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ASUS Pro B660M C D4 CSM Review | 107 Data compared

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  • Avg. price in UK: ~£130
  • Avg. price in US: ~$130
  • CPU socket: LGA 1700
  • Chipset: Intel B660
  • Form factor: microATX

ASUS Pro B660M C D4 CSM review. Compare 107 technical specifications and user reviews to see how it ranks among motherboards and if it is worth buying.

5.5

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%

5.3

Technical Score

10.0%

7.6

User score

Good
5.3

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%

6.8

Memory

16.0%

7.0

Platform & Features

16.0%

5.8

Storage

15.0%

5.3

Network

13.0%

1.7

Ports & USB

8.0%

3.9

Expansion

8.0%

4.1

Power & Cooling

5.0%

6.7

Audio

Good
7.6

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%

9.4

User reviews

30.0%

3.4

Popularity

User score:
United Kingdom
amazon
4.8
(27)
amazon
4.5
(10)
United States
Amazon_logo.png
4.8
(27)
Amazon_logo.png
4.5
(10)

(Reviews last updated: May 2026)

Very good
  • 4.2
    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%

    3.3

    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 Pro B660M-C D4-CSM is a micro-ATX business motherboard featuring the Intel LGA 1700 socket for 12th, 13th, and 14th Gen processors, supported by the Intel B660 chipset and four DDR4 DIMM slots for up to 128GB of memory. Key characteristics include PCIe 4.0 connectivity for GPUs and storage, dual M.2 slots, and enterprise-grade reliability features like an anti-moisture coating, anti-sulfur resistors, and a self-recovering BIOS. Its primary pros are the included ASUS Control Center Express for remote IT management, a stable 36-month supply lifecycle through the Corporate Stable Model (CSM) program, and robust legacy support with internal COM and LPT headers. However, notable cons include a lack of integrated Wi-Fi or Bluetooth, the absence of high-speed 2.5Gb Ethernet (limited to 1GbE), and only three fan headers, which may limit cooling configurations in larger builds.

Technical Specifications of ASUS Pro B660M C D4 CSM

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%

6.8

Memory

16.0%

7.0

Platform & Features

16.0%

5.8

Storage

15.0%

5.3

Network

13.0%

1.7

Ports & USB

8.0%

3.9

Expansion

8.0%

4.1

Power & Cooling

5.0%

6.7

Audio

5.3
ASUS Pro B660M C D4 CSM has a technical score of 5.32 points, which is lower than that of 72.6% 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%

9.4

User reviews

30.0%

3.4

Popularity

User score:
United Kingdom
amazon
4.8
(27)
amazon
4.5
(10)
United States
Amazon_logo.png
4.8
(27)
Amazon_logo.png
4.5
(10)

(Reviews last updated: May 2026)

7.6
ASUS Pro B660M C D4 CSM has a user score of 7.63 points, which is lower than that of 60.4% of products in this category.
Popularity
What it is: An indicator based on the number of reviews received by the motherboard.
When it matters: When you prefer a motherboard that has already been bought and reviewed by many other users.
3.4
ASUS Pro B660M C D4 CSM has a popularity of 3.4 points, which is lower than 56% 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%

5.5

Overall score

40.0%

9.8

Price

6.8
ASUS Pro B660M C D4 CSM has a quality-to-price ratio of 6.8 points, which is lower than 69.3% 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

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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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
ASUS Pro B660M C D4 CSM 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
ASUS Pro B660M C D4 CSM 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
ASUS Pro B660M C D4 CSM 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

3,200 MT/s
ASUS Pro B660M C D4 CSM supports memory speeds up to 3200 MT/s, which is lower than that of 62.8% of motherboards and equal to that of 10.9% 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

2
ASUS Pro B660M C D4 CSM 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

1x PCIe 4.0 x4, 1x PCIe 4.0 x4/SATA
ASUS Pro B660M C D4 CSM offers 1x PCIe 4.0x4, 1x PCIe 4.0x4/SATA for M.2 slot interfaces, which is faster than that of 50.4% of motherboards and equal to that of 3.2% 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM supports RAID levels 0/1/5/10, which is broader than 31.8% of motherboards and equal to 68.2% of motherboards.
JBOD excluded from RAID-level set
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 Pro B660M C D4 CSM 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
ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM has 1 PCIe 4.0x16 slots, which is more than 55.6% of motherboards and equal to 35.3% of motherboards.
N. of PCIe 3.0 x16 slots
What it is: The number of PCIe 3.0 x16 physical slots on the motherboard.
When it matters: When you need more full-length expansion slots.

Importance: MEDIUM

0
ASUS Pro B660M C D4 CSM has 0 PCIe 3.0x16 slots, which is fewer than 59.5% of motherboards and equal to 40.5% 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/x1/x1
ASUS Pro B660M C D4 CSM uses x16/x1/x1 for PCIe slot electrical configuration, which is less flexible than that of 61.7% of motherboards and equal to that of 8% 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

yes
ASUS Pro B660M C D4 CSM supports PCIe bifurcation. 39.1% 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

4
ASUS Pro B660M C D4 CSM has 4 USB ports (rear I/O), which is fewer than 97.9% of motherboards and equal to 2% 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

11
ASUS Pro B660M C D4 CSM has 11 USB ports (including headers), which is fewer than 89% of motherboards and equal to 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 Pro B660M C D4 CSM has 0 USB-C ports (rear I/O), which is fewer than 64.6% of motherboards and equal to 35.4% of motherboards.
Total USB-C ports (including headers)
What it is: The total number of USB-C ports supported when rear ports and internal headers are counted together.
When it matters: When you want more USB-C connectivity across the whole build.

Importance: MEDIUM

Good value: >=2

1
ASUS Pro B660M C D4 CSM has 1 USB-C ports (including headers), which is more than 30.5% of motherboards and equal to 21.3% of motherboards.
N. of USB 3.2 Gen2x2 ports (USB-C)
What it is: The number of rear USB 3.2 Gen2x2 Type-C ports on the motherboard.
When it matters: When you want very fast USB-C connectivity on the rear I/O.

Importance: HIGH

Good value: >=1

0
ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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

Intel I219-V
ASUS Pro B660M C D4 CSM uses the Intel I219-V LAN controller, which is more advanced than that of 41% of motherboards and equal to that of 14.2% 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: LOW

1
ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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

97 dB
ASUS Pro B660M C D4 CSM 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

yes
ASUS Pro B660M C D4 CSM 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
ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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
ASUS Pro B660M C D4 CSM 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
ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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.
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ASUS Pro B660M C D4 CSM vs the average motherboard

  • Newer CPU socket
    ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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
  • Includes dual BIOS
    ASUS Pro B660M C D4 CSM has dual BIOS, while the average motherboard does not. 22.4% of motherboards include dual BIOS.
    What it is: Shows whether the motherboard includes two BIOS chips for redundancy or recovery.
    When it matters: When BIOS safety and recovery matter to you.

    Importance: LOW

    ASUS Pro B660M C D4 CSM has dual BIOS, while the average motherboard does not. 22.4% of motherboards include dual BIOS.
  • 1 more PCIe 4.0x16 slots
    ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 discrete TPM
    ASUS Pro B660M C D4 CSM includes a discrete TPM, while the average motherboard does not. 0.1% of motherboards include a discrete TPM.
    What it is: Shows whether a separate TPM module is bundled with the motherboard in the box.
    When it matters: When you want TPM features without buying a separate module.

    Importance: LOW

    ASUS Pro B660M C D4 CSM includes a discrete TPM, while the average motherboard does not. 0.1% of motherboards include a discrete TPM.
  • Includes VGA connector
    ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM has a VGA connector, while the average motherboard does not. 22% of motherboards include a VGA connector.
  • 1 more PCIe x1 slots
    ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM has more PCIe x1 slots than the average motherboard (2 vs 1). The average motherboard has 1 PCIe x1 slot/s.2 vs 1
  • 61 mm shorter
    ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM is shorter than the average motherboard (244 mm vs 305 mm). The average motherboard height is 305 mm.244 mm vs 305 mm
  • 1 more DisplayPort outputs
    ASUS Pro B660M C D4 CSM has more DisplayPort outputs than the average motherboard (2 vs 1). The average motherboard has 1 DisplayPort outputs.
    What it is: The number of DisplayPort video outputs on the motherboard.
    When it matters: When you want to connect compatible displays through the rear I/O.

    Importance: MEDIUM

    Good value: >=1

    ASUS Pro B660M C D4 CSM has more DisplayPort outputs than the average motherboard (2 vs 1). The average motherboard has 1 DisplayPort outputs.2 vs 1
  • Newer CPU socket
    ASUS Pro B660M C D4 CSM has newer CPU socket than the average motherboard (LGA 1,700 vs LGA 1,151). The average motherboard uses LGA 1,151 CPU socket.
  • Includes dual BIOS
    ASUS Pro B660M C D4 CSM has dual BIOS, while the average motherboard does not. 22.4% of motherboards include dual BIOS.
  • Includes discrete TPM
    ASUS Pro B660M C D4 CSM includes a discrete TPM, while the average motherboard does not. 0.1% of motherboards include a discrete TPM.
  • 1 more PCIe 4.0x16 slots
    ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM has a VGA connector, while the average motherboard does not. 22% of motherboards include a VGA connector.
  • 1 more DisplayPort outputs
    ASUS Pro B660M C D4 CSM has more DisplayPort outputs than the average motherboard (2 vs 1). The average motherboard has 1 DisplayPort outputs.
  • 61 mm shorter
    ASUS Pro B660M C D4 CSM 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
    ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM does not support BIOS flashback, while the average motherboard does. 50.8% of motherboards support BIOS flashback.
    requires CPU/RAM
  • Not suitable for gaming
    ASUS Pro B660M C D4 CSM is not suitable for gaming, while the average motherboard is. 86.3% of motherboards are suitable for gaming.
    workstation/server-focused
  • No automatic overclocking
    ASUS Pro B660M C D4 CSM does not support automatic overclocking, while the average motherboard does. 74% of motherboards support automatic overclocking.
    memory auto-OC only
  • Less versatile form factor
    ASUS Pro B660M C D4 CSM has less versatile form factor than the average motherboard (microATX vs ATX). The average motherboard comes in ATX form factor.
  • No TPM connector
    ASUS Pro B660M C D4 CSM does not have a TPM connector, while the average motherboard does. 86.7% of motherboards include a TPM connector.
  • 30.4% lower maximum RAM speed
    ASUS Pro B660M C D4 CSM has a lower maximum RAM speed than the average motherboard (3,200 MT/s vs 4,600 MT/s). The average motherboard supports RAM speed of 4,600 MT/s.
    maximum depends on CPU configuration
  • No NVMe RAID support
    ASUS Pro B660M C D4 CSM does not support NVMe RAID, while the average motherboard does. 59.8% of motherboards support NVMe RAID.
  • Slower M.2 slot interfaces
    ASUS Pro B660M C D4 CSM has slower M.2 slot interfaces than the average motherboard (1x PCIe 4.0x4, 1x PCIe 4.0x4/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 multi-GPU support
    ASUS Pro B660M C D4 CSM does not support multi-GPU, while the average motherboard does. 54.6% of motherboards support multi-GPU.
    Single PCIe x16 slot only.
  • 1 fewer PCIe 3.0x16 slots
    ASUS Pro B660M C D4 CSM has fewer PCIe 3.0x16 slots than the average motherboard (0 vs 1). The average motherboard has 1 PCIe 3.0x16 slot/s.
  • 4 fewer rear USB ports
    ASUS Pro B660M C D4 CSM has fewer rear USB ports than the average motherboard (4 vs 8). The average motherboard has 8 rear USB port/s.
  • 4 fewer total USB connections
    ASUS Pro B660M C D4 CSM has fewer total USB connections than the average motherboard (11 vs 15). The average motherboard has 15 total USB connections.
  • 1 fewer rear USB-C ports
    ASUS Pro B660M C D4 CSM has fewer rear USB-C ports than the average motherboard (0 vs 1). The average motherboard has 1 rear USB-C port/s.
  • 1 fewer USB 3.2 Gen2 ports
    ASUS Pro B660M C D4 CSM has fewer USB 3.2 Gen2 ports than the average motherboard (0 vs 1). The average motherboard has 1 USB 3.2 Gen2 port/s.
  • 2 fewer USB 3.2 Gen1 ports
    ASUS Pro B660M C D4 CSM has fewer USB 3.2 Gen1 ports than the average motherboard (2 vs 4). The average motherboard has 4 USB 3.2 Gen1 port/s.
  • 60% lower LAN speed
    ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM has fewer ARGB headers than the average motherboard (0 vs 2). The average motherboard has 2 ARGB header/s.
  • No pump header
    ASUS Pro B660M C D4 CSM does not have a pump header, while the average motherboard does. 77% of motherboards include a pump header.
  • Fewer VRM phases
    ASUS Pro B660M C D4 CSM has fewer VRM phases than the average motherboard (6+1+1 vs 10). The average motherboard has 10 VRM phase/s.
  • 2 fewer fan headers
    ASUS Pro B660M C D4 CSM has fewer fan headers than the average motherboard (3 vs 5). The average motherboard has 5 fan header/s.
  • No onboard RGB lighting
    ASUS Pro B660M C D4 CSM does not have onboard RGB lighting, while the average motherboard does. 50.3% of motherboards include onboard RGB lighting.
  • 1 fewer RGB headers
    ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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
  • 4 fewer rear USB ports
    ASUS Pro B660M C D4 CSM has fewer rear USB ports than the average motherboard (4 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 Pro B660M C D4 CSM has fewer rear USB ports than the average motherboard (4 vs 8). The average motherboard has 8 rear USB port/s.4 vs 8
  • More basic motherboard chipset
    ASUS Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM 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 Pro B660M C D4 CSM does not support NVMe RAID, while the average motherboard does. 59.8% of motherboards support NVMe RAID.
  • Slower M.2 slot interfaces
    ASUS Pro B660M C D4 CSM has slower M.2 slot interfaces than the average motherboard (1x PCIe 4.0x4, 1x PCIe 4.0x4/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

    ASUS Pro B660M C D4 CSM has slower M.2 slot interfaces than the average motherboard (1x PCIe 4.0x4, 1x PCIe 4.0x4/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 4.0x4, 1x PCIe 4.0x4/SATA vs 1x PCIe 5.0x4, 2x PCIe 4.0x4
  • 4 fewer total USB connections
    ASUS Pro B660M C D4 CSM has fewer total USB connections than the average motherboard (11 vs 15). The average motherboard has 15 total USB connections.
    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

    ASUS Pro B660M C D4 CSM has fewer total USB connections than the average motherboard (11 vs 15). The average motherboard has 15 total USB connections.11 vs 15
  • No BIOS flashback support
    ASUS Pro B660M C D4 CSM does not support BIOS flashback, while the average motherboard does. 50.8% of motherboards support BIOS flashback.
    requires CPU/RAM
    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 Pro B660M C D4 CSM does not support BIOS flashback, while the average motherboard does. 50.8% of motherboards support BIOS flashback.
  • 1 fewer rear USB-C ports
    ASUS Pro B660M C D4 CSM has fewer rear USB-C ports than the average motherboard (0 vs 1). The average motherboard has 1 rear USB-C port/s.
    What it is: The total number of rear USB-C ports on the motherboard.
    When it matters: When you want more USB-C devices connected without adapters.

    Importance: MEDIUM

    Good value: >=1

    ASUS Pro B660M C D4 CSM has fewer rear USB-C ports than the average motherboard (0 vs 1). The average motherboard has 1 rear USB-C port/s.0 vs 1
Total
Overall
Platform & Features
Memory
Storage
Expansion
Ports & USB
Network
Audio
Power & Cooling

Graphic comparison of ASUS Pro B660M C D4 CSM and

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Third-party reviews

United Kingdom
amazon
4.8
27 Reviews
amazon
4.5
10 Reviews
United States
Amazon_logo.png
4.8
27 Reviews
Amazon_logo.png
4.5
10 Reviews

(Reviews last updated: May 2026)

What customers like about ASUS Pro B660M C D4 CSM?

  • Excellent M.2 storage performance with confirmed PCIe 4.0 speeds
  • Supports budget-friendly DDR4 RAM instead of more expensive DDR5
  • Comprehensive enterprise features including ACCE management and BIOS customization
  • High reliability with anti-moisture coating and anti-sulfur resistors for 24/7 use
  • Includes legacy ports like PS/2 and D-Sub (VGA) which are rare on modern boards
  • Stable supply chain and long-term availability as part of the CSM program

What customers dislike about ASUS Pro B660M C D4 CSM?

  • Lacks aesthetic features like ornate heatsinks or RGB lighting
  • Limited number of fan headers (only 3), with some reports of non-BIOS controlled headers running at full speed
  • Basic green PCB design is considered 'ugly' or dated by some consumers
  • May require manual LAN driver installation during fresh OS setups
  • Lacks built-in wireless connectivity (Wi-Fi/Bluetooth) and rear USB-C ports on base models
  • Priced higher than some consumer B660 boards despite the lack of 'gamer' features

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