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Green mATX motherboard with silver heatsinks, black PCB, four DDR5 slots, reinforced PCIe x16 slot, dual M.2 shields

ASUS

ASUS PRIME B860M-A Intel B860 LGA 1851 mATX motherboard

SKU CH-XDFT-801P5

mATX board for Intel Core Ultra processors with DDR5 support, dual M.2 slots, PCIe 5.0 graphics slot, 20Gbps USB-C and 2.5Gb Ethernet

  • CPU Socket TypeLGA 1851
  • ChipsetIntel B860
  • Supports 12th-14th Gen and Intel Core Ultra processors via LGA 1700 socket
  • DDR5-7600+ speeds enabled by AEMP 3.0 with DIMM FIT stability
  • PCIe 5.0 x16 SafeSlot and dual M.2 slots up to 128Gbps bandwidth
  • Rear USB 20Gbps Type-C port plus Realtek 2.5Gb Ethernet with Digi+ VRM control
  • Pre-mounted I/O shield, three Gen2 ARGB headers with Aura Sync, six-layer PCB

Compact Intel B860 board for Core Ultra builds

The ASUS PRIME B860M-A is an mATX motherboard built around the Intel B860 chipset and LGA 1851 socket. It supports 12th to 14th Generation Intel Core and Core Ultra processors. A 7+1+1+1 phase 80A DrMOS VRM with a ProCool 8-pin connector delivers stable power for daily workloads.

Suits small-form-factor DDR5 systems.

This board fits builders who want a compact platform with DDR5 memory support up to 7600 MT/s via AEMP 3.0 and DIMM FIT. It offers dual M.2 slots, a single PCIe 5.0 x16 SafeSlot, and rear 20Gbps USB-C. Users needing multiple full-length graphics cards or extensive legacy I/O should consider a larger ATX alternative.

PCIe 5.0 x16 SafeSlot decides graphics bandwidth

The single PCIe 5.0 x16 SafeSlot provides the primary expansion path for modern graphics cards. Storage connects through one PCIe 5.0 x4 M.2 slot at 128Gbps and one PCIe 4.0 x4 M.2 slot. Realtek 2.5Gb Ethernet and SATA 6Gbps round out the connectivity.

Highlights

  • Supports 12th-14th Gen and Intel Core Ultra processors via LGA 1700 socket
  • DDR5-7600+ speeds enabled by AEMP 3.0 with DIMM FIT stability
  • PCIe 5.0 x16 SafeSlot and dual M.2 slots up to 128Gbps bandwidth
  • Rear USB 20Gbps Type-C port plus Realtek 2.5Gb Ethernet with Digi+ VRM control
  • Pre-mounted I/O shield, three Gen2 ARGB headers with Aura Sync, six-layer PCB

Specifications

BrandASUS
ModelPRIME B860M-A
CPU Socket TypeLGA 1851
ChipsetIntel B860

Questions about this item

Should I choose the PCIe 5.0 x4 M.2 slot or the PCIe 4.0 x4 slot for my fastest drive?

Install the fastest drive in the PCIe 5.0 x4 slot rated at 128Gbps. The second slot runs at PCIe 4.0 x4 and is better suited for a secondary drive.

What does DDR5-7600+ mean once the board is built and running?

AEMP 3.0 can automatically push compatible DDR5 modules to 7600 MT/s or higher. DIMM FIT then validates stability so the memory runs reliably at those speeds.

What does the rear USB 20Gbps Type-C port actually cap at in practice?

The port is rated for 20Gbps USB signalling. Real-world throughput depends on the attached device and cable, but the interface itself does not exceed 20Gbps.

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