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ASUS PRIME B860M-A WIFI-CSM mATX motherboard in black with silver heatsinks and rear I/O panel

ASUS

ASUS PRIME B860M-A WIFI-CSM Intel motherboard

SKU CH-1CX7-5GMNV MPN PRIME B860M-A WIFI-CSM

mATX board for Intel Core Ultra Series 2 with DDR5 up to 192 GB, PCIe 5.0 x16, Wi-Fi 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-CSM

  • Ready for Intel Core Ultra Series 2 processors with LGA 1851 socket
  • Robust 7+1+1+1 80A DrMOS power stages and ProCool 8-pin connector for stable delivery
  • PCIe 5.0 x16 slot plus PCIe 5.0 M.2 with heatsink for fastest graphics and storage
  • Wi-Fi 6E and Realtek 2.5Gb Ethernet with ASUS LANGuard for high-performance networking
  • DDR5 up to 8400 MT/s across four slots supporting 192GB dual-channel memory

LGA 1851 micro-ATX motherboard

The ASUS PRIME B860M-A WIFI-CSM is an Intel B860 micro-ATX board built for Intel Core Ultra Series 2 processors in the LGA 1851 socket. It delivers a 7+1+1+1 80A DrMOS power design with an 8-pin ProCool connector, alloy chokes and durable capacitors for stable delivery. Four DDR5 DIMM slots support up to 192GB in dual-channel mode with speeds up to 8400+ MT/s when overclocked.

Suited for AI-ready workstations and stable

This model fits builders who need a Corporate Stable Model platform with Wi-Fi 6E, 2.5Gb Ethernet and a rear USB 20Gbps Type-C port for fast peripherals. It also provides a front USB 10Gbps Type-C header and four SATA 6Gb/s ports with RAID 0/1/5/10 support. Users requiring more than two M.2 slots or a full-size ATX layout should consider other form factors.

PCIe 5.0 x4 M.2 slot with heatsink

The primary M.2_1 slot accepts 2242, 2260 and 2280 drives at PCIe 5.0 x4 speeds and includes a dedicated heatsink. A second M.2 slot operates at PCIe 4.0 x4. The single PCIe 5.0 x16 slot handles modern graphics cards, while a PCIe 4.0 x16 slot runs at x4 mode and a PCIe 4.0 x1 slot adds expansion flexibility.

How it compares

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

Price $125.99
Pricier than about 63% of the 2,965 comparable items (median $97.99).

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Specifications

Product
Brand nameASUS
Product linePrime
Model namePRIME B860M-A WIFI-CSM
Part number90MB1JY0-M0AAYC
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)
Shipping weight1.20 kg
Package size279 × 279 × 76 mm
Compatibility
Windows 11 support(22H2 & later), Windows 10 64-bit(21H2 & later)

Other versions of this model

3 more in the same range

Questions about this item

What size cooler mounting holes does the LGA 1851 socket use?

The board uses the Intel LGA 1851 socket which retains the standard square mounting pattern so any compatible cooler will fit.

Which power connector must be attached for the 7+1+1+1 DrMOS stages to function?

Connect the 8 pin ProCool power connector near the CPU socket; the board will not post without it.

Does the M.2 heatsink cover both the PCIe 5.0 and PCIe 4.0 slots?

Only the PCIe 5.0 M.2_1 slot includes a dedicated heatsink; the second slot runs without one.

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