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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

  • ProcessorSupport Intel® Core™ Ultra Processors (Series 2) , LGA1851*
  • ChipsetIntel B860
  • Form factorMicro ATX
  • CPU socketLGA 1851
  • Memory slot count4 × 288pin (DDR5)
  • Supported memory4 x DIMM slots, max. 192 GB, DDR5 Supports up to 8400+MT/s (

Model PRIME B860M-A WIFI

Show 3 more

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.

How it compares

Measured against everything we stock in Motherboards for Intel CPUs, at today’s prices. Recalculated every night.

Price $1,052.99
Pricier than about 93% of the 2,965 comparable items (median $97.99).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameASUS
Product linePrime
Model namePRIME B860M-A WIFI+Ultra 9 285K
Part numberPRIME B860M-A WIFI+Ultra 9 285K
Processor
CPU socketLGA 1851
ChipsetIntel B860
Memory
Memory slot count4 × 288pin (DDR5)
Max supported RAM192 GB
Memory channelsDual Channel
Storage
SATA ports4 x SATA 6Gb/s
M.2 slotsTotal 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 and RAID support0/1/5/10
Audio & video
Sound 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.
Connectivity
Maximum network speed1 x Realtek 2.5Gb Ethernet
ASUS LANGuard
Wi-Fi standardWi-Fi 6E
2 × 2 Wi-Fi 6E (802.11ax)
Supports 2.4/5/6 GHz frequency band*
Bluetooth® v5.3**
* WiFi 6E 6 GHz 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.
Bluetooth supportYes
Ports & slots
PCIe 5.0 x16 slots1 x PCI Express 5.0 x16
PCIe 4.0 x16 slots1 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.
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in (24.4 cm × 24.4 cm)
Compatibility
Windows 11 support(22H2 & later), Windows 10 64-bit(21H2 & later)

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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