ASUS Pro Q870M-C-CSMUK manufacturer specification · Pro Q870M-C-CSM- Chipset
- Intel® Q870 ChipsetThis one: Intel® B860 Chipset
MOTHERBOARDS
ASUS PRIME B860M-A-CSM
UK manufacturer specification
- CPU socket
- LGA1851
- Chipset
- Intel® B860 Chipset
- Form factor and dimensions
- micro-ATX Form Factor 9.6 inch x 9.6 inch (24.4 cm x 24.4 cm)
PRIME B860M-A-CSM motherboard, identified in the ASUS UK catalogue. Specifications below retain the manufacturer’s configuration and interface conditions.
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THE ACTUAL PRODUCT
Compare with ASUS Pro Q870M-C-CSM
Specifications checked 17 Oct 2026Manufacturer specifications, not a hands-on test.
The nearest checked motherboards by key specifications, with what differs from the ASUS PRIME B860M-A-CSM. The first matches the Compare button above.
ASUS Pro Q870M-C-CSMUK manufacturer specification · Pro Q870M-C-CSM
ASUS Pro Q870M-C V2-CSMUK manufacturer specification · Pro Q870M-C V2-CSM- Chipset
- Intel® Q870 ChipsetThis one: Intel® B860 Chipset
ASUS EX-B860M-V5 PLUSUK manufacturer specification · EX-B860M-V5 PLUS- Form factor and dimensions
- micro-ATX Form Factor 9.6 inch x 8.75 inch ( 24.4 cm x 22.2 cm )This one: micro-ATX Form Factor 9.6 inch x 9.6 inch (24.4 cm x 24.4 cm)
Key strengths
Published motherboard interfaces and configuration are available from the exact-model ASUS specification source.
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.
Works with
Products in this catalogue that list the same socket or memory type as the ASUS PRIME B860M-A-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.
Start a build with thisOpens My setups with the ASUS PRIME B860M-A-CSM in place and checks each part you addEvery specification. With its source.
Full specifications
Exact configuration: UK manufacturer specification · PRIME B860M-A-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
Memory
1 item
- Memory type, slots and limit
- 4 x DIMM slots, max. 256GB, DDR5 Supports up to 8666+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 5.0 x16 slot Intel® B860 Chipset** 1 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.Source
Storage
1 item
- Storage interfaces and restrictions
- Total 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) Intel®B860 Chipset M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 modes) 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 8 ports) 1 x USB 20Gbps port (1 x USB Type-C® with DP Alt mode) 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)** Front USB (Total 5 ports) 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 *USB Type-C® power delivery output: max. 5V/3A **USB_E1 port, USB_E2 port, USB_E3 port and USB_E4 port share the bandwidth.Source
- Rear-panel ports
- 1 x USB 20Gbps port (1 x USB Type-C® with DP Alt mode) 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 Realtek 2.5Gb Ethernet port 3 x Audio jacksSource
Networking
1 item
- Network interfaces and requirements
- 1 x Realtek 2.5Gb Ethernet ASUS LANGuardSource
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 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 additionalUSB 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 Panel Audio header (F_AUDIO) 1 x S/PDIF Out header 1 x SPI TPM header (14-1 pin) 1 x 10-1 pin Front System Panel header 1 x Thunderbolt™ (USB4®) 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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