ASRock B860M Pro-A LGA1851 Micro-ATX Motherboard – DDR5 up to 8666+ (OC), 256GB Max Memory, PCIe 5.0 x16, 3x M.2 (1x PCIe 5.0), USB-C 20Gbps, 2.5GbE LAN | 90-MXBRR0-A0UAYZ

Stable Power & Efficient Performance

Designed for Intel Core Ultra Series 2 processors on the LGA1851 socket, the B860M Pro-A features a 10+1+1+1+1 power-phase design with Dr.MOS for VCore, GT and SA. This integrated power-stage solution supports smooth power delivery and improved thermal performance, while the six-layer PCB provides stable signal traces and efficient power distribution. High-density 8-pin and 4-pin CPU power connectors and an optimised aluminium heatsink further support dependable operation during gaming and productivity workloads.

High-Speed DDR5 Memory

Four DDR5 DIMM slots support dual-channel memory at speeds of up to 8666+ MT/s when overclocked, with a maximum system capacity of 256GB. CUDIMM support and Intel XMP 3.0 compatibility make it easier to configure supported high-speed memory kits, while AMD EXPO support adds further memory compatibility. Actual memory speeds depend on the processor, installed modules and memory configuration.

PCIe 5.0 Graphics & Blazing M.2 Storage

A reinforced PCIe 5.0 x16 steel slot provides a secure foundation for modern graphics cards, with extra anchor points, a stronger latch and stable signal transmission. The Blazing M.2 socket supports PCIe Gen5x4 SSDs with bandwidth of up to 128Gb/s, while two additional Hyper M.2 sockets support PCIe Gen4x4 drives with up to 64Gb/s bandwidth. Four SATA 6Gb/s connectors provide additional storage expansion, with RAID 0, RAID 1, RAID 5 and RAID 10 support for compatible SATA configurations.

Fast Networking & Abundant USB

Dragon RTL8125BG 2.5 Gigabit Ethernet delivers up to 2.5 times the bandwidth of standard Gigabit Ethernet, with Dragon LAN software providing traffic prioritisation, bandwidth control and network monitoring. The rear USB 3.2 Gen2x2 Type-C port supports transfers of up to 20Gbps, joined by three rear USB 3.2 Gen1 and two USB 2.0 ports. Internal headers add a front USB Type-C connection, two USB 3.2 Gen1 ports and four USB 2.0 ports. An M.2 Key E socket also supports an optional 2230 Wi-Fi/Bluetooth or Intel CNVi/CNVio2 module.

RGB, Cooling & DIY-Friendly Design

One RGB LED header and three addressable RGB headers support compatible lighting through ASRock Polychrome Sync and SignalRGB. Two CPU fan connectors, three chassis fan connectors and a dedicated AIO pump connector provide flexible cooling control with Smart Fan Speed Control. HDMI and DisplayPort outputs support compatible processors with integrated graphics, while BIOS Flashback, Auto Driver Installer and Post Status Checker simplify firmware updates, driver installation and system troubleshooting.

Key Features

• Intel LGA1851 socket for Intel Core Ultra Series 2 processors
• Intel B860 chipset · 6-layer PCB
• 10+1+1+1+1 power phases with Dr.MOS for VCore, GT and SA
• 4x DDR5 DIMM, dual channel, max 256GB, up to 8666+ MT/s (OC)
• CUDIMM support · Intel XMP 3.0 · AMD EXPO
• 1x reinforced PCIe 5.0 x16 + 1x PCIe 4.0 x4
• 1x Blazing M.2 PCIe Gen5x4 with up to 128Gb/s bandwidth
• 2x Hyper M.2 PCIe Gen4x4 with up to 64Gb/s bandwidth
• 4x SATA 6Gb/s · SATA RAID 0, RAID 1, RAID 5 and RAID 10
• Rear USB 3.2 Gen2x2 Type-C with up to 20Gbps
• Front USB 3.2 Gen1 Type-C header + additional front USB headers
• Dragon RTL8125BG 2.5 Gigabit Ethernet with network management software
• M.2 Key E socket for optional Wi-Fi/Bluetooth or Intel CNVi/CNVio2 module
• Realtek ALC897 7.1-channel HD audio
• Polychrome RGB and SignalRGB with 1x RGB + 3x addressable LED headers
• BIOS Flashback, Auto Driver Installer and Post Status Checker

Spec Sheet

Perfect For

• Compact Intel Core Ultra gaming and productivity builds
• High-speed storage setups using PCIe 5.0 and PCIe 4.0 NVMe SSDs
• Home and office PCs needing 2.5G Ethernet and 20Gbps USB-C
• Micro-ATX systems with custom cooling and synchronised RGB lighting

What’s Included

• ASRock B860M Pro-A motherboard
• 1x I/O shield
• 2x SATA data cables
• 1x M.2 socket screw

Compact performance with modern connectivity — the ASRock B860M Pro-A combines DDR5 overclocking, PCIe 5.0 graphics and storage, three M.2 sockets, 20Gbps USB-C and 2.5G networking for a versatile Intel Core Ultra build.