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ASUS PRIME B860M-A WIFI motherboard and Intel Ultra 9 285K processor in retail packaging

ASUS

ASUS PRIME B860M-A WIFI-CSM Intel Motherboard & Ultra 9 285K Combo

SKU CH-6RXD-MT9VE

A motherboard and CPU bundle ready for Intel Core Ultra Series 2 processors, with DDR5 memory up to 8400 MT/s, PCIe 5.0 graphics support, WiFi 6E, and 2.5 Gb Ethernet

  • CPU Socket TypeLGA 1851
  • CPU TypeSupport Intel® Core™ Ultra Processors (Series 2) , LGA1851*
  • ChipsetIntel B860
  • Number of Memory Slots4x288pin (DDR5)
  • Memory Standard4 x DIMM slots, max. 192GB, DDR5 Supports up to 8400+MT/s (O
  • Maximum Memory Supported192GB

model PRIME B860M-A WIFI

+CPU +Ultra 9 285K

  • AI-ready platform with Intel Core Ultra 9 285K processor
  • Robust 80A DrMOS power delivery for stable performance
  • PCIe 5.0 x16 and M.2 slots for high-speed expansion
  • WiFi 6E and 2.5Gb Ethernet for fast networking
  • Up to 192GB DDR5 memory with 8400+ MT/s support

Combo Purpose

This bundle pairs an ASUS PRIME B860M-A WIFI-CSM motherboard with an Intel Core Ultra 9 285K processor and Shin-Etsu thermal grease. It is built for system integrators and enthusiasts who want a single validated kit for an LGA 1851 platform without sourcing parts separately.

Audience Fit

The kit suits builders targeting AI-accelerated workloads and high-thread productivity on a micro-ATX form factor. It is not aimed at users needing extended PCIe lane counts, workstation-grade remote management or a larger ATX board with additional expansion slots.

Deciding Spec

The motherboard delivers a 7+1+1+1 phase 80A DrMOS power design with an 8-pin ProCool connector to support the processor 125W base power. This VRM layout is the key figure that determines whether the board can sustain the CPU under prolonged heavy loads.

Highlights

  • AI-ready platform with Intel Core Ultra 9 285K processor
  • Robust 80A DrMOS power delivery for stable performance
  • PCIe 5.0 x16 and M.2 slots for high-speed expansion
  • WiFi 6E and 2.5Gb Ethernet for fast networking
  • Up to 192GB DDR5 memory with 8400+ MT/s support

Specifications

BrandASUS
SeriesPrime
ModelPRIME B860M-A WIFI+Ultra 9 285K
Part NumberPRIME B860M-A WIFI+Ultra 9 285K
CPU Socket TypeLGA 1851
CPU TypeSupport Intel® Core™ Ultra Processors (Series 2) , LGA1851*
Supports Intel® Turbo Boost Technology 2.0 and Intel® Turbo Boost Max Technology 3.0**
* Refer to https://www.asus.com/support/download-center/ for CPU support list.
** Intel® Turbo Boost Max Technology 3.0 support depends on the CPU types.
ChipsetIntel B860
Number of Memory Slots4x288pin (DDR5)
Memory Standard4 x DIMM slots, max. 192GB, DDR5
Supports up to 8400+MT/s (OC), Non-ECC,Un-buffered ,Clocked Unbuffered DIMM (CUDIMM)*
Dual channel memory architecture
DIMM Fit
Supports Intel® Extreme Memory Profile (XMP) memory module
ASUS Enhanced Memory Profile III(AEMPIII)
* Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information please refer to CPU/Memory Support list under the Support tab of product information site or visit https://www.asus.com/support/download-center/.
* Non-ECC, un-buffered DDR5 memory su
Maximum Memory Supported192GB
Channel SupportedDual Channel
PCI Express 5.0 x161 x PCI Express 5.0 x16
PCI Express 4.0 x161 x PCIe 4.0 x16 slot (supports x4 mode)
1 x PCIe 4.0 x1 slot
- To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.
Serial ATA (SATA)4 x SATA 6Gb/s
M.2Total supports 2 x M.2 slots and 4 x SATA 6Gb/s ports*
Intel® Core™ Ultra Processors (Series 2) *
M.2_1 slot (Key M), type 2242/2260/2280 (supports PCIe 5.0 x4 mode)
SATA RAID0/1/5/10
Audio ChannelsRealtek 7.1 Surround Sound High Definition Audio CODEC*
- Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking
- Supports up to 24-Bit/192 kHz playback
Audio Features
- Audio Shielding
- Premium audio capacitors
- Dedicated audio PCB layers
** A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.
Max LAN Speed1 x Realtek 2.5Gb Ethernet
ASUS LANGuard
Wireless LANWi-Fi 6E
2x2 Wi-Fi 6E (802.11ax)
Supports 2.4/5/6GHz frequency band*
Bluetooth® v5.3**
* WiFi 6E 6GHz regulatory may vary between countries, supported only in Windows 11 or later
** The Bluetooth® version may vary, please refer to the Wi-Fi module manufacturer's website for the latest specifications.
BluetoothYes
Back I/O Ports1 x USB 20Gbps port (1 x USB Type-C®)
1 x USB 10Gbps port (1 x Type-A)
2 x USB 5Gbps ports (2 x Type-A)
4 x USB 2.0 ports (4 x Type-A )
2 x DisplayPort
1 x HDMI™ port
1 x Wi-Fi module
1 x Realtek 2.5Gb Ethernet port
3 x Audio jacks
Other ConnectorsFan and Cooling Related
1 x 4-pin CPU Fan header
1 x 4-pin CPU OPT Fan header
1 x 4-pin AIO Pump header
3 x 4-pin Chassis Fan headers
Power Related
1 x 24-pin Main Power connector
1 x 8-pin +12V CPU Power connector
Storage Related
2 x M.2 slots (Key M)
4 x SATA 6Gb/s ports
USB
1 x USB 10Gbps connector (supports USB Type-C® )
1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
1 x USB 2.0 header supports 2 additional USB 2.0 ports
Miscellaneous
3 x Addressable Gen 2 headers
1 x Aura RGB header
1 x Clear CMOS header
1 x Chassis Intrusion header
1 x COM Port header
1 x Front Pane
Windows 11Windows 11 (22H2 & later), Windows 10 64-bit(21H2 & later)
Form FactorMicro ATX
Dimensions (W x L)9.6 inch x 9.6 inch (24.4 cm x 24.4 cm)
FeaturesASUS 5X PROTECTION III
- DIGI+ VRM (- Digital power design with DrMOS)
- ESD Guards
- LANGuard
- Overvoltage protection
- Stainless-steel back I/O
ASUS Q-Design
- Q-Antenna
- Q-Dashboard
- Q-DIMM
- Q-LED Core
- Q-Slot
ASUS Thermal Solution
- M.2 heatsink
- VRM heatsink design
ASUS EZ DIY
- ProCool
- Pre-mounted I/O shield
Aura Sync
- Aura RGB header
- Addressable Gen2 headers

Other versions of this model

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Questions about this item

Will the 125W Ultra 9 285K throttle under sustained load with the 7+1+1+1 80A DrMOS VRM and enlarged heatsinks?

The 7+1+1+1 80A DrMOS power stages with alloy chokes, durable capacitors and enlarged VRM heatsinks are designed to deliver stable power for the 125W processor during extended workloads.

How loud and hot does the VRM area get when the 125W CPU runs all day with Fan Xpert 2+ controlling hybrid fan headers?

Fan Xpert 2+ manages hybrid fan headers and enlarged VRM heatsinks to balance airflow and noise, while the 80A DrMOS stages run efficiently to limit heat buildup during continuous operation.

Besides the included Shin-Etsu X-23-7868-2D grease, what cooler mounting hardware must I already own for the LGA 1851 socket?

You need an LGA 1851-compatible CPU cooler; the motherboard provides the socket and back-plate, but the cooler itself is not included in the combo.

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