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PRIME B860M-K
PRIME B860M-K motherboard front view, floating in space.

B860M-K

ASUS PRIME series motherboards are expertly engineered to unleash the full potential of the latest Intel® Core™ Ultra Processors (Series 2). Boasting a robust power design, comprehensive cooling solutions and intelligent tuning options, the PRIME B860M-K motherboard provides users and PC DIY builders with a range of performance optimizations via intuitive software and firmware features. It’s designed to be Advanced AI PC-ready, offering the power and connectivity needed for demanding AI applications.
Advanced AI PC ready logo
Intel Core Ultra Processor badge
Intel B860 Chipset badge
Logo depicting power stages

6+1+1+1

phase digital power design
DDR5 logo

AEMP III

for enhanced DDR5 performance
USB 10Gbps Type-A logo

USB 10Gbps Type-A

for rapid data transmission
AI Solutions logo

AI Solutions

for advanced AI capabilities
USB 5Gbps logo

USB 5Gbps Type-C®

for rapid data transmission
PCIe 5.0 M.2 logo

PCIe 5.0 M.2

for storage
EZ PC DIY logo

EZ PC DIY

for easier build customization
2.5Gb Ethernet icon

2.5Gb Ethernet

for faster data transfers
Aura Sync logo

Aura Sync

for full RGB lighting control

Performance

AI Solutions

ASUS AI Solutions include AI Advisor as your technical expert with expertise in PC performance.

AI Advisor

ASUS AI Advisor allows users to explore the functionality and advanced features of ASUS motherboards in a simple and straightforward way.1

UI showing that AI Advisor can be interacted using natural language.

Performance

Digital Power Design

Stable power is crucial for maximizing the performance of Intel® Core™ Ultra Processors (Series 2).The PRIME B860M-K features an 6+1+1+1 phase design with discrete MOSFETs,ensuring efficient and stable power delivery for Intel® processors plus steady performance for day-to-day use.
6
VCCCORE power
1
VCCGT power
1
VCCSA power
1
VNNAON power
Angled top-down view of PRIME B860M-K motherboard.

Enhanced Memory & Storage Performance

AEMP III for Ultimate DDR5 Performance

ASUS Enhanced Memory Profile III (AEMP III) is an advanced firmware feature that empowers users to achieve unparalleled memory performance with cutting-edge CUDIMM memory. Through a two-phase comprehensive tuning process, AEMP III first optimizes the clock driver and then the memory frequency. This results in the best balance between performance and stability, even at cutting-edge speeds of DDR5-7600 or higher.2
Graphic depicting RAM speeds.

DIMM Fit / DIMM Fit Pro

DIMM Fit is an ASUS-exclusive Bioses feature that precisely analyzes individual memory modules to optimize performance and pinpoint potential issues. DIMM Fit Pro gives advanced PC builders more extensive customizability for memory tuning. It allows users to control up to twenty overclocking parameters, define testing ranges, and prioritize stability or performance, offering a more flexible and granular approach to memory optimization.
Learn more about DIMM Fit Pro
Graphic marking the locations of DIMMs and showing the UI of the feature DIMM Fit / DIMM Fit Pro.

Two M.2 slots (up to 128Gbps)

PRIME B860M-K offers a total of two M.2 slots, including one that supports data-transfer speeds of up to 128Gbps via PCIe 5.0, one that supports 64Gbps via PCIe 4.0. This enables quicker boot-up and app load times with OS or application drives.3
Graphic depicting different M.2 slots on a motherboard.

Cooling

Cooler by design

The PRIME B860M-K motherboard is engineered with multiple onboard heatsinks and an array of hybrid fan headers to help ensure your rig stays cool and stable under intense workloads.
PRIME B860M-K front view.

VRM heatsinks and thermal pads

The VRM heatsinks and thermal pads improve heat transfer from the MOSFETs for better cooling performance.

4-Pin PWM/DC fan

Each onboard header supports auto-detection of PWM or DC fans.

Multiple temperature sources

Each header can dynamically reference three thermal sensors. Fan Xpert 2+ lets you to map the temperature of supported ASUS graphics cards to optimize cooling for GPU- and CPU-intensive tasks.

Passive chipset heatsink

An aluminum passive chipset heatsink ensures optimal cooling and stable performance. It is more durable and longer-lasting than heatsinks with fans, which can be vulnerable to the buildup of dust and debris.

Smart protection

A dedicated integrated circuit protects each fan header from overheating and excess current.

Cooling

Smart cooling precision

ASUS Fan Xpert 2+

ASUS Fan Xpert 2+ software provides comprehensive control over fans. An Auto-Tuning mode intelligently configures all parameters with a single click. There’s also an Extreme Quiet mode that reduces chassis fan speeds to below the default minimum to keep your system whisper-quiet when performing light tasks. Fans can also be controlled via the UEFI Bioses.4
UI for Fan Xpert 2+

Flexibility

Empowering connections

This motherboard offers a versatile range of connectivity, including support for PCIe 5.0 M.2, PCIe 4.0 slot and an arsenal of USB ports which includes Type-C® connection.
Realtek 2.5Gb Ethernet logo

2.5Gb Ethernet

USB 10Gbps Type-A logo

USB 10Gbps Type-A

PCIe 5.0 M.2 logo

PCIe 5.0 M.2

PCIe 4.0 slot logo

PCIe 4.0 slot

USB 5Gbps logo

USB 5Gbps

Realtek 2.5Gb Ethernet

Realtek 2.5Gb Ethernet reduces CPU overhead and offers exceptionally high TCP and UDP throughput for faster, smoother data transfers.
Realtek 2.5Gb Ethernet

USB 5Gbps Type-C®

A batch of USB ports support high-end rigs loaded with peripherals, including a front USB Type-C® connector with ultrafast USB 5Gbps for transmission speeds of up to 5Gbps.
USB 5Gbps Type-C®

Customization

Personalization

The PRIME B860M-K enhances the user experience across the board, from simplifying Bioses setting adjustments to offering customizable RGB lighting controls for a uniquely personal system aesthetic.

UEFI Bioses

The UEFI interface delivers easy-to-use configuration options for PC beginners, and advanced features for veterans.

UEFI Bioses advanced mode UI.

ASUS DriverHub

Simplify driver management with automatic detection, one-click installation and update for smooth, efficient system performance.

ASUS DriverHub UI

Armoury Crate

Customize Aura Sync RGB and control ASUS devices. Includes product registration and updates.

ASUS Armoury Crate UI

Aura Sync

Complete RGB lighting control for enthusiast systems, ensuring seamless synchronization with compatible hardware.

ASUS Aura Sync Logo

Addressable Gen2 RGB headers

Two Addressable Gen2 headers detect LED counts on compatible RGB devices, automatically adjusting lighting effects accordingly.

Image depicting PRIME B860M-K ARGB connectors.

Customization

DIY friendly

The PRIME B860M-K motherboard features EZ PC DIY innovations that simplify and speed up the PC building process, making DIY easy and convenient.
  1. Availability of ASUS AI Advisor may vary by region.
    AI Advisor functions may vary by platform. ↑
  2. Results may vary according to individual system specifications. Results are based on a test with an Intel Core Ultra 9 285K processor and 2x16GB SK Hynix DDR5-6400 Clocked Unbuffered DIMM RAM, model HMCG78AHBCA326N.↑
  3. Actual transmission speeds will be lower than the theoretical maximum speed.↑
  4. Image(s) for reference only.↑
  5. Video(s) for reference only.↑
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Product has High-Definition Multimedia Interface.

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  • Specifications and features vary by model, and all images are illustrative. Please refer specification pages for full details.
  • *Precise specifications and features vary by model . Please refer to the specification page
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