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ASUS Prime B660M K D4 Review | 107 Data compared

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  • Avg. price in UK: ~£90
  • Avg. price in US: ~$120
  • CPU socket: LGA 1700
  • Chipset: Intel B660
  • Form factor: microATX

ASUS Prime B660M K D4 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%

4.8

Technical Score

10.0%

7.9

User score

Good
4.8

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%

4.3

Memory

16.0%

7.1

Platform & Features

16.0%

5.8

Storage

15.0%

5.5

Network

13.0%

1.8

Ports & USB

8.0%

3.4

Expansion

8.0%

4.1

Power & Cooling

5.0%

5.8

Audio

Poor
7.9

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%

5.8

Popularity

User score:
United Kingdom
amazon
4.4
(124)
amazon
5.0
(1)

(Reviews last updated: May 2026)

Very good
  • 4.7
    Gaming

    Score components:

    28.0%

    5.2

    VRM phases

    22.0%

    5.5

    N. of M.2 sockets

    18.0%

    4.6

    LAN speed

    17.0%

    6.3

    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 ASUS Prime B660M-K D4 is a budget-friendly micro-ATX motherboard designed for 12th, 13th, and 14th Gen Intel processors on the LGA 1700 socket. It features two DDR4 DIMM slots supporting up to 64GB of memory at overclocked speeds of 5333MHz, alongside a PCIe 4.0 x16 slot for graphics cards and dual M.2 slots (both PCIe 4.0 x4) for high-speed NVMe storage. Main pros include its affordability, robust cooling with VRM and PCH heatsinks, and a solid 6+1+1 power stage design with ProCool connectors. However, notable cons include the lack of USB Type-C or Thunderbolt ports on the rear I/O, a limit of only two RAM slots for future expansion, and a basic 1Gb Ethernet port instead of faster 2.5Gb alternatives.

Technical Specifications of ASUS Prime B660M K D4

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%

4.3

Memory

16.0%

7.1

Platform & Features

16.0%

5.8

Storage

15.0%

5.5

Network

13.0%

1.8

Ports & USB

8.0%

3.4

Expansion

8.0%

4.1

Power & Cooling

5.0%

5.8

Audio

4.8
ASUS Prime B660M K D4 has a technical score of 4.82 points, which is lower than that of 82.7% of products in this category.
User score

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

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

Score components:

70.0%

8.8

User reviews

30.0%

5.8

Popularity

User score:
United Kingdom
amazon
4.4
(124)
amazon
5.0
(1)

(Reviews last updated: May 2026)

7.9
ASUS Prime B660M K D4 has a user score of 7.91 points, which is lower than that of 54.6% 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.
5.8
ASUS Prime B660M K D4 has a popularity of 5.8 points, which is higher than 61.9% 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%

10

Price

6.6
ASUS Prime B660M K D4 has a quality-to-price ratio of 6.6 points, which is lower than 75.9% 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

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

LGA 1700
ASUS Prime B660M K D4 uses the LGA 1700 CPU socket, which is more advanced than that of 55% of motherboards and equal to that of 22.7% of motherboards.
CPU platform

Importance: MEDIUM

Intel
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

Intel B660
ASUS Prime B660M K D4 uses the Intel B660 chipset, which is more advanced than that of 57.6% of motherboards and equal to that of 2.8% 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
ASUS Prime B660M K D4 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
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 B660M K D4 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

2
ASUS Prime B660M K D4 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 B660M K D4 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: MEDIUM

2
ASUS Prime B660M K D4 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

5,333 MT/s
ASUS Prime B660M K D4 supports memory speeds up to 5333 MT/s, which is higher than that of 62.9% of motherboards and equal to that of 5.2% 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

2
ASUS Prime B660M K D4 has 2 M.2 sockets, which is more than 30.8% of motherboards and equal to 34.6% of motherboards.
M.2 slot interface per slot
What it is: The storage or PCIe interface available for each M.2 slot on the motherboard.
When it matters: When you want to check which drives each M.2 slot can use.

Importance: HIGH

2x PCIe 4.0 x4
ASUS Prime B660M K D4 offers 2x PCIe 4.0x4 for M.2 slot interfaces, which is faster than that of 56.3% of motherboards and equal to that of 5.2% of motherboards.
N. of SATA 3 connectors
What it is: The number of SATA 6Gb/s connectors on the motherboard.
When it matters: When you plan to connect multiple SATA drives.

Importance: MEDIUM

Good value: >=6

4
ASUS Prime B660M K D4 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

0/1/5/10
ASUS Prime B660M K D4 supports RAID levels 0/1/5/10, which is broader than 31.8% of motherboards and equal to 68.2% of motherboards.
SATA only
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
ASUS Prime B660M K D4 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: HIGH

Good value: >=1

0
ASUS Prime B660M K D4 has 0 PCIe 5.0x16 slots, which is equal to 68.5% of motherboards.
N. of PCIe 4.0 x16 slots
What it is: The number of PCIe 4.0 x16 physical slots on the motherboard.
When it matters: When you want more room for modern expansion cards.

Importance: HIGH

Good value: >=1

1
ASUS Prime B660M K D4 has 1 PCIe 4.0x16 slots, which is more than 55.6% of motherboards and equal to 35.3% of motherboards.
N. of PCIe 3.0 x16 slots
What it is: The number of PCIe 3.0 x16 physical slots on the motherboard.
When it matters: When you need more full-length expansion slots.

Importance: MEDIUM

1
ASUS Prime B660M K D4 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

?
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
ASUS Prime B660M K D4 does not support PCIe bifurcation. 61% 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: MEDIUM

Good value: >=8

6
ASUS Prime B660M K D4 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
ASUS Prime B660M K D4 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
ASUS Prime B660M K D4 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
ASUS Prime B660M K D4 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
ASUS Prime B660M K D4 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
ASUS Prime B660M K D4 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
ASUS Prime B660M K D4 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
ASUS Prime B660M K D4 does not support Wi-Fi connectivity. 49.1% of motherboards support this feature.
Wi-Fi version
What it is: The supported Wi-Fi generation, such as Wi-Fi 6 or Wi-Fi 7.
When it matters: When you care about wireless speed and router compatibility.

Importance: MEDIUM

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

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

Importance: MEDIUM

Realtek ALC897
ASUS Prime B660M K D4 uses the Realtek ALC897 audio codec, which is less advanced than that of 50.8% of motherboards and equal to that of 29.3% of motherboards.
Audio channels
What it is: The audio channel configuration supported by the onboard sound solution.
When it matters: When you want surround sound from the motherboard audio outputs.

Importance: LOW

Good value: 7.1

7.1
ASUS Prime B660M K D4 offers 7.1 audio channels, which is more than 4.9% of motherboards and equal to 95.1% of motherboards.
full 7.1 needs front panel audio.
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

97 dB
ASUS Prime B660M K D4 has an audio SNR of 97 dB, which is lower than that of 67.3% of motherboards and equal to that of 16.8% 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

no
ASUS Prime B660M K D4 does not support a headphone amp. 63% 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 B660M K D4 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

6+1+1
ASUS Prime B660M K D4 has 6+1+1 VRM phases, which is fewer than 78.6% of motherboards and equal to 1% 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
ASUS Prime B660M K D4 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

2
ASUS Prime B660M K D4 has 2 fan headers, which is fewer than 91.7% of motherboards and equal to 8.3% 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
ASUS Prime B660M K D4 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
ASUS Prime B660M K D4 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

ASUS Prime B660M K D4 vs the average motherboard

  • Newer CPU socket
    ASUS Prime B660M K D4 has newer CPU socket than the average motherboard (LGA 1,700 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 B660M K D4 has newer CPU socket than the average motherboard (LGA 1,700 vs LGA 1,151). The average motherboard uses LGA 1,151 CPU socket.LGA 1700 vs LGA 1151
  • 1 more PCIe 4.0x16 slots
    ASUS Prime B660M K D4 has more PCIe 4.0x16 slots than the average motherboard (1 vs 0). The average motherboard has 0 PCIe 4.0x16 slot/s.
    What it is: The number of PCIe 4.0 x16 physical slots on the motherboard.
    When it matters: When you want more room for modern expansion cards.

    Importance: HIGH

    Good value: >=1

    ASUS Prime B660M K D4 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
  • Includes VGA connector
    ASUS Prime B660M K D4 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

    ASUS Prime B660M K D4 has a VGA connector, while the average motherboard does not. 22% of motherboards include a VGA connector.
  • 1 more PCIe x1 slots
    ASUS Prime B660M K D4 has more PCIe x1 slots than the average motherboard (2 vs 1). The average motherboard has 1 PCIe x1 slot/s.
    What it is: The number of PCIe x1 slots on the motherboard.
    When it matters: When you want space for smaller add-in cards.

    Importance: MEDIUM

    Good value: >=2

    ASUS Prime B660M K D4 has more PCIe x1 slots than the average motherboard (2 vs 1). The average motherboard has 1 PCIe x1 slot/s.2 vs 1
  • 77.8% cheaper
    ASUS Prime B660M K D4 is cheaper than the average motherboard (£90 vs £160).
    ASUS Prime B660M K D4 is cheaper than the average motherboard (£90 vs £160).£90 vs £160
  • 61 mm shorter
    ASUS Prime B660M K D4 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

    ASUS Prime B660M K D4 is shorter than the average motherboard (244 mm vs 305 mm). The average motherboard height is 305 mm.244 mm vs 305 mm
  • 15.9% higher maximum RAM speed
    ASUS Prime B660M K D4 has a higher maximum RAM speed than the average motherboard (5,333 MT/s vs 4,600 MT/s). The average motherboard supports RAM speed of 4,600 MT/s.
    What it is: The highest officially supported memory speed for the motherboard.
    When it matters: When you choose RAM and want to know the supported speed ceiling.

    Importance: HIGH

    Good value: >=6400 MT/s

    ASUS Prime B660M K D4 has a higher maximum RAM speed than the average motherboard (5,333 MT/s vs 4,600 MT/s). The average motherboard supports RAM speed of 4,600 MT/s.5333 MT/s vs 4600 MT/s
  • Newer CPU socket
    ASUS Prime B660M K D4 has newer CPU socket than the average motherboard (LGA 1,700 vs LGA 1,151). The average motherboard uses LGA 1,151 CPU socket.
  • 15.9% higher maximum RAM speed
    ASUS Prime B660M K D4 has a higher maximum RAM speed than the average motherboard (5,333 MT/s vs 4,600 MT/s). The average motherboard supports RAM speed of 4,600 MT/s.
  • 1 more PCIe 4.0x16 slots
    ASUS Prime B660M K D4 has more PCIe 4.0x16 slots than the average motherboard (1 vs 0). The average motherboard has 0 PCIe 4.0x16 slot/s.
  • 1 more PCIe x1 slots
    ASUS Prime B660M K D4 has more PCIe x1 slots than the average motherboard (2 vs 1). The average motherboard has 1 PCIe x1 slot/s.
  • Includes VGA connector
    ASUS Prime B660M K D4 has a VGA connector, while the average motherboard does not. 22% of motherboards include a VGA connector.
  • 61 mm shorter
    ASUS Prime B660M K D4 is shorter than the average motherboard (244 mm vs 305 mm). The average motherboard height is 305 mm.

Total
Overall
Platform & Features
Memory
Expansion
Ports & USB
Power & Cooling
  • More basic motherboard chipset
    ASUS Prime B660M K D4 has more basic motherboard chipset than the average motherboard (Intel B660 vs Intel B860). The average motherboard uses Intel B860 chipset.
  • No BIOS flashback support
    ASUS Prime B660M K D4 does not support BIOS flashback, while the average motherboard does. 50.8% of motherboards support BIOS flashback.
  • No debug LED indicators
    ASUS Prime B660M K D4 does not have debug LED indicators, while the average motherboard does. 78.8% of motherboards include debug LED indicators.
  • Fewer BIOS update options
    ASUS Prime B660M K D4 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.
  • Less versatile form factor
    ASUS Prime B660M K D4 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 B660M K D4 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 B660M K D4 has fewer maximum memory capacity than the average motherboard (64 GB vs 128 GB). The average motherboard supports 128 GB of memory.
  • No NVMe RAID support
    ASUS Prime B660M K D4 does not support NVMe RAID, while the average motherboard does. 59.8% of motherboards support NVMe RAID.
  • Slower M.2 slot interfaces
    ASUS Prime B660M K D4 has slower M.2 slot interfaces than the average motherboard (2x PCIe 4.0x4 vs 1x PCIe 5.0x4, 2x PCIe 4.0x4). The average motherboard uses 1x PCIe 5.0x4, 2x PCIe 4.0x4 M.2 slot interfaces.
  • No PCIe bifurcation support
    ASUS Prime B660M K D4 does not support PCIe bifurcation, while the average motherboard does. 61% of motherboards support PCIe bifurcation.
  • No multi-GPU support
    ASUS Prime B660M K D4 does not support multi-GPU, while the average motherboard does. 54.6% of motherboards support multi-GPU.
  • 2 fewer rear USB ports
    ASUS Prime B660M K D4 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 B660M K D4 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 B660M K D4 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 B660M K D4 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 B660M K D4 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 B660M K D4 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 B660M K D4 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
    ASUS Prime B660M K D4 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 B660M K D4 has a lower audio SNR than the average motherboard (97 dB vs 115 dB). The average motherboard has audio SNR of 115 dB.
  • No headphone amp support
    ASUS Prime B660M K D4 does not support a headphone amp, while the average motherboard does. 63% of motherboards support a headphone amp.
  • More basic audio codec
    ASUS Prime B660M K D4 has more basic audio codec than the average motherboard (Realtek ALC897 vs Realtek ALC898). The average motherboard uses Realtek ALC898 audio codec.
  • 2 fewer 3.5mm audio jacks
    ASUS Prime B660M K D4 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 B660M K D4 does not have optical S/PDIF out, while the average motherboard does. 55.7% of motherboards include optical S/PDIF out.
  • 2 fewer ARGB headers
    ASUS Prime B660M K D4 has fewer ARGB headers than the average motherboard (0 vs 2). The average motherboard has 2 ARGB header/s.
  • No pump header
    ASUS Prime B660M K D4 does not have a pump header, while the average motherboard does. 77% of motherboards include a pump header.
  • Fewer VRM phases
    ASUS Prime B660M K D4 has fewer VRM phases than the average motherboard (6+1+1 vs 10). The average motherboard has 10 VRM phase/s.
  • 3 fewer fan headers
    ASUS Prime B660M K D4 has fewer fan headers than the average motherboard (2 vs 5). The average motherboard has 5 fan header/s.
  • No onboard RGB lighting
    ASUS Prime B660M K D4 does not have onboard RGB lighting, while the average motherboard does. 50.3% of motherboards include onboard RGB lighting.
  • 2 A lower pump header current limit
    ASUS Prime B660M K D4 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 B660M K D4 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 B660M K D4 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
  • 2 fewer memory slots
    ASUS Prime B660M K D4 has fewer memory slots than the average motherboard (2 vs 4). The average motherboard has 4 memory slot/s.
    What it is: The number of RAM slots on the motherboard.
    When it matters: When you want more room for future memory upgrades.

    Importance: HIGH

    Good value: >=4

    ASUS Prime B660M K D4 has fewer memory slots than the average motherboard (2 vs 4). The average motherboard has 4 memory slot/s.2 vs 4
  • More basic motherboard chipset
    ASUS Prime B660M K D4 has more basic motherboard chipset than the average motherboard (Intel B660 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 B660M K D4 has more basic motherboard chipset than the average motherboard (Intel B660 vs Intel B860). The average motherboard uses Intel B860 chipset.Intel B660 vs Intel B860
  • No NVMe RAID support
    ASUS Prime B660M K D4 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

    ASUS Prime B660M K D4 does not support NVMe RAID, while the average motherboard does. 59.8% of motherboards support NVMe RAID.
  • 2 fewer rear USB ports
    ASUS Prime B660M K D4 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

    ASUS Prime B660M K D4 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 B660M K D4 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 B660M K D4 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
  • Slower M.2 slot interfaces
    ASUS Prime B660M K D4 has slower M.2 slot interfaces than the average motherboard (2x PCIe 4.0x4 vs 1x PCIe 5.0x4, 2x PCIe 4.0x4). The average motherboard uses 1x PCIe 5.0x4, 2x PCIe 4.0x4 M.2 slot interfaces.
    What it is: The storage or PCIe interface available for each M.2 slot on the motherboard.
    When it matters: When you want to check which drives each M.2 slot can use.

    Importance: HIGH

    ASUS Prime B660M K D4 has slower M.2 slot interfaces than the average motherboard (2x PCIe 4.0x4 vs 1x PCIe 5.0x4, 2x PCIe 4.0x4). The average motherboard uses 1x PCIe 5.0x4, 2x PCIe 4.0x4 M.2 slot interfaces.2x PCIe 4.0x4 vs 1x PCIe 5.0x4, 2x PCIe 4.0x4
  • No BIOS flashback support
    ASUS Prime B660M K D4 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

    ASUS Prime B660M K D4 does not support BIOS flashback, while the average motherboard does. 50.8% of motherboards support BIOS flashback.
Total
Overall
Platform & Features
Memory
Storage
Expansion
Ports & USB
Network
Audio
Power & Cooling

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Third-party reviews

United Kingdom
amazon
4.4
124 Reviews
amazon
5.0
1 Reviews

(Reviews last updated: May 2026)

What customers like about ASUS Prime B660M K D4?

  • Affordable entry-level pricing for the Intel 12th/13th Gen platform
  • Dual M.2 slots supporting PCIe 4.0 for fast storage
  • Intuitive BIOS that is easy for beginners to navigate and troubleshoot
  • Surprisingly decent memory overclocking capabilities for a budget board
  • Compact mATX form factor that fits easily into most cases

What customers dislike about ASUS Prime B660M K D4?

  • Lacks rear-panel USB-C and Thunderbolt support
  • No built-in Wi-Fi or Bluetooth connectivity
  • Weak VRM cooling which can lead to thermal throttling with high-end CPUs like the i5-12600K or i7
  • Limited upgrade path due to basic power delivery and lack of VRM heatsinks
  • Only two RAM slots, limiting total memory expansion compared to boards with four slots
  • Minimal internal headers, including only one system fan header in some versions

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