Intel® B660 (LGA 1700) mATX motherboard with PCIe® 4.0, two M.2 slots, DDR4, HDMI®, D-Sub, Realtek 1Gb Ethernet, front USB 3.2 Gen 1, ASUS Lighting Control
  • Intel® LGA 1700 socket: Ready for 14th, 13th & 12th Gen Intel® processors
  • Enhanced power solution: 8-pin ProCool connector, alloy chokes and durable capacitors for stable power delivery
  • Comprehensive cooling: VRM heatsink, PCH heatsink, hybrid fan headers and Fan Xpert
  • Ultrafast connectivity: PCIe® 4.0, two M.2 slots and front USB 3.2 Gen 1
  • ASUS Control Center Express: Real-time IT monitoring and management software for enhanced data protection
PRIME B660M-K D4-CSM
PRIME B660M-K D4-CSM motherboard, front view
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ASUS Prime series motherboards are expertly engineered to unleash the full potential of 14th, 13th & 12th Generation Intel® processors. Boasting a robust power design, comprehensive cooling solutions and intelligent tuning options, PRIME B660M-K D4-CSM provides users and PC DIY builders a range of performance tuning options via intuitive software and firmware features.


Core i9 processor icon , Intel B660 Chipset icon , Windows 11 icon
PRIME Motherboard product image PRIME Motherboard product image

  • 2 x USB 2.0 ports (type-A)

  • 1 x HDMI® port

  • 1 x D-Sub port

  • 4 x USB 3.2 Gen 1 ports (Type-A)

  • Realtek 1Gb Ethernet

  • 3 x Audio Jacks

  • Expansion Slots
    ・1 x PCIe 4.0/3.0 x16 slot
    ・2 x PCIe 3.0 x1 slots

  • 1 x RGB heatsink

  • 2 x DIMM
    DDR4 5333(OC)

  • Intel® Socket LGA1700 for Intel® Core™ 14th & 13th Gen Processors, Intel® Core™ 12th Gen, Pentium® Gold and Celeron® Processors

  • 1 x USB 3.2 Gen 1 header

  • 2 x M.2 slots
    ・M.2_1 slot (Key M) 2280 (PCIe 4.0 x4 mode)
    ・M.2_2 slot (Key M) 2280 (PCIe 4.0 x4 mode)

  • 4 x SATA 6Gb/s ports

  • 2 x USB 2.0 headers

ASUS Corporate Stable Model



ASUS Corporate Stable Model (CSM) is a commercial program designed to provide stable and reliable motherboards. Offering up to 36-month product lifecycle support and 6-month end-of-life notice to allow sufficient lead times for your organization to get ready for product transitions. Each purchase of an ASUS CSM motherboard comes with ASUS Control Center Express - server-grade IT management software.


* Lifecycle support, program offering and supply status may vary by region. Please consult your local sales representative for more information.


Learn more about ASUS CSM program
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ASUS Control
Center Express

ASUS Control Center Express is an integrated IT monitoring and management software designed to deploy faster, simplify IT operations and improve productivity with comprehensive control and user-friendly functions. ASUS Control Center Express is compatible with over 100 ASUS motherboards to provide a high-quality, TCO-optimized solution for your business needs.


Learn more about ASUS Control Center Express
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Optimize IT endpoint management


Designed to assist IT staff in monitoring and controlling devices within their corporate networks, and facilitate inventory checking in multiple locations remotely


Automate IT maintenance


Allows IT staff to schedule automatic updates of the latest BIOS, software and utilities to specific or all devices at off-peak times, enhancing system stability and IT operational flexibility


Securely manage all of endpoints


Securely manage endpoint configuration, portable storage access and PC software applications by enabling them to create grouping rules on individual devices

FLEXIBILITY



Comprehensive controls form the foundation of the ASUS Prime series. The Prime B660 motherboard packs flexible tools to tune every aspect of your system, enabling performance tweaks to perfectly match the way you work to maximize productivity.
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Intelligent Control



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EPU icon

All-Around Energy Efficiency

The Energy Processing Unit (EPU) automatically optimizes power consumption and maximizes energy savings with Away mode — a smart setting that creates an extreme energy-saving scenario by shutting down unused I/O controllers.
Fan Xpert image

Flexible Air- and Liquid-Cooling Controls

ASUS Fan Xpert software provides comprehensive control over fan. There’s an Extreme Quiet mode that reduces fan speeds to below the default minimum to keep your system whisper-quiet when performing light tasks. Fan can also be controlled via the UEFI BIOS.
Digi+ VRM Control image

Precise Digital Power Control

The Digi+ voltage-regulator module (VRM) delivers real-time control over voltage droop, automatically switching frequency and power-efficiency settings. It also allows you to fine-tune your CPU for ultimate stability and performance.

UEFI BIOS



The renowned ASUS UEFI BIOS provides everything you need to configure, tweak and tune your system. It offers intelligently simplified options for PC DIY beginners, as well as comprehensive features for seasoned veterans.
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Advanced Tuning for Serious Tweakers



An intuitive Advanced mode offered via the UEFI lets you take complete control. A built-in search feature makes it easy to find options, and various advanced functions let you intelligently make nuanced adjustments so you can dial in performance just the way you want.

Search Function


Quickly and easily find the option or setting you need.

ASUS User Profile


Port configuration settings between different BIOS versions or share them with friends.

Quick and Simple Setup



EZ mode displays vital settings and stats and also offers guided wizards, drag-and-drop functionality, and one-click application of important settings — all to help you get your rig up and running in no time.

Intuitive Graphical Fan Control


Fine-tune individual fan settings simply by dragging a curve with the mouse.

EZ XMP


Improve DRAM performance with one click.

COOLING


Prime B660 series are engineered with multiple onboard heatsinks and an array of hybrid fan headers to ensure your rig stays cool and stable under intense workloads.

Heatsinks



VRM Heatsink and Thermal Pad



VRM heatsink and thermal pad improve heat transfer from the MOSFETs and chokes for better cooling performance.
Prime motherboard with VRM heatsink image
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Cooler by Design



Prime B660 series feature comprehensive cooling controls that are configurable via Fan Xpert software or via the UEFI BIOS.
Prime motherboard Prime motherboard with multiple temperature sources image Prime motherboard with 4-Pin PWM/DC Fan image

Multiple Temperature Sources



Each header can dynamically reference three thermal sensors. Fan Xpert allows you to map the temperature of supported ASUS graphics cards to optimize cooling for GPU- and CPU-intensive tasks.

4-Pin PWM/DC Fan



The chassis fan header supports auto-detection of PWM or DC fans.

PERFORMANCE



Prime B660 series are built to handle the additional cores and increased bandwidth of 14th, 13th & 12th Generation Intel® processors. ASUS B660 motherboards provide all the fundamentals to boost daily productivity, so your system will be ready for action with stable power, intuitive cooling and flexible transfer options.

Power Design



Stable power is essential to extract every last bit of performance out of Intel® processors. PRIME B660M-K D4-CSM is geared to cater to the demands of these high-core-count CPUs.
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ProCool Connector

ProCool Connectors

Proprietary connectors augment the motherboard's link to the PSU with 8 pin connectors that pass 12 volts of power directly to the processors. Each jack features solid pins that can handle more current than hollow-pin connectors.

6+1+1 Power Stages

A VRM with 6+1+1 Power Stages delivers the power and efficiency that the latest Intel processors demand.
ProCool Connector demo ProCool mosfets demo

Memory

DDR4 5333(OC)

DDR4 5333(OC)


Improvements to trace routing design provide the latest Intel processors with enhanced access to memory bandwidth. ASUS technology carefully maps memory signal pathways across different PCB layers to reduce path distance, and it adds shielding zones that significantly reduce crosstalk.
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Storage



Two M.2 slots (up to 64 Gbps)



PRIME B660M-K D4-CSM offers a total of two M.2 slots that support data-transfer speeds of up to 64 Gbps via PCIe® 4.0, enabling quicker boot-up and app load times with OS or application drives.


* Actual transmission speeds will be lower than the theoretical maximum speed.

Two M.2 slots

Connectivity

PCIe® 4.0 Slot image

PCIe® 4.0 Slot

PRIME B660M-K D4-CSM is designed specifically for 14th, 13th & 12th Generation Intel® CoreTM CPUs and offer PCIe® 4.0 connectivity. The wide bandwidth and superfast transmission speeds allow you to create feature-rich builds that can handle high loads effortlessly.

Realtek 1 Gb Ethernet


Realtek 1 Gb Ethernet reduces CPU overhead and offers exceptionally high TCP and UDP throughput for faster, smoother data transfer.
Lower CPU workload
High TCP and UDP throughput
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CUSTOMIZATION



Prime B660 series add the nuanced details that improve every experience, from exclusive codecs that provide pristine audio quality to intuitive RGB lighting controls that let you customize your system to create a uniquely personal look.

Audio

Combined onboard features deliver elevated audio


Intelligent design and premium hardware create audio quality unlike anything you’ve ever experienced.

Audio Shielding


Separates analog/digital signal domains, significantly reducing multi-lateral interference.

Separate Layer for Left and Right Tracks


Ensures minimal crosstalk between audio paths.

Premium Audio Capacitors


Premium parts provide an immersive sound signature, with exceptional fidelity.

Personalization

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Lighting Control RGB Header demo

Lighting Control
Brighten Up Your Build


With 5050 RGB strips connected to the RGB header, you can create your own stunning multicolor lighting displays with static, blinking, fading, and strobing effects.

* The RGB-strip header supports 5050 RGB LED strips with a max power rating of 3A (12V). For maximum brightness, strip length should not exceed 3m.
** RGB LED Strips are sold separately.

Armoury Crate


Armoury Crate is a new software utility designed to give you centralized control of supported products. From a single intuitive interface. The software also provides control of settings for an ever-growing number of ASUS products, including keyboard and mouse preferences. Armoury Crate even features dedicated product registration and news to help you stay in touch with the ASUS community.
DOWNLOAD NOW

DIY Friendly

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Q-LED Core


The Q-LED Core display produces light patterns by power LED during the Power-On Self-Test (POST) that can help users troubleshoot potential issues.
No DRAM Detected
Q-LED Core image Q-LED Core image
Fast blinking

4 Hz (0.25s)

No VGA Detected
Q-LED Core image Q-LED Core image
Slow blinking

1/2 Hz (2s)

No Boot Device Detected
Q-LED Core image Q-LED Core image
Very slow blinking

1/8 Hz (8s)

Installation Completed
Q-LED Core image Q-LED Core image
Solid light
  • SafeSlot Core image
  • detail view of strengthened solder points around the PCIe and DIMM pins

SafeSlot Core


SafeSlot Core is the ASUS-exclusive PCIe® slot. Featuring a fortified design that's anchored to the motherboard by a special hook, Safeslot Core provides 1.6X-stronger retention and 1.3X-greater shearing resistance than standard expansion slots.
LANGuard icon
LANGuard

Pumped-up throughput 2.5X higher surge tolerance
ASUS LANGuard is a hardware-level network protection feature that integrates advanced signal-coupling technology and premium anti-EMI surface-mounted capacitors to improve throughput and ensure a more reliable connection.
Overvoltage Protection icon
Overvoltage Protection

World-class circuit-protecting power design
An exclusive circuit design with built-in voltage regulators to protect your motherboard from damage caused by unexpected high-level voltages from unstable or inferior power supplies.
DRAM Overcurrent Protection icon
DRAM Overcurrent Protection

Short-circuit damage prevention
Onboard resettable fuses prevent overcurrent and short-circuit damage. This extends beyond I/O ports to DRAM to safeguard the lifespan of your system and connected devices.
Stainless-Steel Back I/O icon
Stainless-Steel Back I/O

3X corrosion-resistance for greater durability
Corrosion-resistant stainless-steel back I/O panels bonded with chromium oxide have a lifespan that's three times longer than ordinary panels.

1000+
Compatible devices and components


The Prime H670 series provides superior compatibility with thousands of components and our memory support list identifies memory compatibility, giving you more choices for worry-free PC-building experiences.

8000+
Validation hours


Every ASUS motherboard is subjected to more than 8,000 hours of stringent tests, including burn-in, environmental, compatibility, software and safety tests to confirm their durability. ASUS reliability surpasses industry standards, ensuring that every component is designed to function flawlessly in any environment.
Temperature and humidity tests icon
Temperature and humidity tests
Ensures components withstand extreme conditions.
Thermal measurement tests
Thermal measurement tests
Ensures that the system remains cool and stable under the heaviest loads.
Insertion tests icon
Insertion tests
Every port and connector is put through repeated installation cycles.
Aging tests icon
Aging tests
Up to 48-hour aging test ensures reliability.
Power-consumption tests icon
Power-consumption tests
Checked for world-class energy efficiency.
Temperature and DC margin tests icon
Temperature and DC margin tests
Ensures that the motherboard is capable of coping with voltages fluctuations caused by varying temperatures.
Thermal-shock tests icon
Thermal-shock tests
Ensures ability to survive temperature changes during transportation.
Non-operation shock tests icon
Non-operation shock tests
Built to withstand jolts that may occur during shipping.
Burn-in tests icon
Burn-in tests
Every component is checked to ensure flawless operation.
Installation tests icon
Installation tests
Connector placement is double-checked to ensure hassle-free installation.
Drop tests icon
Drop tests
Drop tests from various heights ensure durability.
Salt and spray tests icon
Salt and spray tests
Tested for I/O reliability, prolonged lifespan and rust-resistance.
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