR B450MX S 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

DDR4
BIOSTAR B450MX S uses DDR4 memory, which is newer than that of 13.6% of motherboards and equal to that of 51% 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

4
BIOSTAR B450MX S has 4 Memory slots, which is more than 21.5% of motherboards and equal to 72.5% 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
BIOSTAR B450MX S 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
BIOSTAR B450MX S 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

2,667 MT/s
BIOSTAR B450MX S supports memory speeds up to 2667 MT/s, which is lower than that of 77.8% of motherboards and equal to that of 1% of motherboards.
maximum depends on CPU configuration
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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

1
BIOSTAR B450MX S has 1 M.2 sockets, which is fewer than 69.2% of motherboards and equal to 19.1% 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

1x PCIe 3.0 x4/SATA
BIOSTAR B450MX S offers 1x PCIe 3.0x4/SATA for M.2 slot interfaces, which is slower than that of 73.8% of motherboards and equal to that of 10.4% 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
BIOSTAR B450MX S 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
BIOSTAR B450MX S 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

no
BIOSTAR B450MX S does not support NVMe RAID. 59.8% of motherboards support this feature.
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
BIOSTAR B450MX S 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

0
BIOSTAR B450MX S has 0 PCIe 4.0x16 slots, which is equal to 55.6% 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

1
BIOSTAR B450MX S has 1 PCIe 3.0x16 slots, which is more than 40.6% of motherboards and equal to 26.7% of motherboards.
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/x4/x1
BIOSTAR B450MX S uses x16/x4/x1 for PCIe slot electrical configuration, which is more flexible than that of 71.6% of motherboards and equal to that of 7.5% 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
BIOSTAR B450MX S 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
BIOSTAR B450MX S 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

12
BIOSTAR B450MX S has 12 USB ports (including headers), which is fewer than 72.4% of motherboards and equal to 16.6% 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
BIOSTAR B450MX S 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

0
BIOSTAR B450MX S has 0 USB-C ports (including headers), which is fewer than 69.6% of motherboards and equal to 30.4% 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
BIOSTAR B450MX S has 0 USB 3.2 Gen2x2 ports (USB-C), which is equal to 81.6% of motherboards.
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

1 Gbps
BIOSTAR B450MX S supports LAN speeds up to 1 Gbps, which is lower than that of 50.8% of motherboards and equal to that of 49.1% 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
BIOSTAR B450MX S 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
BIOSTAR B450MX S 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 ALC887
BIOSTAR B450MX S uses the Realtek ALC887 audio codec, which is less advanced than that of 89% of motherboards and equal to that of 7.9% 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
BIOSTAR B450MX S 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

95 dB
BIOSTAR B450MX S has an audio SNR of 95 dB, which is lower than that of 84.2% of motherboards and equal to that of 10.1% of motherboards.
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
BIOSTAR B450MX S 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
BIOSTAR B450MX S 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

4+2
BIOSTAR B450MX S has 4+2 VRM phases, which is fewer than 88.6% of motherboards and equal to 5.8% 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
BIOSTAR B450MX S 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
BIOSTAR B450MX S 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

no
BIOSTAR B450MX S does not have a pump header. 77% 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

0 A
BIOSTAR B450MX S supports up to 0 A on the pump header, which is lower than that of 74.3% of motherboards and equal to that of 25.7% of motherboards.
Show more

BIOSTAR B450MX S vs the average motherboard

  • More flexible PCIe lane configuration
    BIOSTAR B450MX S has more flexible PCIe lane configuration than the average motherboard (x16/x4/x1 vs x16/x1). The average motherboard uses x16/x1 PCIe slot lane 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

    BIOSTAR B450MX S has more flexible PCIe lane configuration than the average motherboard (x16/x4/x1 vs x16/x1). The average motherboard uses x16/x1 PCIe slot lane configuration.x16/x4/x1 vs x16/x1
  • 1 more PCIe 2.0x16 slots
    BIOSTAR B450MX S has more PCIe 2.0x16 slots than the average motherboard (1 vs 0). The average motherboard has 0 PCIe 2.0x16 slot/s.
    What it is: The number of PCIe 2.0 x16 physical slots on the motherboard.
    When it matters: When you compare older full-length expansion options.

    Importance: LOW

    BIOSTAR B450MX S has more PCIe 2.0x16 slots than the average motherboard (1 vs 0). The average motherboard has 0 PCIe 2.0x16 slot/s.1 vs 0
  • Newer CPU socket
    BIOSTAR B450MX S has newer CPU socket than the average motherboard (AM4 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

    BIOSTAR B450MX S has newer CPU socket than the average motherboard (AM4 vs LGA 1,151). The average motherboard uses LGA 1,151 CPU socket.AM4 vs LGA 1151
  • Includes VGA connector
    BIOSTAR B450MX S has a VGA connector, while the average motherboard does not. 22% of motherboards include a VGA connector.
    What it is: Shows whether the rear I/O includes an analog VGA display output.
    When it matters: When you need compatibility with older displays or projectors.

    Importance: LOW

    BIOSTAR B450MX S has a VGA connector, while the average motherboard does not. 22% of motherboards include a VGA connector.
  • Broader Windows support
    BIOSTAR B450MX S has broader Windows support than the average motherboard (Windows 11, Windows 10, Windows 7 vs Windows 11, Windows 10). The average motherboard supports Windows 11, Windows 10.
    What it is: The Windows versions officially supported by the motherboard.
    When it matters: When you want to know whether your planned Windows version is supported.

    Importance: MEDIUM

    BIOSTAR B450MX S has broader Windows support than the average motherboard (Windows 11, Windows 10, Windows 7 vs Windows 11, Windows 10). The average motherboard supports Windows 11, Windows 10.Windows 11, Windows 10, Windows 7 vs Windows 11, Windows 10
  • 61 mm shorter
    BIOSTAR B450MX S is shorter than the average motherboard (244 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

    BIOSTAR B450MX S is shorter than the average motherboard (244 mm vs 305 mm). The average motherboard height is 305 mm.244 mm vs 305 mm
  • Newer CPU socket
    BIOSTAR B450MX S has newer CPU socket than the average motherboard (AM4 vs LGA 1,151). The average motherboard uses LGA 1,151 CPU socket.
  • Broader Windows support
    BIOSTAR B450MX S has broader Windows support than the average motherboard (Windows 11, Windows 10, Windows 7 vs Windows 11, Windows 10). The average motherboard supports Windows 11, Windows 10.
  • More flexible PCIe lane configuration
    BIOSTAR B450MX S has more flexible PCIe lane configuration than the average motherboard (x16/x4/x1 vs x16/x1). The average motherboard uses x16/x1 PCIe slot lane configuration.
  • 1 more PCIe 2.0x16 slots
    BIOSTAR B450MX S has more PCIe 2.0x16 slots than the average motherboard (1 vs 0). The average motherboard has 0 PCIe 2.0x16 slot/s.
  • Includes VGA connector
    BIOSTAR B450MX S has a VGA connector, while the average motherboard does not. 22% of motherboards include a VGA connector.
  • 61 mm shorter
    BIOSTAR B450MX S is shorter than the average motherboard (244 mm vs 305 mm). The average motherboard height is 305 mm.

Total
Platform & Features
Expansion
Ports & USB
Power & Cooling
  • More basic motherboard chipset
    BIOSTAR B450MX S has more basic motherboard chipset than the average motherboard (AMD B450 vs Intel B860). The average motherboard uses Intel B860 chipset.
  • No BIOS flashback support
    BIOSTAR B450MX S does not support BIOS flashback, while the average motherboard does. 50.8% of motherboards support BIOS flashback.
  • No debug LED indicators
    BIOSTAR B450MX S does not have debug LED indicators, while the average motherboard does. 78.8% of motherboards include debug LED indicators.
  • Fewer BIOS update options
    BIOSTAR B450MX S has fewer BIOS update options than the average motherboard (UEFI utility, Windows app vs UEFI utility, flashback, Windows app). The average motherboard offers UEFI utility, flashback, Windows app BIOS update methods.
  • No automatic overclocking
    BIOSTAR B450MX S does not support automatic overclocking, while the average motherboard does. 74% of motherboards support automatic overclocking.
  • Less versatile form factor
    BIOSTAR B450MX S has less versatile form factor than the average motherboard (microATX vs ATX). The average motherboard comes in ATX form factor.
  • No TPM connector
    BIOSTAR B450MX S does not have a TPM connector, while the average motherboard does. 86.7% of motherboards include a TPM connector.
    Firmware TPM/PTT only.
  • 42% lower maximum RAM speed
    BIOSTAR B450MX S has a lower maximum RAM speed than the average motherboard (2,667 MT/s vs 4,600 MT/s). The average motherboard supports RAM speed of 4,600 MT/s.
    maximum depends on CPU configuration
  • Slower M.2 slot interfaces
    BIOSTAR B450MX S has slower M.2 slot interfaces than the average motherboard (1x PCIe 3.0x4/SATA 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.
  • No NVMe RAID support
    BIOSTAR B450MX S does not support NVMe RAID, while the average motherboard does. 59.8% of motherboards support NVMe RAID.
  • 1 fewer M.2 sockets
    BIOSTAR B450MX S has fewer M.2 sockets than the average motherboard (1 vs 2). The average motherboard has 2 M.2 socket/s.
  • Fewer RAID options
    BIOSTAR B450MX S 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
    BIOSTAR B450MX S does not support PCIe bifurcation, while the average motherboard does. 61% of motherboards support PCIe bifurcation.
  • No multi-GPU support
    BIOSTAR B450MX S does not support multi-GPU, while the average motherboard does. 54.6% of motherboards support multi-GPU.
  • 2 fewer rear USB ports
    BIOSTAR B450MX S 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
    BIOSTAR B450MX S has fewer rear USB-C ports than the average motherboard (0 vs 1). The average motherboard has 1 rear USB-C port/s.
  • 3 fewer total USB connections
    BIOSTAR B450MX S has fewer total USB connections than the average motherboard (12 vs 15). The average motherboard has 15 total USB connections.
  • 1 fewer USB 3.2 Gen2 ports
    BIOSTAR B450MX S 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.
  • 1 fewer DisplayPort outputs
    BIOSTAR B450MX S has fewer DisplayPort outputs than the average motherboard (0 vs 1). The average motherboard has 1 DisplayPort outputs.
  • Older HDMI version
    BIOSTAR B450MX S has older HDMI version than the average motherboard (1.4 vs 2.1). The average motherboard supports HDMI 2.1.
  • 1 fewer total USB-C connections
    BIOSTAR B450MX S has fewer total USB-C connections than the average motherboard (0 vs 1). The average motherboard has 1 total USB-C connections.
  • 60% lower LAN speed
    BIOSTAR B450MX S has a lower LAN speed than the average motherboard (1 Gbps vs 2.5 Gbps). The average motherboard offers LAN speed of 2.5 Gbps.
  • No Wi-Fi antenna included
    BIOSTAR B450MX S 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
    BIOSTAR B450MX S has more basic audio codec than the average motherboard (Realtek ALC887 vs Realtek ALC898). The average motherboard uses Realtek ALC898 audio codec.
  • 20 dB lower audio SNR
    BIOSTAR B450MX S has a lower audio SNR than the average motherboard (95 dB vs 115 dB). The average motherboard has audio SNR of 115 dB.
  • 2 fewer 3.5mm audio jacks
    BIOSTAR B450MX S 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
    BIOSTAR B450MX S does not have optical S/PDIF out, while the average motherboard does. 55.7% of motherboards include optical S/PDIF out.
  • Fewer VRM phases
    BIOSTAR B450MX S has fewer VRM phases than the average motherboard (4+2 vs 10). The average motherboard has 10 VRM phase/s.
  • 2 fewer ARGB headers
    BIOSTAR B450MX S has fewer ARGB headers than the average motherboard (0 vs 2). The average motherboard has 2 ARGB header/s.
  • No pump header
    BIOSTAR B450MX S does not have a pump header, while the average motherboard does. 77% of motherboards include a pump header.
  • 2 fewer fan headers
    BIOSTAR B450MX S has fewer fan headers than the average motherboard (3 vs 5). The average motherboard has 5 fan header/s.
  • No onboard RGB lighting
    BIOSTAR B450MX S does not have onboard RGB lighting, while the average motherboard does. 50.3% of motherboards include onboard RGB lighting.
  • 1 fewer RGB headers
    BIOSTAR B450MX S has fewer RGB headers than the average motherboard (0 vs 1). The average motherboard has 1 RGB header/s.
  • 2 A lower pump header current limit
    BIOSTAR B450MX S has a lower pump header current than the average motherboard (0 A vs 2 A). The average motherboard provides pump header current of 2 A.
  • 60% lower LAN speed
    BIOSTAR B450MX S has a lower LAN speed than the average motherboard (1 Gbps vs 2.5 Gbps). The average motherboard offers LAN speed of 2.5 Gbps.
    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

    BIOSTAR B450MX S has a lower LAN speed than the average motherboard (1 Gbps vs 2.5 Gbps). The average motherboard offers LAN speed of 2.5 Gbps.1 Gbps vs 2.5 Gbps
  • More basic motherboard chipset
    BIOSTAR B450MX S has more basic motherboard chipset than the average motherboard (AMD B450 vs Intel B860). The average motherboard uses Intel B860 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

    BIOSTAR B450MX S has more basic motherboard chipset than the average motherboard (AMD B450 vs Intel B860). The average motherboard uses Intel B860 chipset.AMD B450 vs Intel B860
  • Slower M.2 slot interfaces
    BIOSTAR B450MX S has slower M.2 slot interfaces than the average motherboard (1x PCIe 3.0x4/SATA 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

    BIOSTAR B450MX S has slower M.2 slot interfaces than the average motherboard (1x PCIe 3.0x4/SATA 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.1x PCIe 3.0x4/SATA vs 1x PCIe 5.0x4, 2x PCIe 4.0x4
  • No NVMe RAID support
    BIOSTAR B450MX S does not support NVMe RAID, while the average motherboard does. 59.8% of motherboards support NVMe RAID.
    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

    BIOSTAR B450MX S does not support NVMe RAID, while the average motherboard does. 59.8% of motherboards support NVMe RAID.
  • 2 fewer rear USB ports
    BIOSTAR B450MX S 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

    BIOSTAR B450MX S 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 M.2 sockets
    BIOSTAR B450MX S has fewer M.2 sockets than the average motherboard (1 vs 2). The average motherboard has 2 M.2 socket/s.
    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

    BIOSTAR B450MX S has fewer M.2 sockets than the average motherboard (1 vs 2). The average motherboard has 2 M.2 socket/s.1 vs 2
  • No BIOS flashback support
    BIOSTAR B450MX S does not support BIOS flashback, while the average motherboard does. 50.8% of motherboards support BIOS flashback.
    What it is: Shows whether the motherboard can update BIOS without needing a fully installed or supported CPU to boot first.
    When it matters: When you may need to update BIOS before the system can boot.

    Importance: MEDIUM

    BIOSTAR B450MX S does not support BIOS flashback, while the average motherboard does. 50.8% of motherboards support BIOS flashback.
  • No PCIe bifurcation support
    BIOSTAR B450MX S 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

    BIOSTAR B450MX S does not support PCIe bifurcation, while the average motherboard does. 61% of motherboards support PCIe bifurcation.
Total
Overall
Platform & Features
Memory
Storage
Expansion
Ports & USB
Network
Audio
Power & Cooling

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Third-party reviews

United Kingdom
amazon
4.8
11 Reviews
United States
Amazon_logo.png
4.8
11 Reviews

(Reviews last updated: May 2026)

What customers like about BIOSTAR B450MX S?

  • High value for money, frequently cited as an excellent option for budget-conscious gaming builds
  • Supports up to 128GB of DDR4 memory across 4 DIMM slots, which is rare for many ultra-budget B450 boards
  • Solid build quality for its price point with organized component placement and durable construction
  • Good connectivity options for home entertainment, including HDMI, DVI-D, and VGA outputs
  • Includes features like M.2 support and RAID 0, 1, and 10 for flexible storage configurations
  • Ease of BIOS updates using the BIO-Flasher tool

What customers dislike about BIOSTAR B450MX S?

  • The UEFI BIOS interface is often described as clunky, dated, or less user-friendly compared to major competitors
  • Reports of memory compatibility issues, specifically difficulties running certain high-speed RAM (e.g., 3200MHz) or XMP profiles failing
  • VRM thermal concerns; users recommend additional cooling or avoiding high-TDP CPUs (like 8-core Ryzen chips) due to small heatsinks
  • Limited overclocking headroom and a locked current limit (reportedly around 130W) that can lead to CPU throttling on high-end processors
  • Lacks modern premium features such as integrated Wi-Fi or USB-C 20Gbps ports

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