MSI PRO B860M-E DDR5 LGA 1851 M-ATX Motherboard
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MSI PRO B860M-E — an LGA 1851 Core Ultra board with M.2 Gen5 and a 5 Gigabit network port
A PRO-series Micro-ATX board on Intel's B860 chipset, built for Intel Core Ultra Series 2 processors on the new LGA 1851 socket. It pairs a Steel Armor PCIe 5.0 x16 slot with an M.2 Gen5 x4 socket at 128 Gb/s, a second M.2 at Gen4, and — unusually for this tier — a 5 Gigabit LAN port rather than the usual 1G or 2.5G.
Board Map
Every connector, located before you unbox
LGA 1851 CPU socket — dead centre
The silkscreen reads PRO B860M-E. This is the LGA 1851 socket for Intel Core Ultra Series 2 processors — a physically new socket, so an older LGA 1700 chip will not fit here.
Direct 6 Phase P-PAK VRM — top and left of the socket
MSI's Direct 6 Phase power design feeds the socket through a dedicated 8-pin connector at the top-left corner. The board's own silkscreen beside the memory reads CORE BOOST and MEMORY BOOST.
2 × DDR5 DIMM slots — right of the socket
Two SMT-mounted DDR5 slots. Two rather than four is a deliberate trade: a single module per channel is the configuration that reaches the highest validated speeds, up to 9066+ MT/s by overclocking.
PCIe 5.0 x16 with Steel Armor — mid-board
The long reinforced slot is a PCIe 5.0 x16 socket at 128 GB/s, wrapped in MSI Steel Armor with extra solder anchor points to carry the weight of a heavy graphics card.
M.2 Gen5 x4 socket — above the graphics slot
The primary M.2 runs at PCIe Gen5 x4, 128 Gb/s — double the bandwidth of a Gen4 socket. This is the headline storage feature and the reason the box carries a Lightning Gen 5 badge.
M.2 Gen4 x4 socket — lower board
A second M.2 socket runs at PCIe Gen4 x4, 64 Gb/s, so a fast Gen5 boot drive and a large Gen4 library drive can both be fitted.
PCIe x1 slot and chipset heatsink — lower left and centre
A short expansion slot sits clear of the graphics card cooler, and the finned silver block below the x16 slot is the passive chipset heatsink — no chipset fan to fail.
24-pin ATX, front headers and SATA — right and bottom edges
The 24-pin main power connector sits on the right edge beside the memory. Along the bottom run the front-panel USB headers, audio and system panel connectors, with the SATA ports on the lower right.
Closer Look
A detail shot from the board's I/O side
Power Delivery & Thermals
What feeds the socket, and what keeps it steadyDirect 6 Phase P-PAK VRM
A direct six-phase design in MSI's P-PAK packaging, fed by a dedicated 8-pin connector. Matched to the locked and mid-tier Core Ultra parts this board is built around rather than a maximum-power flagship.
Flash BIOS Button
The small button on the rear panel flashes a new BIOS from a USB stick with no CPU, no memory and no graphics card installed. On a brand-new socket like LGA 1851, that is genuinely useful insurance.
Passive chipset cooling with AI fan control
The B860 chipset runs under a passive finned block — no chipset fan to fail. System fan duty is set automatically from live temperature rather than a fixed curve.
Memory Boost layout
The DDR5 slots are SMT-mounted with an isolated memory circuit, which is what allows the validated 9066+ MT/s overclock ceiling on a single module per channel.
Lane Map
Interface speed rating & capability relative to modern motherboard standardsRear I/O Bay
Exactly what appears on the back of your case
Will It Fit Your Build?
Check these before you add to cartProcessor
Intel Core Ultra Series 2 on the LGA 1851 socket. This is a current-generation platform, not an LGA 1700 upgrade path.
Memory
DDR5 only — 2 slots, dual channel, validated to 9066+ MT/s by overclocking. DDR4 will not fit.
Storage
M.2 Gen5 x4 (128 Gb/s) plus M.2 Gen4 x4 (64 Gb/s), with SATA ports for bulk drives.
Graphics card
PCIe 5.0 x16 Steel Armor slot at 128 GB/s, reinforced for heavy cards.
Networking
5 Gigabit LAN — twice the throughput of the 2.5G ports common at this price, and five times a standard gigabit port.
Case
Micro-ATX board — fits any Micro-ATX, Mid-Tower or Full-Tower ATX chassis.
Two memory slots, not four
Populating both slots ends the upgrade path — plan the capacity you want up front. The trade buys the higher validated memory speed.
No onboard Wi-Fi
Wired only. The PCIe x1 slot is free for a Wi-Fi card, or use a USB adapter.
Full Specification Sheet
MSI PRO B860M-E DDR5| CPU Socket | Intel LGA 1851 |
| CPU Support | Intel Core Ultra Processors (Series 2) |
| Chipset | Intel B860 |
| Form Factor | Micro-ATX |
| Power Design | Direct 6 Phase (P-PAK) |
| Memory Slots | 2 × DDR5 DIMM (SMT), dual channel |
| Memory Speed | Up to 9066+ MT/s (O.C.), 1DPC 1R |
| Graphics Slot | 1 × PCIe 5.0 x16 (SMT) with Steel Armor · 128 GB/s |
| Expansion Slot | 1 × PCIe x1 |
| M.2 Storage | 1 × M.2 Gen5 x4 (128 Gb/s) · 1 × M.2 Gen4 x4 (64 Gb/s) |
| Rear Video Out | 1 × DisplayPort · 1 × HDMI |
| Rear USB | 2 × USB 5 Gb/s Type-A · 4 × USB 2.0 Type-A |
| Networking | 5 Gbps LAN (no Wi-Fi / Bluetooth) |
| Audio | 7.1-channel HD Audio with Audio Boost |
| BIOS Recovery | Flash BIOS Button on the rear panel |
| Cooling | Passive chipset heatsink with AI-driven system fan control |
| MSI Technologies | Core Boost · Memory Boost · Lightning Gen 5 · Steel Armor · Audio Boost |
| Warranty | Official local warranty |
