Msi Pro B860M-S M-ATX Motherboard
MPN PRO-B860M-S · Brand MSI · mATX
The MSI PRO B860M-S is a Micro-ATX motherboard with Intel B860 chipset, LGA 1851 socket, DDR5 support up to 8800 MT/s, PCIe 5.0, and 2.5G LAN — a solid foundation for Intel Core Ultra Series 2 builds
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Overview
The MSI PRO B860M-S is a Micro-ATX motherboard built on the Intel B860 chipset with an LGA 1851 socket, designed to support Intel Core Ultra Series 2 processors. Its compact Micro-ATX form factor makes it an efficient choice for space-conscious builds without sacrificing modern connectivity or expansion options. At the heart of its memory subsystem is support for DDR5 RAM in dual-channel configuration, reaching speeds of up to 8800 MT/s under overclocking. It is compatible with Intel XMP 3.0 profiles and CUDIMM modules, and supports non-ECC unbuffered memory up to a maximum of 128 GB across its DIMM slots, which feature double-sided latches for secure seating. For storage and expansion, the board includes one PCIe 5.0 x16 slot sourced directly from the CPU, suitable for the latest discrete graphics cards, and one PCIe 4.0 x1 slot from the chipset. An M.2 slot supporting Lightning Gen 4 x4 speeds enables fast NVMe SSD connectivity. Networking is handled by an onboard 2.5G LAN controller, providing a stable and responsive wired connection for both professional workloads and media-intensive tasks. The rear I/O panel includes HDMI and DisplayPort outputs for display connectivity, multiple USB 2.0 ports, USB 5Gbps Type-A, and a suite of audio connectors backed by MSI's Audio Boost technology for improved sound clarity. Internal headers include connectors for CPU fans, system fans, front panel audio (JAUD), chassis intrusion detection (JCI), TPM 2.0 support, four USB 2.0 ports, two USB 5Gbps Type-A ports, one USB 5Gbps Type-C port, and three Addressable V2 RGB LED connectors (JARGB_V2) for system lighting customisation. MSI's EZ PCIe Clip II on the primary slot employs a rebounding latch mechanism, allowing graphics card removal with a single finger press — a practical quality-of-life feature in tighter case environments. EZ DEBUG LEDs and EZ Memory Detection LEDs provide onboard diagnostic indicators to simplify troubleshooting during initial builds or hardware changes. Protection features include Transient Voltage Suppressors (TVS) to guard against voltage spikes and embedded Overcurrent Protection (OCP) covering USB ports, DDR slots, PWM IC, and the CPU. The PCH heatsink is engineered for efficient thermal dissipation with reduced dust accumulation. Screw holes are surrounded by protective paint to prevent PCB damage during installation. The board carries a 3-year manufacturer warranty. — Verified Specifications — Socket: LGA 1851 Chipset: Intel B860 Form Factor: Micro-ATX CPU Compatibility: Intel Core Ultra Series 2 Memory Type: DDR5 (Non-ECC, Unbuffered, CUDIMM supported) Memory Slots: Dual Channel Max Memory: 128 GB Memory Speed: Up to 8800 MT/s (OC); Intel XMP 3.0 supported PCIe Slots: 1x PCIe 5.0 x16 (CPU), 1x PCIe 4.0 x1 (Chipset) Display Output: 1x HDMI, 1x DisplayPort LAN: 2.5G Rear USB: USB 5Gbps Type-A, USB 2.0 (multiple) Internal USB: 4x USB 2.0, 2x USB 5Gbps Type-A, 1x USB 5Gbps Type-C RGB Headers: 3x Addressable V2 (JARGB_V2) TPM: TPM 2.0 header Warranty: 3 Years
Datasheet
| Warranty | 3 Years |
|---|---|
| Form Factor | mATX |
| Chipset | B860 |
| Socket | LGA1851 |
| CPU Type | Core Ultra |
| Max Memory | 128 GB |
| Memory Speed | up to 8800 |
| Platform | INTEL |
| Graphics Port | 1x HDMI,1x DisplayPort |
| Memory Feature | Supports Intel POR Speed and JEDEC Speed Supports Memory Overclocking and Intel XMP 3.0 Supports Dual-Controller Dual-Channel mode Supports Non-ECC, Un-buffered memory Supports CUDIMM The DIMM slots on this motherboard have double-sided latches. Memory compatibility and supported speeds can vary depending on the CPU and memory configuration. For detailed information, please refer to the Memory Compatibility List available on the product’s Support page or visit Brand website |
| Expansion Slots | 1x PCI-E x16 slot 1x PCI-E x1 slot PCI_E1 Gen PCIe 5.0 supports up to x16 (From CPU) PCI_E2 Gen PCIe 4.0 supports up to x1 (From Chipset) |
| Channel Supported | Dual Channel |
| Back Panel I/O Ports | DisplayPort USB 5Gbps Type-A USB 2.0 2.5G LAN Audio Connectors HDMI USB 2.0 |
| Internal I/O Connector | 1x Power Connector(ATX_PWR) 1x Power Connector(CPU_PWR) 1x CPU Fan 2x System Fan 2x Front Panel (JFP) 1x Chassis Intrusion (JCI) 1x Front Audio (JAUD) 3x Addressable V2 RGB LED connector (JARGB_V2) 1x TPM pin header(Support TPM 2.0) 4x USB 2.0 ports 2x USB 5Gbps Type A ports 1x USB 5Gbps Type C ports |




