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MOTHERBOARDS

ASUS B860M-E-CSM

Global manufacturer specification

CPU socket
LGA1851
Chipset
Intel® B860 Chipset
Form factor and dimensions
micro-ATX Form Factor 9.6 inch x 8.75 inch ( 24.4 cm x 22.2 cm )

B860M-E-CSM motherboard, identified in the ASUS Global catalogue. Specifications below retain the manufacturer’s configuration and interface conditions.

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THE ACTUAL PRODUCT
ASUS B860M-E-CSM official product image
Official product image · Image source detailsProduct imagery does not establish a retailer’s bundle or condition.
Compare with ASUS PRIME H810M-A-CSM
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Specifications checked 17 Oct 2026Manufacturer specifications, not a hands-on test.

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Key strengths

Published motherboard interfaces and configuration are available from the exact-model ASUS specification source.

Manufacturer source
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Before you buy

Compatibility and maximum operating modes depend on the source’s stated hardware, firmware and connection requirements; manufacturer figures are not independent measurements.

Manufacturer source
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Works with

Products in this catalogue that list the same socket or memory type as the ASUS B860M-E-CSM. A shared socket or memory type is necessary but not sufficient: check the exact CPU and memory support lists, and the BIOS version, before buying.

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Every specification. With its source.

Full specifications

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Exact configuration: Global manufacturer specification · B860M-E-CSM

13 specifications in 9 groups. Values are manufacturer specifications unless a row says “Measured result” or “Calculated from cited specifications”.

Platform & board

3 items
CPU socket
LGA1851Source
Chipset
Intel® B860 ChipsetSource
Form factor and dimensions
micro-ATX Form Factor 9.6 inch x 8.75 inch ( 24.4 cm x 22.2 cm )Source

Memory

1 item
Memory type, slots and limit
2 x DIMM slots, max. 128GB, DDR5 Supports up to 8800+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/. Adjustments will be made based on the specifications of mass-produced memory products available on the market. **Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.Source

Expansion slots

1 item
Expansion slots and restrictions
Intel® Core™ Ultra Processors (Series 2) 1 x PCIe 4.0 x16 slot Intel® B860 Chipset 2 x PCIe 4.0 x1 slots - To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.Source

Storage

1 item
Storage interfaces and restrictions
Total supports 1 x M.2 slot and 4 x SATA 6Gb/s ports* Intel® Core™ Ultra Processors (Series 2) M.2 slot (Key M), type 2242/2260/2280 (supports PCIe 5.0 x4 mode) 4 x SATA 6Gb/s ports * Intel® Rapid Storage Technology supports SATA RAID 0/1/5/10.Source

USB & rear connections

2 items
USB ports and headers
Rear USB (Total 6 ports) 1 x USB 10Gbps port (1 x Type-A) 2 x USB 5Gbps ports (2 x Type-A) 3 x USB 2.0 ports (3 x Type-A) Front USB (Total 7 ports) 1 x USB 5Gbps connector (supports USB Type-C®) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports * USB Type-C® power delivery output: max. 5V/3A ** USB_E2 port, USB_E3 port and USB_E4 port share the bandwidth.Source
Rear-panel ports
1 x USB 10Gbps port (1 x Type-A) 2 x USB 5Gbps ports (2 x Type-A) 3 x USB 2.0 ports (3 x Type-A) 1 x HDMI™ port 1 x Realtek 2.5Gb Ethernet 3 x Audio jacksSource

Networking

1 item
Network interfaces and requirements
1 x Realtek 2.5Gb Ethernet ASUS LANGuard; M.2 slot only (Key E, CNVi & PCIe)* * Wi-Fi module is sold separately.Source

Audio

1 item
Audio interfaces
Realtek 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.Source

Power, cooling & lighting

1 item
Internal headers and connectors
Fan and Cooling Related 1 x 4-pin CPU Fan header 2 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 1 x M.2 slot (Key M) 4 x SATA 6Gb/s ports USB 1 x USB 5Gbps connector (supports USB Type-C®) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports Miscellaneous 1 x Clear CMOS header 1 x Front Panel Audio header (F_AUDIO) 1 x M.2 slot (Key E) 1 x S/PDIF Out header 1 x 10-1 pin Front Panel System headerSource

BIOS, software & diagnostics

2 items
CPU support and BIOS requirements
Support 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. BIOS: 256 (128+128) Mb Flash ROM, UEFI AMI BIOS

Exact CPU support and BIOS revision depend on the processor and the current ASUS CPU support list; the family statement is not a guarantee for every processor.

Source
Listed operating systems
Windows 11 (22H2 & later), Windows 10 64-bit (21H2 & later)Source
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