ASUS Prime B450M K II Review | 107 Data compared
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ASUS Prime B450M K II Review | 107 Data compared

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  • Avg. price in UK: ~£90
  • Avg. price in US: ~$100
  • CPU socket: AM4
  • Chipset: AMD B450
  • Form factor: microATX

ASUS Prime B450M K II review. Compare 107 technical specifications and user reviews to see how this product ranks in the Motherboards category and whether it is worth buying.

4.9

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%

4.4

Technical Score

10.0%

9.2

User score

Poor
4.4

Technical Score

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 components:

19.0%

4.3

Memory

16.0%

7.4

Platform & Features

16.0%

4.5

Storage

15.0%

3.3

Network

13.0%

1.9

Ports & USB

8.0%

3.4

Expansion

8.0%

4.0

Power & Cooling

5.0%

6.5

Audio

Poor
9.2

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%

8.8

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
4.4
(1135)
United States
Amazon_logo.png
4.4
(1133)

(Reviews last updated: May 2026)

Exceptional
  • 3.1
    Gaming

    Score components:

    28.0%

    4.5

    VRM phases

    22.0%

    3.3

    N. of M.2 sockets

    18.0%

    1.0

    LAN speed

    17.0%

    4.9

    Maximum RAM speed

    15.0%

    1.0

    N. of PCIe 5.0 x16 slots

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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 Asus Prime B450M-K II is a budget-friendly micro-ATX motherboard based on the AMD B450 chipset, supporting AM4-socket processors including Ryzen 5000 series with a BIOS update. Key specifications include two DDR4 DIMM slots supporting up to 64GB at 4400MHz (O.C.), a single PCIe 3.0 x16 slot, and one M.2 slot offering PCIe 3.0 x4 speeds. Main pros are its extremely low price point, reliable ASUS UEFI BIOS, and the inclusion of a BIOS FlashBack button for easy updates without a CPU. However, notable cons include a lack of VRM heatsinks which can lead to high temperatures under heavy loads, a limited number of just two fan headers, and the absence of PCIe 4.0 support or integrated Wi-Fi.

Technical Specifications of motherboard ASUS Prime B450M K II

Technical Score

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 components:

19.0%

4.3

Memory

16.0%

7.4

Platform & Features

16.0%

4.5

Storage

15.0%

3.3

Network

13.0%

1.9

Ports & USB

8.0%

3.4

Expansion

8.0%

4.0

Power & Cooling

5.0%

6.5

Audio

4.4
ASUS Prime B450M K II has a technical score of 4.4 points, which is lower than that of 89.8% 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%

8.8

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
4.4
(1135)
United States
Amazon_logo.png
4.4
(1133)

(Reviews last updated: May 2026)

9.2
ASUS Prime B450M K II has a user score of 9.16 points, which is higher than that of 90.9% 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.
10
ASUS Prime B450M K II has a popularity of 10 points, which is higher than 91.5% 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%

4.9

Overall score

40.0%

10

Price

6.4
ASUS Prime B450M K II has a quality-to-price ratio of 6.4 points, which is lower than 82.3% 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: LOW

Asus
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
ASUS Prime B450M K II 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
What it is: The processor platform supported by the motherboard, indicating compatibility with Intel or AMD processors.
When it matters: When choosing a motherboard to match your chosen processor brand (Intel or AMD).

Importance: LOW

Good value: Intel

AMD
ASUS Prime B450M K II 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
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
ASUS Prime B450M K II 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: LOW

microATX
ASUS Prime B450M K II 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
ASUS Prime B450M K II uses DDR4 memory, which is newer than that of 13.5% of motherboards and equal to that of 50.8% 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: MEDIUM

Good value: >=4

2
ASUS Prime B450M K II 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

64 GB
ASUS Prime B450M K II supports up to 64 GB of memory, which is less than 62.6% of motherboards and equal to 24.3% 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: LOW

2
ASUS Prime B450M K II supports 2 memory channels, which is more than 0.2% of motherboards and equal to 92.6% 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: LOW

Good value: >=6400 MT/s

4,400 MT/s
ASUS Prime B450M K II supports memory speeds up to 4,400 MT/s, which is lower than that of 51.5% of motherboards and equal to that of 3% of motherboards.
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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
ASUS Prime B450M K II has 1 M.2 sockets, which is fewer than 69.3% 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: MEDIUM

1x PCIe 3 x4/SATA
ASUS Prime B450M K II offers 1x PCIe 3.0x4/SATA for M.2 slot interfaces, which is slower than that of 74.3% 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: LOW

Good value: >=6

4
ASUS Prime B450M K II has 4 SATA 3 connectors, which is more than 5.6% of motherboards and equal to 46.2% 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: LOW

0/1/10
ASUS Prime B450M K II supports RAID levels 0/1/10, which is narrower than 68.1% of motherboards and equal to 23.3% 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: MEDIUM

no
ASUS Prime B450M K II does not support NVMe RAID. 59.8% of motherboards support this feature.
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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: LOW

Good value: >=1

0
ASUS Prime B450M K II 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
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: LOW

Good value: >=1

0
ASUS Prime B450M K II has 0 PCIe 4.0x16 slots, which is fewer than 44.5% of motherboards and equal to 55.5% 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: LOW

1
ASUS Prime B450M K II has 1 PCIe 3.0x16 slots, which is more than 40.5% of motherboards and equal to 26.8% 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: LOW

x16/x8/x4/x1/x1
ASUS Prime B450M K II uses x16/x8/x4/x1/x1 for PCIe slot electrical configuration, which is more flexible than that of 91.4% 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: LOW

Good value: yes

no
ASUS Prime B450M K II does not support PCIe bifurcation. 59.7% of motherboards support this feature.
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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: HIGH

Good value: >=8

6
ASUS Prime B450M K II 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)
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
ASUS Prime B450M K II has 12 USB ports (including headers), which is fewer than 72.6% of motherboards and equal to 16.3% 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
ASUS Prime B450M K II 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: LOW

Good value: >=2

0
ASUS Prime B450M K II has 0 USB-C ports (including headers), which is fewer than 69.7% of motherboards and equal to 30.3% 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: LOW

Good value: >=1

0
ASUS Prime B450M K II has 0 USB 3.2 Gen2x2 ports (USB-C), which is fewer than 18.3% of motherboards and equal to 81.7% of motherboards.
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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
ASUS Prime B450M K II supports LAN speeds up to 1 Gbps, which is lower than that of 50.8% of motherboards and equal to that of 49.2% 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

Realtek RTL8111H
ASUS Prime B450M K II uses the Realtek RTL8,111H LAN controller, which is less advanced than that of 53% of motherboards and equal to that of 7.3% of motherboards.
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: MEDIUM

1
ASUS Prime B450M K II has 1 RJ45 ports, which is fewer than 14.4% of motherboards and 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: LOW

Good value: yes

no
ASUS Prime B450M K II does not support Wi-Fi connectivity. 50.1% 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: HIGH

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

N/A
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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 ALC887/897
ASUS Prime B450M K II uses the Realtek ALC887/897 audio codec, which is less advanced than that of 97.2% of motherboards and equal to that of 0.5% 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
ASUS Prime B450M K II 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: LOW

Good value: >=120 dB

97 dB
ASUS Prime B450M K II 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
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

Good value: yes

yes
ASUS Prime B450M K II supports a headphone amp. 40.8% 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
ASUS Prime B450M K II has 3 3.5mm audio jacks, which is fewer than 50.4% of motherboards and equal to 38.1% of motherboards.
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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: MEDIUM

Good value: >=12

4+2
ASUS Prime B450M K II has 4+2 VRM phases, which is fewer than 88.4% of motherboards and equal to 5.4% 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: LOW

Good value: >=2

1
ASUS Prime B450M K II has 1 CPU power connectors, which is fewer than 45.5% of motherboards and 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: LOW

Good value: >=6

2
ASUS Prime B450M K II has 2 fan headers, which is fewer than 92% of motherboards and equal to 8% 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: LOW

Good value: yes

no
ASUS Prime B450M K II does not have a pump header. 78.1% 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

0 A
ASUS Prime B450M K II supports up to 0 A on the pump header, which is lower than that of 76% of motherboards and equal to that of 24% of motherboards.
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ASUS Prime B450M K II vs the average motherboard

  • Newer CPU socket
    ASUS Prime B450M K II 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

    ASUS Prime B450M K II 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
  • Supports ECC memory
    ASUS Prime B450M K II supports ECC memory, while the average motherboard does not. 21% of motherboards support ECC memory.
    ECC requires compatible CPU.
    What it is: Shows whether the motherboard can work with ECC memory on supported CPU and platform combinations.
    When it matters: When stability and error correction matter in your system.

    Importance: LOW

    Good value: yes

    ASUS Prime B450M K II supports ECC memory, while the average motherboard does not. 21% of motherboards support ECC memory.
  • More flexible PCIe lane configuration
    ASUS Prime B450M K II has more flexible PCIe lane configuration than the average motherboard (x16/x8/x4/x1/x1 vs x16/x0/x4, x8/x8/x4). The average motherboard uses x16/x0/x4, x8/x8/x4 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: LOW

    ASUS Prime B450M K II has more flexible PCIe lane configuration than the average motherboard (x16/x8/x4/x1/x1 vs x16/x0/x4, x8/x8/x4). The average motherboard uses x16/x0/x4, x8/x8/x4 PCIe slot lane configuration.x16/x8/x4/x1/x1 vs x16/x0/x4, x8/x8/x4
  • More advanced LAN controller
    ASUS Prime B450M K II has better LAN controller than the average motherboard (Realtek RTL8,111H vs Killer + Intel + Realtek). The average motherboard uses Killer + Intel + Realtek 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

    ASUS Prime B450M K II has better LAN controller than the average motherboard (Realtek RTL8,111H vs Killer + Intel + Realtek). The average motherboard uses Killer + Intel + Realtek LAN controller.Realtek RTL8111H vs Killer + Intel + Realtek
  • 79 mm shorter
    ASUS Prime B450M K II 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

    ASUS Prime B450M K II is shorter than the average motherboard (226 mm vs 305 mm). The average motherboard height is 305 mm.226 mm vs 305 mm
  • 1 more DVI outputs
    ASUS Prime B450M K II has more DVI outputs than the average motherboard (1 vs 0). The average motherboard has 0 DVI outputs.
    What it is: The number of DVI video outputs on the motherboard.
    When it matters: When you plan to use older compatible monitors.

    Importance: LOW

    ASUS Prime B450M K II has more DVI outputs than the average motherboard (1 vs 0). The average motherboard has 0 DVI outputs.1 vs 0
  • Includes VGA connector
    ASUS Prime B450M K II has a VGA connector, while the average motherboard does not. 24.7% 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

    Good value: yes

    ASUS Prime B450M K II has a VGA connector, while the average motherboard does not. 24.7% of motherboards include a VGA connector.
  • 14.5% higher user score
    ASUS Prime B450M K II has a higher user score than the average motherboard (9.16 vs 8.000).
    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.
    ASUS Prime B450M K II has a higher user score than the average motherboard (9.16 vs 8.000).9.16 vs 8
  • Newer CPU socket
    ASUS Prime B450M K II 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
    ASUS Prime B450M K II 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.
  • Supports ECC memory
    ASUS Prime B450M K II supports ECC memory, while the average motherboard does not. 21% of motherboards support ECC memory.
  • More flexible PCIe lane configuration
    ASUS Prime B450M K II has more flexible PCIe lane configuration than the average motherboard (x16/x8/x4/x1/x1 vs x16/x0/x4, x8/x8/x4). The average motherboard uses x16/x0/x4, x8/x8/x4 PCIe slot lane configuration.
  • 1 more PCIe x1 slots
    ASUS Prime B450M K II has more PCIe x1 slots than the average motherboard (2 vs 1). The average motherboard has 1 PCIe x1 slot/s.
  • 1 more DVI outputs
    ASUS Prime B450M K II has more DVI outputs than the average motherboard (1 vs 0). The average motherboard has 0 DVI outputs.
  • Includes VGA connector
    ASUS Prime B450M K II has a VGA connector, while the average motherboard does not. 24.7% of motherboards include a VGA connector.
  • More advanced LAN controller
    ASUS Prime B450M K II has better LAN controller than the average motherboard (Realtek RTL8,111H vs Killer + Intel + Realtek). The average motherboard uses Killer + Intel + Realtek LAN controller.
  • 79 mm shorter
    ASUS Prime B450M K II 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
Network
Power & Cooling
  • More basic motherboard chipset
    ASUS Prime B450M K II has more basic motherboard chipset than the average motherboard (AMD B450 vs Intel B860). The average motherboard uses Intel B860 chipset.
  • Not suitable for gaming
    ASUS Prime B450M K II is not suitable for gaming, while the average motherboard is. 85.2% of motherboards are suitable for gaming.
    business/productivity-focused
  • No debug LED indicators
    ASUS Prime B450M K II does not have debug LED indicators, while the average motherboard does. 78.7% of motherboards include debug LED indicators.
  • Fewer useful accessories
    ASUS Prime B450M K II has fewer useful accessories than the average motherboard (SATA cables, 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.
  • Older CPU platform
    ASUS Prime B450M K II uses the AMD CPU platform compared to Intel on the average motherboard. The average motherboard uses Intel CPU platform.
  • Less versatile form factor
    ASUS Prime B450M K II has less versatile form factor than the average motherboard (microATX vs ATX). The average motherboard comes in ATX form factor.
  • 2 fewer memory slots
    ASUS Prime B450M K II has fewer memory slots than the average motherboard (2 vs 4). The average motherboard has 4 memory slot/s.
  • 50% less maximum memory capacity
    ASUS Prime B450M K II has fewer maximum memory capacity than the average motherboard (64 GB vs 128 GB). The average motherboard supports 128 GB of memory.
  • Slower M.2 slot interfaces
    ASUS Prime B450M K II 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
    ASUS Prime B450M K II does not support NVMe RAID, while the average motherboard does. 59.8% of motherboards support NVMe RAID.
  • 1 fewer M.2 sockets
    ASUS Prime B450M K II has fewer M.2 sockets than the average motherboard (1 vs 2). The average motherboard has 2 M.2 socket/s.
  • Fewer RAID options
    ASUS Prime B450M K II 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
    ASUS Prime B450M K II does not support PCIe bifurcation, while the average motherboard does. 59.7% of motherboards support PCIe bifurcation.
  • No multi-GPU support
    ASUS Prime B450M K II does not support multi-GPU, while the average motherboard does. 54.6% of motherboards support multi-GPU.
    Single PCIe x16 slot only.
  • 2 fewer rear USB ports
    ASUS Prime B450M K II 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
    ASUS Prime B450M K II 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
    ASUS Prime B450M K II 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
    ASUS Prime B450M K II 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
    ASUS Prime B450M K II has fewer DisplayPort outputs than the average motherboard (0 vs 1). The average motherboard has 1 DisplayPort outputs.
  • 1 fewer total USB-C connections
    ASUS Prime B450M K II 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
    ASUS Prime B450M K II 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 connectivity
    ASUS Prime B450M K II does not support Wi-Fi connectivity, while the average motherboard does. 50% of motherboards support Wi-Fi connectivity.
  • No Wi-Fi antenna included
    ASUS Prime B450M K II 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
    ASUS Prime B450M K II has a lower audio SNR than the average motherboard (97 dB vs 115 dB). The average motherboard has audio SNR of 115 dB.
  • More basic audio codec
    ASUS Prime B450M K II has more basic audio codec than the average motherboard (Realtek ALC887/897 vs Realtek ALC897). The average motherboard uses Realtek ALC897 audio codec.
  • 2 fewer 3.5mm audio jacks
    ASUS Prime B450M K II 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
    ASUS Prime B450M K II does not have optical S/PDIF out, while the average motherboard does. 55.8% of motherboards include optical S/PDIF out.
  • Fewer VRM phases
    ASUS Prime B450M K II has fewer VRM phases than the average motherboard (4+2 vs 10). The average motherboard has 10 VRM phase/s.
  • 3.5 fewer fan headers
    ASUS Prime B450M K II has fewer fan headers than the average motherboard (2 vs 5.5). The average motherboard has 5.5 fan header/s.
  • 2 fewer ARGB headers
    ASUS Prime B450M K II has fewer ARGB headers than the average motherboard (0 vs 2). The average motherboard has 2 ARGB header/s.
  • No pump header
    ASUS Prime B450M K II does not have a pump header, while the average motherboard does. 78.1% of motherboards include a pump header.
  • No onboard RGB lighting
    ASUS Prime B450M K II does not have onboard RGB lighting, while the average motherboard does. 50.4% of motherboards include onboard RGB lighting.
  • 1 fewer RGB headers
    ASUS Prime B450M K II 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
    ASUS Prime B450M K II 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
    ASUS Prime B450M K II 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

    ASUS Prime B450M K II 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
    ASUS Prime B450M K II 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

    ASUS Prime B450M K II 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
    ASUS Prime B450M K II 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: MEDIUM

    ASUS Prime B450M K II 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 3x4/SATA vs 1x PCIe 5x4, 2x PCIe 4x4
  • 2 fewer memory slots
    ASUS Prime B450M K II 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: MEDIUM

    Good value: >=4

    ASUS Prime B450M K II has fewer memory slots than the average motherboard (2 vs 4). The average motherboard has 4 memory slot/s.2 vs 4
  • No NVMe RAID support
    ASUS Prime B450M K II 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: MEDIUM

    ASUS Prime B450M K II does not support NVMe RAID, while the average motherboard does. 59.8% of motherboards support NVMe RAID.
  • 2 fewer rear USB ports
    ASUS Prime B450M K II 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: HIGH

    Good value: >=8

    ASUS Prime B450M K II has fewer rear USB ports than the average motherboard (6 vs 8). The average motherboard has 8 rear USB port/s.6 vs 8
  • 50% less maximum memory capacity
    ASUS Prime B450M K II has fewer maximum memory capacity than the average motherboard (64 GB vs 128 GB). The average motherboard supports 128 GB of memory.
    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

    ASUS Prime B450M K II has fewer maximum memory capacity than the average motherboard (64 GB vs 128 GB). The average motherboard supports 128 GB of memory.64 GB vs 128 GB
  • 1 fewer M.2 sockets
    ASUS Prime B450M K II 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

    ASUS Prime B450M K II has fewer M.2 sockets than the average motherboard (1 vs 2). The average motherboard has 2 M.2 socket/s.1 vs 2
Total
Overall
Platform & Features
Memory
Storage
Expansion
Ports & USB
Network
Audio
Power & Cooling

Graphic comparison of ASUS Prime B450M K II and other products in the Motherboards category

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Third-party reviews

United Kingdom
amazon
4.4
1135 Reviews
United States
Amazon_logo.png
4.4
1133 Reviews

(Reviews last updated: May 2026)

What customers like about ASUS Prime B450M K II?

  • Extremely affordable price point, making it ideal for ultra-budget and office builds.
  • Integrated BIOS Flashback button allows for easy BIOS updates without needing a CPU installed.
  • Reliable and intuitive ASUS UEFI BIOS with user-friendly fan controls (Q-Fan).
  • Compact Micro-ATX form factor fits easily into smaller cases.
  • Solid performance and stability when paired with low-TDP processors like the Ryzen 5 3600 or 4000/5000G series.
  • Includes basic aesthetic touches like orange LED trace lighting on the PCB.

What customers dislike about ASUS Prime B450M K II?

  • Lack of VRM heatsinks leads to high thermal levels when using high-performance or 105W TDP CPUs.
  • Limited expansion with only two DIMM (RAM) slots and a single M.2 storage slot.
  • Sparse rear I/O connectivity, including a low number of USB ports compared to mid-range boards.
  • Only two fan headers (one CPU, one chassis), often requiring additional splitters or hubs for cooling.
  • Uses the older PCIe 3.0 standard, lacking the faster bandwidth of PCIe 4.0 found on B550 boards.
  • Includes legacy ports like VGA and DVI-D which take up valuable rear I/O space for modern users.

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