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Product Overview

The Asus PRIME B860M-A-CSM is a micro ATX motherboard built on the Intel B860 chipset for LGA 1851 processors from the Intel Core Ultra (Series 2) range. It has four DDR5 DIMM slots supporting up to 256 GB of memory, with speeds of up to DDR5-8400+ (OC) listed. For storage it offers two M.2 slots, one running at PCIe 5.0 and one at PCIe 4.0, plus four SATA III ports.

This board suits compact and mid-sized Intel Core Ultra builds where fast NVMe storage and plenty of ports matter more than Wi-Fi, as there is no wireless module onboard. It includes 2.5 Gb Ethernet, 7.1-channel Realtek audio, HDMI and two DisplayPort outputs (usable with a CPU that has integrated graphics), and a USB-C 3.2 Gen 2×2 port at 20 Gbit/s. Six 4-pin PWM fan headers and four RGB headers cover cooling and lighting. A BIOS update may be needed for the newest processors.

Specification

• Manufacturer: Asus
• Model: PRIME B860M-A-CSM
• MPN: 90MB1K00-M0EAYC
• EAN: 4711387819869
• CPU socket: LGA 1851 (Socket V1)
• Chipset: Intel B860
• Supported processors: Intel Core Ultra 3, 5, 7 and 9 (Series 2, Arrow Lake)
• Form factor: micro ATX
• Memory: 4x DDR5 DIMM, dual-channel, up to 256 GB, up to DDR5-8400+ (OC), non-ECC
• M.2 slots: 2x M.2 (M key): Slot 1 PCIe 5.0, Slot 2 PCIe 4.0, 42-80 mm
• SATA: 4x SATA III, RAID 0/1/5/10
• Expansion slots: 1x PCIe 4.0 x16, 1x PCIe x16 (x4 lanes), 1x PCIe 4.0 x1
• Rear USB: 1x USB-C 3.2 Gen 2×2, 1x USB-A 3.2 Gen 2, 2x USB-A 3.2 Gen 1, 4x USB-A 2.0
• Video outputs: 1x HDMI, 2x DisplayPort (requires CPU with integrated graphics)
• Networking: Realtek 2.5 Gb Ethernet, no Wi-Fi
• Audio: Realtek 7.1 surround sound
• Fan and RGB headers: 6x 4-pin PWM fan, 3x addressable RGB, 1x RGB (AURA Sync)
• Dimensions (W x D): 244 x 244 mm
• Weight: 815 g

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