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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

  • 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

Option PRIME B860M-A WIFI-CSM

Struck-through versions exist but are not stocked here.

  • 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.

Highlights

  • 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

Specifications

BrandASUS
SeriesPrime
ModelPRIME B860M-A WIFI-CSM
Part Number90MB1JY0-M0AAYC
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
Shipping weight1.20 kg
Package size279 × 279 × 76 mm

Other versions of this model

3 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

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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