ASUS Prime B860M-A WIFI-CSM M-ATX Motherboard
MPN PRIME-B860M-A-WIFI-CSM · Brand ASUS · mATX
The ASUS Prime B860M-A WIFI-CSM is a Micro-ATX motherboard for Intel Core Ultra Series 2 processors (LGA1851), featuring the B860 chipset, DDR5 memory support up to 256 GB, PCIe 5.0, WiFi 6E, Bluetooth 5.3, and a USB 20 Gbps Type-C rear port
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Overview
The ASUS Prime B860M-A WIFI-CSM is a Micro-ATX motherboard built on the Intel B860 chipset, designed for Intel Core Ultra Processors (Series 2) in the LGA1851 socket. It is an ideal platform for system builders who want reliable performance, modern connectivity, and AI-ready capability in a compact form factor. Memory support centres on DDR5 technology with dual-channel operation, accepting up to 256 GB of non-ECC, unbuffered DDR5 RAM. ASUS Enhanced Memory Profile III (AEMP III) enables advanced memory tuning through a two-phase optimisation process covering clock driver and memory frequency, supporting speeds up to DDR5-8666+ MT/s with compatible CUDIMMs. Intel XMP is also supported, and the DIMM Fit BIOS feature analyses individual modules to improve compatibility and stability. Storage is handled by two M.2 Key-M slots: one operating via PCIe 5.0 for sequential transfer speeds of up to 128 Gbps, and one via PCIe 4.0 delivering up to 64 Gbps. Four SATA 6 Gb/s ports add further drive capacity. Expansion is provided by one PCIe 5.0 x16 slot (from the CPU), one PCIe 4.0 x16 slot running in x4 mode, and one PCIe 4.0 x1 slot (both from the B860 chipset). Wireless connectivity includes built-in WiFi 6E with access to the 2.4 GHz, 5 GHz, and 6 GHz bands, paired with Bluetooth 5.3. The wired LAN port uses a Realtek 2.5 Gb Ethernet controller. The rear I/O panel features one USB Type-C port at 20 Gbps, one USB Type-A at 10 Gbps, two USB Type-A ports at 5 Gbps, four USB 2.0 Type-A ports, two DisplayPort outputs, one HDMI port, and three audio jacks. Internal connectors include a USB 10 Gbps Type-C header, a USB 5 Gbps header (supporting two additional ports), a USB 2.0 header (two additional ports), three Addressable Gen 2 RGB headers, one Aura RGB header, and a Thunderbolt (USB4) header. Thermal management is supported by onboard heatsinks and multiple fan headers: one 4-pin CPU fan, one 4-pin CPU OPT, one 4-pin AIO pump, and three 4-pin chassis fan headers. ASUS Fan Xpert 2+ software provides manual and automatic fan curve control, including an Extreme Quiet mode. Building is simplified by DIY-friendly features such as a pre-mounted I/O shield, Q-Antenna for tool-free WiFi antenna installation, Q-LED Core POST diagnostic indicators, and a reinforced SafeSlot PCIe 5.0 primary slot. Software support includes ASUS DriverHub, Armoury Crate with Aura Sync RGB, ASUS GlideX, and a full UEFI BIOS with intuitive and advanced modes. Key Verified Specifications: - Socket: LGA1851 - Chipset: Intel B860 - Form Factor: Micro-ATX - Memory: DDR5, Dual Channel, up to 256 GB, up to DDR5-8666+ MT/s - Storage: 2 x M.2 (PCIe 5.0 128 Gbps + PCIe 4.0 64 Gbps), 4 x SATA 6 Gb/s - Expansion: 1 x PCIe 5.0 x16, 1 x PCIe 4.0 x16 (x4), 1 x PCIe 4.0 x1 - Networking: WiFi 6E, Bluetooth 5.3, Realtek 2.5 Gb Ethernet - Rear USB: 1 x USB-C 20 Gbps, 1 x USB-A 10 Gbps, 2 x USB-A 5 Gbps, 4 x USB 2.0 - Video Output: 2 x DisplayPort, 1 x HDMI - Warranty: 3 Years
Datasheet
| Memory Type | DDR5 |
|---|---|
| Form Factor | mATX |
| Chipset | B860 |
| Socket | LGA1851 |
| Platform | INTEL |
| Warranty | 3 Years |
| CPU Type | Core Ultra |
| Max Memory | 256 GB |
| Memory Speed | up to 8666+ |
| Graphics Port | 2 x DisplayPort,1 x HDMI |
| Memory Feature | 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 Brand Site. * 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 |
| Expansion Slots | 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 Brand Site for the list of supported peripherals |
| Channel Supported | Dual Channel |
| Wireless Networking | WiFi 6E,Bluetooth 5.3 |
| Back Panel I/O Ports | 1 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 |
| Internal I/O Connector | 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 1 x 24-pin Main Power connector 1 x 8-pin +12V CPU Power connector 2 x M.2 slots (Key M) 4 x SATA 6Gb/s 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 additionalUSB 2.0 ports 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®) header |
