MSI PRO B860M-A WIFI (SOCKET LGA1851 & INTEL B860 CHIPSET)

Model: MSI PRO B860M-A WIFI (Part Number: 911-7E42-008)

CPU: Supports Intel® Core™ Ultra Processors (Series 2) for Socket LGA1851.

Chipset: Intel® B860 Chipset

Memory: 4 x DDR5 DIMM slots, Max capacity up to 256GB; Dual-Controller Dual-Channel Memory Architecture; Supports non-ECC, un-buffered memory; Supports CUDIMM modules; Supports Intel® Extreme Memory Profile (XMP) 3.0. Supported Overclocked (O.C.) frequencies: DDR5 8800+(O.C.) / 8600(O.C.) to 6400(O.C.) MT/s, and native 6400 / 5600 / 4800 MT/s JEDEC profiles.

Graphic: Integrated Graphics Processor support depends on the installed CPU with onboard Intel® Graphics. Offers cutting-edge multi-VGA output options across rear interfaces:

• 1 x Thunderbolt™ 4 (Type-C): Supports DisplayPort 2.1 with UHBR20 protocol, maximum resolution of 4K @ 120Hz / 8K @ 60Hz.

• 1 x HDMI 2.1 port: With HDR support, maximum resolution of 4K @ 60Hz.

• 1 x DisplayPort 1.4 port: Maximum resolution of 4K @ 60Hz.

  Expansion Slots: * 1 x PCI Express x16 slot (PCI_E1, directly managed by CPU lanes): Supports up to PCIe 5.0 x16 operation.

• 1 x PCI Express x16 slot (PCI_E2, managed by Intel B860 Chipset lanes): Supports up to PCIe 4.0 x4 operation.

• 2 x PCI Express 4.0 x1 slots (Managed by Intel B860 Chipset lanes).

  Multi-GPU Support: Not Supported.

Storage: Intel® B860 Chipset high-speed storage architecture:

• 1 x M.2 slot (M2_1, directly from CPU): Supports up to PCIe 5.0 x4 speed; supports type 2242/2260/2280 storage devices.

• 1 x M.2 slot (M2_2, from Chipset): Supports up to PCIe 4.0 x4 speed; supports type 2280/2260 storage devices.

• 1 x M.2 slot (M2_3, from Chipset): Supports up to PCIe 4.0 x2 speed; supports type 2280 storage devices.

• 4 x SATA 6Gb/s ports (From B860 Chipset).

• Note: Supports RAID 0, RAID 1, RAID 5, and RAID 10 configurations for legacy SATA storage drives. LAN: 1 x Realtek® 5G Super-Speed LAN Controller (5Gbps/2.5Gbps/1Gbps).

  Audio: 7.1-Channel High Definition Audio Boost layout engine.

  USB Ports: Advanced Next-Gen USB configuration managed by CPU, Chipset, and onboard Hub controllers:

• Rear Panel I/O: 1 x Thunderbolt™ 4 40Gbps Type-C port, 1 x USB 10Gbps Type-A port, 3 x USB 5Gbps (2 Type-A + 1 Type-C) ports, 2 x USB 2.0 ports.

• Internal Headers: 1 x USB 10Gbps Type-C front panel header, 2 x USB 5Gbps headers (Supports an additional 4 Type-A front panel ports via Realtek Hub), 2 x USB 2.0 headers (Supports 4 additional Type-A ports).

Software Features

MSI Exclusive Software

• MSI Center: A centralized AI PC ecosystem hub uniting performance profiling, Smart User Scenarios, Hardware Telemetry Monitoring, True Color, Live Update, and Mystic Light RGB sync controls.

• Frozr AI Cooling: Smart algorithmic fan management application that tracks internal system telemetry to adjust cooling fan curves automatically.

UEFI BIOS

• MSI Click BIOS (Graphical User Interface environment optimized for Intel Core Ultra configurations).

• 1 x 256 Mbit Flash ROM layout.

• Features simplified EZ-Mode dashboards alongside Advanced-Mode parameter sub-menus.

Manufacturer Special Features

• Intel® Wi-Fi 7 Module: Pre-installed wireless module supporting 2.4GHz / 5GHz / 6GHz bands, 320MHz channel widths, Multi-Link Operation (MLO), 4K-QAM, and Bluetooth® 5.4 to deliver speeds up to 5.8Gbps.

• EZ DIY Features: Includes tool-less EZ M.2 Shield Frozr II thermal plates, a single-finger EZ PCIe Clip II release system for cramped graphics slot extraction, and an EZ Antenna mechanism.

• 12+1+1+1 Duet Rail Power System (DRPS): High-amperage VRM architecture backed by digital PWM ICs and P-PAK mosfets for stable power routing.

• PCIe Supplemental Power: Built-in onboard extra power connection to supply clean, high-amperage electricity to multiple add-in expansion lines.

• Steel Armor PCIe Slot: Heavy-duty reinforced structural metal casing anchored firmly with extra solder points to prevent mechanical sag.

Back I/O Ports

• 1 x PS/2 Keyboard/Mouse combo port

• 1 x DisplayPort 1.4

• 1 x HDMI 2.1 port

• 1 x Thunderbolt™ 4 40Gbps Type-C port

• 1 x USB 10Gbps Type-A port (Red)

• 2 x USB 5Gbps Type-A ports (Blue)

• 1 x USB 5Gbps Type-C port

• 2 x USB 2.0 ports (Black)

• 1 x RJ-45 5Gbps Ultra-LAN port

• 2 x Wi-Fi 7 EZ Antenna connectors

• 3 x Audio jacks (Line-In, Line-Out, Microphone-In)

Internal I/O Ports

• 1 x 24-pin ATX main power connector

• 1 x 8-pin ATX 12V power connector

• 1 x 4-pin ATX 12V power connector

• 1 x PCIe supplemental power connector

• 1 x 4-pin CPU fan header

• 1 x 4-pin Water Pump fan header (Supports up to 3A output)

• 4 x 4-pin System fan headers

• 2 x 3-pin ARGB LED connectors (Addressable Gen2 RGB)

• 2 x 4-pin RGB LED connectors

• 3 x M.2 slots (Key M)

• 4 x SATA 6Gb/s connectors

• 1 x Front panel audio connector (AAFP)

• 2 x System panel cluster connectors (JFP1 / JFP2)

• 1 x Chassis intrusion connector

• 1 x Serial port (COM) header

• 1 x Clear CMOS jumper

• 1 x TPM 2.0 module pin header

• 1 x USB 10Gbps Type-C front panel header

• 2 x USB 5Gbps headers (Supports 4 additional Type-A ports)

• 2 x USB 2.0 headers (Supports 4 additional Type-A ports)

Additional Product Information

Accessories: * 2 x Wi-Fi Antennas (EZ-plug design)

• 1 x Pre-installed I/O Shield backplate

• M.2 Clip/Anchor packs for toolless NVMe mounting

• 2 x SATA 6Gb/s data cables

• 1 x Quick Installation Guide

BIOS: 256 Mb Flash ROM, UEFI AMI BIOS, ACPI 6.4, SM BIOS 3.5 compliant.

Manageability: WOL by Intel/Realtek PME, PXE remote boot capabilities.

Operating System: Support for Windows® 11 (64-bit).

Form Factor: Micro-ATX Form Factor; 9.6 inches x 9.6 inches (24.4 cm x 24.4 cm); 6-layer server-grade PCB design with 2oz thickened copper paths.

Comprehensive Architecture & Performance Deep-Dive

Next-Generation Platform Topology: LGA1851 & Intel B860

The architectural layout of the MSI PRO B860M-A WIFI shifts away from traditional system bus designs to accommodate the high-density tile architecture of Intel Core Ultra (Series 2) processors. This motherboard moves to the newer LGA1851 socket arrangement, changing its signal pathways to maximize direct CPU-to-peripheral interconnect efficiency without needing extra routing bridges.

The motherboard utilizes a 6-layer server-grade PCB layout with 2oz thickened copper traces. This structure handles high-frequency memory tracks and PCIe signals while controlling electromagnetic noise. The processor package directly manages high-speed components, routing lines straight to the top M.2 NVMe slot and the primary PCIe graphics slot. This arrangement leaves the Intel B860 chipset to handle secondary storage links, native USB hub matrices, and advanced wireless communication links via a wide DMI 4.0 data stream.

DDR5 CUDIMM Memory Signaling and Architecture

The memory subsystem introduces support for advanced Clocked Unbuffered DIMM (CUDIMM) modules alongside standard DDR5 non-ECC options. By using an onboard clock driver circuit directly on the module, signal timing remains stable over long-term processing runs.

The traces follow an isolated Memory Boost layout completely cut off from edge electrical interference. When matching slots are populated to open up dual-controller pathways, the system runs smoothly past 8800+ MT/s under custom Intel XMP 3.0 overclocking profiles. This parallel signaling routing provides massive throughput to handle data-heavy AI operations, rendering pipelines, or high-end virtualization configurations.

Multi-Tier Generation 5 Connectivity and Tool-Less Assembly

The board provides an unthrottled PCIe 5.0 x16 graphics interface out of the primary slot, maintaining full 128GB/s bandwidth to feed modern professional graphics cards. To manage large expansion networks, MSI adds a Supplemental PCIe Power connector directly on the bottom edge of the PCB. This port supplies clean, high-amperage current to multi-card setups or high-speed data capture cards, protecting the main 24-pin ATX connector from over-current heating.

The storage layout features three distinct M.2 slots, with the primary socket running on a direct PCIe 5.0 x4 track straight from the CPU. To simplify assembly, MSI includes its toolless EZ DIY design ecosystem. This setup features the EZ M.2 Shield Frozr II heatsink and the EZ PCIe Clip II release arm, allowing builders to install or remove components quickly without standard mounting screws, even in tight case setups.

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